Document:

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                                                                   EXHIBIT 10.35

                      SYSTEM EQUIPMENT PURCHASE AGREEMENT
                      -----------------------------------

     This System Equipment Purchase Agreement is made and is effective as of the
28/th/ day of August, 2000 (the "Effective Date"), by and between Cricket
                               --------------
Communications, Inc. a Delaware corporation (the "Owner"), and Nortel Networks
                                                  -----
Inc., a Delaware corporation (the "Vendor").
                                   ------

                                   RECITALS:
                                   --------

     A.  WHEREAS, Owner desires to purchase PCS systems pursuant to this
Contract; and

     B.  WHEREAS, Vendor desires to provide such PCS systems to Owner, as
described in Exhibit A02, including, but not limited to, Vendor's obligation to
manufacture, engineer, equip, integrate, install, test and provide technical
assistance for said PCS systems in accordance with the terms and conditions set
forth herein.

     NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth in this Contract, Owner and Vendor hereby agree as follows:

     SECTION 1.  DEFINITIONS

     1.1  Definitions.  In addition to the terms listed below, certain
          -----------
additional terms are defined elsewhere in this System Equipment Purchase
Agreement and in the Exhibits, and all definitions are subject to the provisions
of subsection 1.2 hereof. As used in this Contract, the following terms have the
following meanings:

     "Affiliate" means any entity that either (i) is listed as an Affiliate in
      ---------
Exhibit V; or (ii) that, subject to the evaluation criteria listed below, Vendor
has consented to add as an Affiliate; or (iii) is greater than fifty percent
(50%) owned, either directly or indirectly, by Owner or is greater than fifty
percent owned directly or indirectly by a parent company of Owner that maintains
a greater than fifty percent (50%) direct or indirect ownership in Owner;
provided that, Vendor will have a reasonable opportunity to review and approve
any proposed Affiliate under (ii) (such approval not to be unreasonably
withheld) based upon: (a) reasonable credit criteria; (b) whether the proposed
Affiliate has not in the past materially breached prior agreements with the
Vendor or its affiliates; (c) whether the proposed Affiliate is, at the time of
such determination, neither a direct or indirect competitor of the Vendor or its
affiliates nor owned, in whole or in part, by a direct or indirect competitor of
Vendor; and (d) whether the proposed Affiliate is not, at the time of such
determination, otherwise engaged with the Vendor or its affiliates in an
agreement for the purchase and/or supply of wireless technology.  In the event
an Affiliate no longer meets the criteria set forth in subsections (ii) or (iii)
herein, as applicable, Vendor may, at its discretion, terminate any and all of

CERTAIN MATERIAL (INDICATED BY AN ASTERISK) HAS BEEN OMITTED FROM THIS DOCUMENT
PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED MATERIAL HAS BEEN
FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
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such Affiliate's rights under this Contract; provided that, Vendor has provided
Owner ten (10) day advance written notice of its intent to terminate such
Affiliate's rights.

     "Applicable Laws" means, as to any Person, the certificate of incorporation
      ---------------
and by-laws or other organizational or governing documents of such Person, all
U.S. or foreign laws, treaties, ordinances, judgments, decrees, injunctions,
writs, orders and stipulations of any court, arbitrator or governmental agency
or authority and statutes, rules, regulations, orders and interpretations
thereof of any federal, state, provincial, county, municipal, regional,
environmental or other Governmental Entity, instrumentality, agency, authority,
court or other body (i) applicable to or binding upon such Person or any of its
property or to which such Person or any of its property is subject or (ii)
having jurisdiction over all or any part of a System or the Work to be performed
pursuant to the terms of this Contract.

     "Applicable Permits" means any waiver, exemption, zoning, building,
      ------------------
variance, franchise, permit, authorization, approval, license or similar order
of or from any country, federal, state, provincial, county, municipal, regional,
environmental or other Governmental Entity, instrumentality, agency, authority,
court or other body having jurisdiction over all or any part of a System or the
Work to be performed pursuant to the terms of this Contract.

     "Backwards Compatible" or "Backwards Compatibility" means (i) with respect
      --------------------      -----------------------
to new Software Maintenance Releases, Software Upgrades, Software Combined
Releases and Software Enhancements, the ability of each of the [*] prior older
versions of Software to remain fully functional in accordance with and up to the
performance levels to which each was performing immediately prior to the
integration with the new Software Maintenance Release, Software Upgrade,
Software Combined Releases and/or Software Enhancement, and the ability of such
new Software Maintenance Release, Software Upgrade, Software Combined Release
and/or Software Enhancement to interoperate and be compatible with all such
functionality of such prior Software versions and with all existing in-service
Vendor provided Products already installed in the System; (ii) with respect to
all Equipment Upgrades, and Equipment Combined Releases to the extent of that
portion of the Equipment Combined Release which is the Equipment Upgrade or the
use of which by Owner is not optional without losing the benefit of the
Equipment Upgrade (for purposes of this Contract, a "New Equipment Release"
means collectively the Equipment Upgrade and such non-optional portion of the
Equipment Combined Release), the ability of the existing infrastructure to
remain fully functional in accordance with and up to the performance levels to
which it was performing immediately prior to the integration with the New
Equipment Release, and the ability of the New Equipment Release to interoperate
and be fully compatible with all such functionality of such existing
infrastructure and (iii) with respect to each of Software Combined Releases (but
only to that portion of such Software Combined Release that is considered a
Software Upgrade), Software Maintenance Releases, Software Upgrades, and New
Equipment Releases, the ability of such Products to comply with the existing
interfaces to other third party equipment already deployed in the System and
with respect to which Vendor is already in compliance prior to the introduction
of the Software

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

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Combined Release (but only to that portion of such Software Combined Release
that is considered a Software Upgrade), Software Maintenance Releases, Software
Upgrades, and New Equipment Releases.

     "Base Station ("BTS")" means the radio Products that handle PCS radio
      --------------------
traffic in a designated cell. The Base Station includes all amplification,
modulation, synchronization and other circuitry required to process a radio
signal.

     "Base Station Controller ("BSC")" means the controller Products that
      -------------------------------
control the radio/cellsite equipment.

     "beta testing" means pre-launch testing conducted by Owner in respect of
      ------------
which no payment from customers is made to Owner for the services provided in
connection therewith.

     "Business Day" means any day of the year other than a Saturday, Sunday or a
      ------------
United States Federal holiday.

     "Capacity Guarantee" is defined in Section 14.2.7.
      ------------------

     "Certificate of Final Acceptance" is defined in subsection 10.1(f).
      -------------------------------

     "Certificate of Substantial Completion" is defined in subsection 10.1(d).
      -------------------------------------

     "Change Orders" is defined in subsection 11.1.
      -------------

     "Claim" is defined in subsection 15.2.
      -----

     "Claim Notice" is defined in subsection 15.2.
      ------------

     "Compliance Warranty" is defined in Section 8.3.
      -------------------

     "Contract" means this System Equipment Purchase Agreement, together with
      --------
all Exhibits, Schedules and Specifications hereto, together with all amendments,
modifications and supplements.

     "Contract Term" means the period commencing on the Effective Date and
      -------------
ending three (3) years therefrom, unless terminated earlier in accordance with
the terms and conditions hereof, or unless extended by the mutual written
consent of the parties hereto.

     "Defects and Deficiencies", "Defects or Deficiencies" or "Defective" means
      ------------------------    -----------------------      ---------
any one or a combination of the following items or other items of a
substantially similar nature:

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          (a)  when used with respect to the performance of Services, that such
     Services are not provided in a careful and workmanlike manner and in
     accordance with the Specifications, using material which is free from
     defects;

          (b)  when used with respect to structures, materials or Products, that
     such items (i) are not new and of good quality and free from defects in
     materials and workmanship, or (ii) do not conform to the Specifications, or
     (iii) with respect to Software, that such Software does not provide the
     functions and features described in the Specifications; provided, however,
     that with respect to materials and Products that are replaced or repaired
     in accordance with any warranty or maintenance provisions of this Contract,
     such items may be like-new, refurbished, remanufactured or reconditioned;
     or

          (c)  with respect to all other Work, that the same (i) are not free of
     defects in workmanship and materials, or (ii) do not conform to the
     Specifications.

          "Discontinued Products" is defined in subsection 12.1.
           ---------------------

          "Documentation" means the Operating Manuals, the Maintenance and
           -------------
Instruction Manuals, the Training Manuals, the "as-built" Site parameters and
all other documentation necessary for the operation of the System, any
Expansions and/or any material part thereof.

          "Dollars" or "U.S. $" or "$" means the lawful currency of the United
           -------      ------      -
States of America.

          "EFT" is defined in Section 5.6.
           ---

          "Equipment" means all equipment, hardware and other items of personal
           ---------
property (including, without limitation, any Documentation furnished hereunder
in respect thereof) which are required to be furnished by Vendor in accordance
with the terms and conditions of this Contract, including repair and replacement
parts.

          "Equipment Combined Release" is defined in subsection 14.2.1.
           --------------------------

          "Equipment Enhancements" means modifications or improvements made to
           ----------------------
the Equipment that improve the performance, capacity and capability of such
Equipment.  An Equipment Enhancement may include an Equipment Upgrade.

          "Equipment Upgrade" means a change or modification in any delivered
           -----------------
Equipment which fixes or otherwise corrects faults, design shortcomings or
shortcomings in meeting the Specifications, required to correct defects of a
type that result in inoperative conditions, unsatisfactory operating conditions,
or which is recommended to enhance safety.

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     "Expansions" means any additional Products ordered by Owner from Vendor,
      ----------
which may include growth to existing Systems and additional Products, Services
and Systems.

     "FCC" means the Federal Communications Commission.
      ---

     "Final Acceptance" means, with respect to any System, date Owner signs the
      ----------------
Certificate of Final Acceptance.

     "Fit" means physical size or mounting arrangement (for example, electrical
      ---
or mechanical connections).

     "Force Majeure" is defined in Section 17.
      -------------

     "Form" means physical shape.
      ----

     "Function" means Product features and performance, or with respect to other
      --------
items, the features and performance of such items.

     "Governmental Entity" means the United States federal government or any
      -------------------
state or other political subdivision thereof and any entity exercising
executive, legislative, judicial, regulatory or administrative functions of or
pertaining to government.

     "Guaranteed Substantial Completion Date" means, with respect to a System,
      --------------------------------------
the date by which Substantial Completion must be achieved by Vendor. The
Guaranteed Substantial Completion Date is determined based on the Site that is
identified by Owner in writing to be the last Site to be included in the
definition of such System (the "Last Site"). Owner agrees to provide Vendor with
a rolling sixty (60) day forecast for the Sites to be included in each System,
and Owner further agrees to provide weekly progress reports of Owner's site
acquisition activities for each Site related to such System. In the event the
Purchase Order(s) issued for construction of such Sites by Vendor exceeds the
aforementioned forecasted amount by more than twenty percent (20%), Vendor shall
be granted an equitable extension of the applicable Guaranteed Substantial
Completion Date. In the event Owner materially impedes Vendor's ability to
complete the build out of such System in accordance with the applicable project
schedule, Vendor may, at its discretion, issue an invoice and require Owner to
pay, in accordance with Section 5.3(b), the balance of 100% of the price of such
related Products and Services provided by Vendor; provided that, Vendor provided
notice to Owner of such impedance and Owner failed to commence to cure such
impedance within ten (10) days from Vendor's notice thereof. If Owner has issued
Purchase Orders related to a System that require: (i) Vendor to perform Site
Construction Services for certain of the Sites of such System, and (ii) Owner to
perform Site Construction activities for certain of the Sites of such System,
the Guaranteed Substantial Completion Date shall be sixty (60) days from the
date of the Last Site Purchase Order as provided for above.

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          If Owner has performed the Site Construction activities with respect
to the Last Site, the Guaranteed Substantial Completion Date shall be the date
which is thirty (30) calendar days after the date Owner issues a Site
Construction Substantial Completion Certificate with respect to the Last Site to
Vendor; provided that in all of the foregoing circumstances, the Guaranteed
Substantial Completion Date shall be delayed to a date mutually acceptable to
Vendor and Owner, acting reasonably, in the event that:

     i.   Owner has not satisfied its obligations, if any, for Site Construction
          for the installation of the Switch by at least twelve (12) weeks prior
          to the Guaranteed Substantial Completion Date (in this case the
          parties agree that the period of delay shall be equal to the number of
          days that Owner's Site Construction obligations, if any, are delayed
          beyond such date which is twelve (12) weeks prior to the Guaranteed
          Substantial Completion Date); or

     ii.  Owner has not satisfied its obligation(s) with regard to Site
          Construction for each applicable Site by the date that has been agreed
          upon for completion of such obligations, and the parties agree that in
          such event the period of delay shall be equal to the number of days
          that Owner's Site Construction obligations are so delayed; or

     iii. extreme weather and other unusual environmental conditions beyond
          Vendor's reasonable control delays Vendor's completion of Substantial
          Completion activities (in this case the parties agree that the period
          of delay shall be equal to the period of time associated with the
          duration of such extreme or unusual condition(s)); or

     iv.  Vendor is not provided with all necessary and reasonable access to the
          System and each Site; or

     v.   at the time Owner identifies the Last Site, more than 10% of the total
          number of Sites for the System are also identified contemporaneously
          therewith; or

     vi.  Owner fails to act in good faith to timely issue applicable Purchase
          Orders related to the System (i.e., for each Site) upon completion of
          Owner's Site Acquisition and other activities related to each such
          Site.

Owner shall also involve Vendor through all stages of the Site Acquisition
process.  In all cases, Owner shall be responsible for the provisioning of
backhaul facilities required at all Sites.  Such provisioning must be completed
prior to the start of equipment integration by Vendor at each site.

In the event Owner elects to issue Purchase Orders for Vendor to perform Site
Acquisition Services as described in Exhibit H, Owner and Vendor shall mutually
agree upon a reasonable Guaranteed Substantial Completion Date.

                                       6
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     "Hazardous Materials" means material designated as a "hazardous chemical
      -------------------
substance or mixture" by the Administrator, pursuant to Section 6 of the Toxic
Substance Control Act, a "hazardous material" as defined in the Hazardous
Materials Transportation Act (49 U.S.C. 1801, et seq.), or a "hazardous
substance as defined in the Occupational Safety and Health Act Communication
Standard (29 CFR 1910.1200).

     "In Revenue Service" or "In Revenue" means, with respect to a System, the
      ----------------------------------
commercial operation of such System, exclusive of operation for purposes of
determining compliance with this Contract or beta testing, whether or not
revenue is actually being generated.

     "Initial Period" is defined in Section 10.1(f).
      --------------

     "Initial Software Features" means those software features contained in
      -------------------------
Vendor's standard base generic software releases together with those additional
optional software features listed in Exhibit Q.

     "Installation and Integration" is defined in Exhibits L and O.
      ----------------------------

     "Intellectual Property Rights" is defined in subsection 15.2.
      ----------------------------

     "Interoperability" means the ability of the Products to operate with other
      ----------------
Products and to operate with and within a System, all in accordance with the
Specifications.

     "Liquidated Damages" is defined in subsection 16.1.
      ------------------

     "List Price" means the list prices specified in Exhibits A01 - A10 as may
      ----------
be amended from time to time.

     "Losses" means any claims, demands, suits, proceedings, causes of action,
      ------
damages, costs, expenses, liabilities, reasonable attorneys' fees, and amounts
paid in settlement.

     "Major Outage" means the cessation of operation of a System or System
      ------------
Element caused by a Defect or Deficiency of the Products, excluding OEM
Equipment (except MSC power equipment provided hereunder), attributable solely
to Vendor or Vendor's failure to timely restore the operation of the System or
System Element affected by the Major Outage in accordance with the
Specifications that has a material adverse impact on Owner's ability to operate
or maintain such System, render billings to Owner's subscribers, or that causes
a material interruption in Owner's ability to continue to furnish or offer
service functionalities and features to such subscribers. Except that on
determining if the Defect or Deficiency is attributable solely to Vendor, any
act or omission by Owner or any third party shall be disregarded if such act or
omission, pursuant to the Specifications, should not have resulted in a material
adverse effect on the System or System Element.

                                       7
<PAGE>

In addition, the following capacity and/or coverage impairment conditions shall
be considered a "Major Outage":

               (i) Any impairment caused by a Defect or Deficiency attributable
          solely to Vendor that has the effect of reducing by greater than [*]
          the number of traffic channel resources available in the System for
          access by Owner's subscribers for a period of [*] or more; provided
          that, at least [*] or more BTS's have failed causing such loss of
          coverage; and/or

               (ii)  Any impairment caused by a Defect or Deficiency
          attributable solely to Vendor that has the effect of rendering greater
          than [*] of the equipped antenna sectors in the System unable to
          process origination, termination or hand-off requests; or that reduces
          the forward channel power of more than [*] of the equipped sectors in
          the System by greater than [*]; and/or

               (iii) The persistent occurrences of an impairment referenced in
          paragraphs (i) or (ii) above which, although each occurrence falls
          below the [*] threshold, each occurrence exceeds a threshold of
          greater than [*] of the applicable metric set forth above, and the
          total number of such occurrences is greater than [*] events during the
          Initial Period; and/or

               (iv)  Notwithstanding the foregoing, the Vendor will have no
          liability pursuant to Major Outage for:

                    1.  Outages caused by a Force Majeure event other than to
                        the extent the System or System Element should have, in
                        accordance with the Specifications, been able to
                        withstand any such Force Majeure event;

                    2.  Outages resulting from a scheduled activity or event,
                        including, but not limited to, System maintenance or
                        Software or Equipment Upgrades, unless such Outage
                        extends beyond the expected downtime, as provided in the
                        Specifications applicable thereto, associated with such
                        maintenance or Upgrades;

                    3.  Outages resulting solely from Owner's or any third
                        party's (other than Vendor or any Subcontractor) failure
                        to comply with the Specifications;

                    4.  Outages resulting from the negligence or willful
                        misconduct of the Owner, or any of its employees,
                        agents,

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       8
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                        contractors, or third parties, other than Vendor
                        or any Subcontractor;

                    5.  Outages resulting from failure of equipment or software
                        not supplied by the Vendor or from the performance of
                        services not performed by the Vendor or its
                        Subcontractors, except to the extent the System or
                        Systems Element should have, in accordance with the
                        Specifications, been able to withstand any such
                        failures; or

                    6.  Outages attributable solely to the effect of Exclusion
                        Zone(s) as described in Exhibit N.

provided, however, that the foregoing definition shall only be applicable for
purposes of this Contract for the issuance of a Certificate of Final Acceptance
at the end of the Initial Period and for the calculation of Liquidated Damages.

     "Maintenance and Instruction Manuals" means the manuals listed in Exhibit R
      -----------------------------------
and prepared by Vendor and delivered to Owner pursuant to Section 9.

     "Manufacturing" means the fabrication of the Equipment.
      -------------

     "Material Adverse Effect" is defined in subsection 24.2(b).
      -----------------------

     "Milestones" means the performance milestones set forth in the Exhibits.
      ----------

     "MSC" means a Vendor engineered DMS-MTX providing switching functions.
      ---

     "Network Planning" means Work related to the design and engineering of a
      ----------------
System, including frequency clearance.

     "OEM Equipment" means (i) any items of non-Vendor equipment made available
      -------------
for sale to Owner by Vendor under this Contract that are not integrated into the
Equipment during the manufacturing process; and (ii) non-Vendor software made
available for license to Owner under this Contract that is not resident on
Vendor Equipment.

     "Operating Manuals" means the operating and configuration manuals listed in
      -----------------
Exhibit R to be prepared by Vendor and delivered to Owner pursuant to Section 9
containing detailed procedures and specifications for the operation of any
System, any Expansions and/or any part thereof including, but not limited to,
BTS manuals and BSC manuals.

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<PAGE>

     "Operator" shall mean Owner, a Related Operator, an Affiliate or any
      --------
independent contractor appointed by Owner, that is constructing or operating a
System or other PCS related facilities.

     "Optimization Services" means the RF optimization services described on
      ---------------------
Exhibit N.

     "Optional Software Features" means Software features for PCS Products
      --------------------------
available to Owner on an optional, separate fee basis.

     "Owner Indemnified Parties" is defined in Section 15.2.
      -------------------------

     "PCS" means personal communication services authorized by the Federal
      ---
Communications Commission.

     "Person" means an individual, partnership, limited partnership,
      ------
corporation, limited liability company, business trust, joint stock company,
trust, unincorporated association, joint venture, Governmental Entity or other
entity of whatever nature.

     "Products" means the collective reference to the Equipment and the Software
      --------
provided by Vendor or any Subcontractor.

     "Proprietary Information" is defined in subsection 26.18.
      -----------------------

     "Punch List" means that list prepared in conjunction with any certificate
      ----------
which contains one or more immaterial non-service-affecting items which have not
been fully completed as of the date of the accompanying certificate; provided
                                                                     --------
that such incomplete portion of the Work shall not, during its completion,
materially impair the normal daily operation of a System in accordance with the
Specifications.

     "Purchase Order" means a written notice given by Owner to Vendor in
      --------------
compliance with the provisions of this Contract specifying the Products,
Services or other items of Work that Vendor is authorized to supply or commence
in compliance with the terms of this Contract.

     "Purchase Order Date" means the date on which any Purchase Order is issued
      -------------------
by Owner in accordance with the terms of this Contract.

     "Related Operator" means an entity (other than Owner) that holds a license
      ----------------
issued by the FCC permitting the holder to provide wireless PCS services, that
has entered into a contract with Owner to provide management responsibilities
with respect to the operation of such a service, that may be a party to
agreements pursuant to which Owner resells to or shares with such entity
capacity on Owner's System as, for example, when the Related Operator's cell
site equipment is interconnected with Owner's MSC; provided that, Vendor will
have a reasonable opportunity to review and approve any proposed Related
Operator (such approval not to be unreasonably withheld) based upon:  (a)
reasonable

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<PAGE>

credit criteria (provided, however, that such credit criteria shall not apply in
the event Owner is liable for the payment obligations of the Related Operator);
(b) whether the proposed Related Operator is, at the time of such determination,
a direct or indirect competitor of the Vendor or its affiliates or owned, in
whole or in part, by a direct or indirect competitor of Vendor; and (c) whether
the proposed Related Operator is, at the time of such determination, otherwise
engaged with the Vendor or it's affiliates in an agreement for the purchase
and/or supply of wireless technology.

     "RF" means radio frequency.
      --

     "RTM License" is defined in subsection 13.6.
      -----------

     "RTU License" is defined in subsection 13.1.
      -----------

     "Services" means the collective reference to all of the services to be
      --------
furnished by Vendor as part of the Work including, but not limited to all
design, engineering, network planning, construction, interoperability, supply,
delivery, installation, testing, training, repair, maintenance, technical and
other support services, and any and all other services to be furnished by Vendor
as part of the Work in accordance with the terms of this Contract.

     "Site" means the physical location of a System Element Facility.
      ----

     "Site Acceptance Certificate" means a document submitted by Vendor to Owner
      ---------------------------
and signed by an authorized representative of Owner and an authorized
representative of Vendor stating that, in accordance with the requirements of
this Contract, Vendor has successfully completed all Site Acceptance Tests with
respect to the Sites specified therein.

     "Site Acceptance Tests" means the collective reference to the performance
      ---------------------
and reliability demonstrations specified in the Exhibits to determine whether a
site meets the Specifications and other requirements of this Contract.

     "Site Acquisition" means the activities to be performed by Owner and/or its
      ----------------
subcontractors in connection with identifying and acquiring sufficient rights to
Sites.

     "Site Acquisition Substantial Completion" means, with respect to any
      ---------------------------------------
System, the point at which Owner shall have (i) acquired, by purchase, lease or
otherwise, rights to a sufficient number of Sites in the judgment of Owner, and
(ii) that, with respect to all Sites within such System, all land use and/or
lease requirements or any other activities necessary to be satisfied prior to
the start of construction activities in accordance with Applicable Laws have
been satisfied.

     "Site Acquisition Substantial Completion Date" means with respect to any
      --------------------------------------------
System, the date on which Owner shall have achieved Site Acquisition Substantial
Completion.

                                      11
<PAGE>

          "Site Construction" means the demolition, construction and renovation
           -----------------
work (for example, roads, grading, fencing and structural improvements,
including, but not limited to, any buildings, towers and commercial power) and
the preparation of co-location sites necessary for the installation of Equipment
or the operation of the System, Expansions and/or any part thereof.

          "Site Construction Substantial Completion" means the completion of
           ----------------------------------------
all Site Construction with respect to a Site except for Punch List items.

          "Site Construction Substantial Completion Certificate" is defined in
           ----------------------------------------------------
Section 10.1(b).

          "Software" means (a) the computer software licensed to Owner pursuant
           --------
to the terms of this Contract, (b) any Software Enhancements, Software
Maintenance Releases, Software Combined Releases and Software Upgrades, and (c)
any Documentation furnished hereunder in respect of clauses (a) and/or (b) of
this definition.

          "Software Combined Release" means a Software Upgrade which is at any
           -------------------------
time combined with any Software Enhancement.

          "Software Enhancements" means modifications or improvements made to
           ---------------------
the Software relating to Products which improve performance, capabilities or
capacity of the Software revision level with which it is associated or which
provide additional functions to the Software.  A Software Enhancement may also
correct defects in earlier versions of the Software.

          "Software Maintenance Release" means issues of Software which correct
           ----------------------------
defects in preceding versions of Software.

          "Software Upgrades" means periodic updates to the Software issued by
           -----------------
Vendor to Owner under Warranty and Software maintenance obligations which add
to, improve or enhance existing Software features and capabilities involving
more extensive changes to the underlying Source Code or the user interface than
is the case with Software Enhancements. A Software Upgrade may also correct
defects in the Software, or otherwise to correct shortcomings in the Software.

          "Source Code" means any version of Software incorporating high level
           -----------
or assembly language that generally is not directly executable by a processor.

          "Spares" is defined in Exhibit A11.
           ------

          "Specifications" means the collective reference to the product
           --------------
description documentation and performance standards (including all of the
Services and Products) as set forth in this Contract, including but not limited
to Exhibits P and R; provided that (i) the Specifications shall be deemed to
                     --------
include a requirement that all of the Products and Services

                                       12
<PAGE>

shall be reasonably in accordance with ANSI, ITU, and other applicable industry
standards as required for performance to the Specifications for all Products
provided hereunder, except when otherwise stated in a specific Exhibit or
Specifications or otherwise agreed by the parties, and (ii) with respect to
Services and Products for which product descriptions and performance standards
are not provided and listed in a specific Exhibit, the term "Specifications"
shall refer to Vendor's published specifications in respect thereof.

          "Subcontractor" means a contractor, vendor, supplier, licensor or
           -------------
other Person, having a direct or indirect contract with Vendor or with any other
Subcontractor of Vendor who has been hired to assist Vendor in the performance
of its obligations under this Contract.

          "Substantial Completion" means the time at which Owner signs the
           ----------------------
Certificate of Substantial Completion.

          "Switch" means a Vendor-engineered DMS-MTX providing switching
           ------
functions.

          "System" means the Sites and Equipment identified by Owner to Vendor
           ------
in writing as collectively comprising a system.

          "System Element" means the Products required to perform radio,
           --------------
switching and/or system element functions for a System or any Expansions.

          "System Element Facility" means the structures, improvements,
           -----------------------
foundations, towers, and other facilities necessary to house or hold any System
Element and any related Products to be located at a particular location.

          "Taxes" is defined in subsection 5.2.
           -----

          "Training" is defined in subsection 9.4.
           --------

          "Vendor Developments" is defined in subsection 14.3.1.
           -------------------

          "Vendor Financing" means a loan to be provided by Vendor to Owner
           ----------------
pursuant to documentation acceptable to both parties.

          "Warranty" means any one or more of the Equipment and Services
           --------
Warranty, Expansions Warranty, Software Warranty, Software Backwards
Compatibility Warranty, Equipment Backwards Compatibility Warranty, Compliance
Warranty and the Year 2000 Warranty.

          "Warranty Period" is defined in Section 18.1.
           ---------------

                                       13
<PAGE>

          "Work" means the furnishing of Products hereunder, and the performance
           ----
of work, engineering services, installation services and all other related
activities and obligations required to be performed by Vendor pursuant to this
Contract.

          1.2  Other Definitional Provisions. (a) When used in this Contract,
               -----------------------------
unless otherwise specified therein, all terms defined in this Contract shall
have the defined meanings set forth herein. Terms defined in the Exhibits are
deemed to be terms defined herein; provided that in the case of any terms that
                                   -------- ----
are defined both in this Contract and/or an Exhibit, the definitions contained
in this Contract shall supersede such other definitions for all purposes of this
Contract; provided further, that definitions contained in any Exhibit shall
          -------- -------
control as to such Exhibit.

          (b)  The words "hereof", "herein" and "hereunder" and words of similar
import when used in this Contract refer to this Contract as a whole and not to
any particular provision of this Contract and section, subsection, schedule and
exhibit references are to this Contract unless otherwise specified. Reference
herein to Section shall mean any and all subsections thereof.

          (c)  The meanings given to terms defined in this Contract are
applicable to both the singular and plural forms of such terms.

          SECTION 2.  SCOPE OF WORK, RESPONSIBILITIES AND PROJECT MILESTONES

          2.1  Scope of Work.  During the Contract Term and in accordance with
               -------------
Purchase Orders issued to Vendor from time to time, Vendor shall engineer,
design, plan, manufacture, construct, install, test and perform all Work. The
terms of this Contract shall also apply to Purchase Orders issued by Affiliates
and by Owner, for and on behalf of its Related Operators, provided that in each
case, the Purchase Orders are made pursuant to and incorporate by reference the
terms of this Contract. Vendor shall be responsible for providing in accordance
with the terms of this Contract any and all items and services which are
expressly described in this Contract or in the Exhibits. Vendor shall furnish
all labor, materials, tools, transportation and supplies required to complete
its obligations in accordance with this Contract.

          In instances where Purchase Orders are placed by an Affiliate or by
Owner on behalf of a Related Operator, Owner shall be considered the purchaser
for purposes of addressing invoices and the obligation of payment. Owner agrees
to be obligated hereunder with respect to all payments that become due hereunder
with respect to Purchase Orders placed by an Affiliate or by Owner on behalf of
a Related Operator, including but not limited to all payments for Products. The
Affiliate or Related Operator shall be deemed to be the Owner for purposes of
passage of title and risk of loss with regard to Products that are delivered to
it. The Affiliate or Related Operator shall be entitled to enforce all rights
and benefits of Owner under this Contract directly against Vendor with respect
to the respective purchases made by such entities, including without limitation
rights relating to Warranties,

                                       14
<PAGE>

indemnification, Documentation, System acceptance procedures, RTU Licenses,
other Software related licenses, Software and Equipment Enhancements and
Upgrades, technical assistance and Liquidated Damages. Vendor hereby consents to
the disclosure of all of the information contained in this Contract (including
without limitation the Exhibits hereto) to any Affiliate or Related Operator and
the use of the information contained in this Contract in any agreement between
Owner and any Affiliate or Related Operator relating to the purchase or sale of
Products and Services.

          Prior to any Affiliate or Owner, on behalf of a Related Operator,
issuing a Purchase Order hereunder, Owner agrees to require any such Affiliate
or Related Operator, as applicable, to (i) execute a software license directly
with Vendor, if such Affiliate or Related Operator is licensing Software, with
terms no less restrictive as those terms and conditions contained in the
software license herein, and (ii) agree to any other terms and conditions as set
forth in this Contract applicable to the Products or Services purchased.

          Subject to Section 20.4, Owner agrees to indemnify, defend and hold
harmless Vendor and its affiliates and their respective directors, officers,
employees, agents, successors and assigns, from Losses and threatened Losses
arising from, in connection with, or based on allegations of, any breach of the
terms of this Contract applicable to such Affiliate or Related Operator.

          2.2  [intentionally deleted]

          2.3  Site Acquisition.  Vendor shall offer to Owner the Site
               ----------------
Acquisition services set forth on Exhibit H. At Owner's option, Owner may
acquire any or all Sites. In the event Owner acquires Sites, Vendor, at its
request, shall be kept informed of the progress made on such Owner controlled
Site Acquisition activity. As the Site Acquisition progresses, Vendor agrees to
alter regularly the engineering plan to determine a new search ring or rings to
take into account any changes or modifications requested by Owner to take into
account any changes or modifications requested by Owner; provided that all such
changes or modifications requested by Owner shall be addressed pursuant to the
Change Order provisions described in Section 11 below. When making changes to
the RF engineering plan, Vendor shall take into account the Site Acquisition
already completed by Owner or Vendor. Upon Site Acquisition Substantial
Completion, Owner shall notify Vendor of the Site Acquisition Substantial
Completion Date.

          2.4  Expansions.  During the Contract Term, Owner may, from time to
               ----------
time, order Expansions from Vendor, subject to the provisions of Section 12. The
price and terms of such Expansions shall be as set forth in Exhibit A04.

          2.5  Review of Contract.  Each party has examined in detail and
               ------------------
carefully studied and compared the Contract with all other information furnished
by the other party and has promptly reported to the other party any material
errors, inconsistencies or omissions so discovered or discovered by any of its
Subcontractors.

                                       15
<PAGE>

          2.6  Eligibility under Applicable Laws and Applicable Permits. Vendor
               --------------------------------------------------------
shall be responsible for ensuring that Vendor and its Subcontractors are and
remain eligible under all Applicable Laws and Applicable Permits to perform the
Work under this Contract in the various jurisdictions involved including, to the
extent that Vendor will be responsible for construction for any particular
component of the Work, all such construction will be done in accordance with all
applicable Federal Communications Commission requirements. Each of Owner and
Vendor shall be responsible for obtaining and maintaining in full force and
effect the Applicable Permits listed as its responsibility in the applicable
Exhibits. Owner shall use its best commercially reasonable efforts to obtain
such approvals, licenses, permits, tariffs, and/or other authorities from the
Federal Communications Commission and state and local public utilities
commissions as may be necessary for construction and operation of a PCS System.

          2.7  Further Assurances. Vendor shall execute and deliver all
               ------------------
reasonable further instruments and documents, and will, in good faith, consider
all reasonable requests for further action, including, but not limited to,
assisting Owner in filing notices of completion with the appropriate state and
local Governmental Entity, that may be necessary or that Owner may reasonably
request in order to enable Owner or Vendor to complete performance of the Work
or to effectuate the purposes or intent of this Contract. All such requests
shall be addressed pursuant to the Change Order procedures described below in
Section 11.

          2.8  Liens and Other Encumbrances. (a) Vendor covenants and agrees,
               ----------------------------
subject to Vendor's receipt from Owner of full payment in respect thereof, to:

                         (i)  protect and keep free all Systems, Expansions
     and/or any and all interests and estates therein acquired from Vendor, and
     all improvements and materials now or hereafter placed thereon under the
     terms of this Contract, from any and all claims, liens, charges or
     encumbrances of the nature of mechanics, labor or materialmen liens or
     otherwise arising out of or in connection with the performance by Vendor of
     this Contract or any performance by any Subcontractor, and to promptly have
     any such lien released by bond or otherwise; and

                         (ii) give notice of this subsection to each
     Subcontractor before such Subcontractor furnishes any labor or materials
     for any System.

          (b)  If any laborers', materialmen's, mechanics', or other similar
lien or claim thereof is filed by any Subcontractor, Vendor shall use it best
commercial efforts to cause such lien to be satisfied or otherwise discharged,
or shall file a bond in form and substance satisfactory to Owner in lieu thereof
within ten (10) Business Days of Vendor's receipt of notice of such filing. If
any such lien is filed or otherwise imposed, and Vendor does not cause such lien
to be released and discharged forthwith, or file a bond in lieu thereof, then,
without limiting Owner's other available remedies, Owner has the right, but not
the obligation, to pay all sums necessary to obtain such release and discharge
or otherwise cause the lien to be removed or bonded to Owner's satisfaction from
funds retained from any payment then due or thereafter to become due to Vendor.

                                       16
<PAGE>

          (c)  Owner reserves the right to post or place within any System
notices of non-responsibility or to do any other act required by Applicable Law,
to exempt Owner from any liability to third parties by reason of any work or
improvements to be performed or furnished hereunder; provided that failure by
                                                     -------- ----
Owner to do so shall not release or discharge Vendor from any of its obligations
hereunder.

          2.9  Duty To Inform Itself Fully; Waiver of Defense. (a) Each party
               ----------------------------------------------
shall be deemed to have notice of and to have fully examined and approved the
Specifications, the Exhibits and all other documents referred to herein, and all
drawings, specifications, schedules, terms and conditions of this Contract,
regulations and other information in relation to this Contract and/or any
amendments, modifications or supplements thereto at all times on or after the
Effective Date and to have fully examined, understood and satisfied itself as to
all information of which it is aware and which is relevant as to the risks,
contingencies and other circumstances which could affect this Contract and in
particular the installation of any System or any part thereof.

          2.10 Advances Under The Credit Agreement. Advances under the credit
               -----------------------------------
agreement between Owner and Vender governing the Vendor Financing (the "Credit
Agreement") for Permitted Third Party Payments, as defined in the Credit
Agreement, shall be used for the purchase of equipment only when: (i) Vendor
does not manufacture equipment equivalent in Form, Fit and Function; (ii) Vendor
manufactures equipment equivalent in Form, Fit and Function, but Vendor does not
offer such equipment to Owner at a competitive price; or (iii) Vendor chooses
not to offer equivalent equipment to Owner.

          SECTION 3.  PURCHASE ORDERS AND SCHEDULES

          3.1  Purchase Orders. Owner and any Affiliate and Owner on behalf of a
               ---------------
Related Operator may deliver Purchase Orders to Vendor at any time and from time
to time during the Contract Term.  Such Purchase Orders shall be sent to Vendor
either by certified mail, electronic transmission or another mutually acceptable
manner to the address specified in Exhibit D of this Contract.  All Purchase
Orders shall be governed by the terms and conditions of this Contract, unless
otherwise agreed by the parties in writing.  Each Purchase Order shall reference
this Contract and specify, in reasonable detail, the Products, Services or other
items of Work to be provided by Vendor and whether the Purchase Order is being
submitted on behalf of a Related Operator.

          3.2  Delivery under the Contract. Vendor shall complete the Work
               ---------------------------
specified in each Purchase Order in accordance with the terms and conditions of
this Contract.

          3.3  Order Acceptance. All Purchase Orders shall be deemed to
               ----------------
incorporate and be subject to the terms and conditions of this Contract unless
otherwise agreed in writing. All Purchase Orders, including electronic orders,
shall contain the information necessary for Vendor to fulfill the order. All
schedules and requested dates are subject to Vendor's concurrence, provided that
if orders are made within the agreed to lead times

                                       17
<PAGE>

specified in Exhibit E, Vendor shall not withhold its concurrence to the
requested dates. No provision or data on any Purchase Order or contained in any
documents attached to or referenced in any Purchase Order, or any subordinate
document (such as shipping releases), which is inconsistent with the terms of
this Contract shall be binding, except data necessary for Vendor to fill the
order. All such other data and provisions are hereby rejected. Electronic orders
shall be binding on Owner notwithstanding the absence of a signature, provided
that the parties have implemented a mutually acceptable electronic order process
and such orders deemed to be binding have been issued by Owner and accepted by
Vendor in accordance with the process agreed upon by the parties. Vendor may
accept or reject any Purchase Order placed in accordance with the terms of this
Contract; provided that, any Purchase Order issued by Owner and not rejected in
writing within ten (10) Business Days shall be deemed accepted by Vendor;
provided further, Purchase Orders placed by Owner, any Affiliate or on behalf of
a Related Operator shall be afforded no less favorable treatment in terms of
acceptance than purchase orders placed by other customers of Vendor. Order
delivery schedules and intervals and forecast requirements are set forth in
Exhibit E.

          While it is Vendor's objective to provide Owner with an acknowledgment
of each order received, Owner shall advise Vendor to the extent that Owner
becomes aware of any missing or late notifications to ensure that the order has
not been lost.

          Changes made by Owner to an accepted Purchase Order shall be treated
as a separate order unless the parties expressly agree otherwise. If any such
change affects Vendor's ability to meet its obligations under the original
Purchase Order, any price, shipment date, or completion date quoted by Vendor
with respect to such original order is subject to change and shall be addressed
pursuant to the Change Order provisions below in Section 11.

          3.4  Forecasts.  Owner shall provide to Vendor regular forecasts of
               ---------
Owner's annual Product and Services needs. If the quantities ordered are more
than 25% greater than forecast quantities, Vendor shall be permitted a
reasonable extension of time at the time of the placement of the excess orders
to fulfill such orders and achieve the Milestones required of Vendor hereunder.

          3.5  Deployment Plans and Milestones. The deployment plans and
               -------------------------------
intervals, together with the key milestones, order intervals, in respect of each
System, are set forth in Exhibit E.

          3.6  Inventory Control and Bar-coding. Vendor shall, at no additional
               --------------------------------
charge, pack and mark shipping containers in accordance with its standard
practices for domestic shipments. Vendor shall (a) enclose a packing memorandum
with each shipment and, if the shipment contains more than one package, identify
the package containing the memorandum, and (b) mark Products as applicable for
identification in accordance with Vendor's marking specifications (for example,
model/serial number and month, year of manufacture).

                                       18
<PAGE>

          SECTION 4.  SUBCONTRACTORS

          4.1  Subcontractors.  Vendor may subcontract any portion of its
               --------------
obligations under this Contract, but no such subcontract shall relieve Vendor
from primary responsibility and liability for the performance of Vendor's
covenants and obligations under this Contract. Regardless of whether or not
Vendor obtains approval from Owner with respect to use of a Subcontractor or
whether Vendor uses a Subcontractor recommended by Owner, use by Vendor of a
Subcontractor shall not, under any circumstances: (i) give rise to any claim by
Vendor against Owner if such Subcontractor breaches its subcontract or contract
with Vendor; (ii) give rise to any claim by such Subcontractor against Owner;
(iii) create any contractual obligation by Owner to the Subcontractor; (iv) give
rise to a waiver by Owner of its rights to reject any Defects or Deficiencies or
Defective Work; or (v) in any way release Vendor from being solely responsible
to Owner for the Work to be performed under this Contract.

          4.2  Vendor's Liability. Vendor is responsible for all of its
               ------------------
obligations under this Contract, including the Work, regardless of whether a
subcontract or supply agreement is made or whether Vendor relies upon any
Subcontractor to any extent. Vendor's use of Subcontractors for any of the Work
shall in no way increase Vendor's rights or diminish Vendor's liabilities to
Owner with respect to this Contract, and in all events, except as otherwise
expressly provided for herein, Vendor's rights and liabilities hereunder with
respect to Owner shall be as though Vendor had itself performed such Work.
Vendor shall be liable for any delays caused by any Subcontractor as if such
delays were caused by Vendor.

          4.3  No Effect of Inconsistent Terms in Subcontracts. The terms of
               -----------------------------------------------
this Contract shall in all events be binding upon Vendor regardless of and
without regard to the existence of any inconsistent terms in any agreement
between Vendor and any Subcontractor whether or not and without regard to the
fact that Owner may have directly and/or indirectly had notice of any such
inconsistent term.

          4.4  Assignability of Subcontracts to Owner. Vendor shall use
               --------------------------------------
reasonable efforts to have each agreement between Vendor and a Subcontractor
contain a provision stating that, in the event that Vendor is terminated for
cause, convenience, abandonment of this Contract or otherwise, (i) each
Subcontractor shall continue its portion of the Work as may be requested by
Owner and (ii) such agreement may be assumed without penalty to Owner and, in
order to create security interests, may be assigned by Owner to third parties
designated by Owner, in either case at the option of Owner and for the same
price and under the same terms and conditions as originally specified in such
Subcontractor's agreement with Vendor.

          4.5  Removal of Subcontractor or Subcontractor's Personnel.  Owner
               -----------------------------------------------------
has the right at any time to request removal of a Subcontractor and/or any of a
Subcontractor's personnel from Work on the System upon reasonable grounds and
reasonable prior notice to Vendor. Such request (a "Request for Removal") shall
                                                     -------------------
be in writing and shall specify

                                       19
<PAGE>

Owner's reasoning therefor. Vendor promptly shall issue a written response to
any such Request for Removal, specifying the reasoning for its disagreement or
agreement, as the case may be, with the reasoning contained in the Request for
Removal. If the parties fail to agree, this matter shall be handled in
accordance with the dispute resolution procedures in Section 23. The exercise of
such right by Owner shall have no effect on the provisions of subsections 4.1
and 4.2.

          4.6  Subcontractor Insurance. Vendor shall require its Subcontractors
               -----------------------
to obtain, maintain and keep in force, during the time they are engaged in
providing Products and Services hereunder, insurance coverage of the types and
levels customary in the industry (provided that the maintenance of any such
Subcontractor insurance shall not relieve Vendor of its other obligations
pursuant to this Contract). Vendor shall, upon Owner's request, furnish Owner
with evidence of such insurance in form and substance reasonably satisfactory to
Owner.

          4.7  Review and Approval not Relief of Vendor Liability.  No
               --------------------------------------------------
inspection, review or approval by Owner permitted under this Contract of any
portion of the Work shall relieve Vendor of any duties, liabilities or
obligations under this Contract, but nothing contained in this subsection shall
be deemed a bar of any waiver given by Owner to Vendor pursuant to and in
accordance with the terms of this Contract.

          4.8  Vendor Warranties.  Except as otherwise expressly provided in
               -----------------
Section 18, the warranties of Vendor pursuant to Section 18 shall be deemed to
apply to all Work performed by any Subcontractor as though Vendor had itself
performed such Work and to all Products supplied by any third-party vendor or
other subcontractor as though Vendor itself had supplied such Products. Except
as otherwise specifically provided in Section 18, the parties agree that such
warranties shall not be enforceable merely on a "pass-through" basis but that
Owner may, but shall not be obligated to, enforce such warranties of any
Subcontractor to the extent that Owner determines that Vendor is not paying
and/or performing its warranties; provided that any such election by Owner shall
                                  -------- ----
not relieve Vendor from any obligations or liability with respect to any such
warranty.

          4.9  Payment of Subcontractors.  Vendor shall make all payments it is
               -------------------------
contractually required to make to all Subcontractors (except in the case of
legitimate disputes between Vendor and any such Subcontractor arising out of the
agreement between Vendor and such Subcontractor) in accordance with the
respective agreements between Vendor and its Subcontractors such that no
Subcontractor shall be in a position to enforce any liens and/or other rights
against Owner, the System, any Products or any part thereof.

          4.10 Copies. Subject to any confidentiality obligations insisted upon
               ------
by third party providers, including Subcontractors, Vendor will use its good
faith, reasonable efforts to provide Owner with any and all relevant agreements,
understandings, subcontracts and other documents pertaining to the provision of
Products or Services by a Subcontractor which Owner may reasonably require in
order for it to be provided with the information necessary to exercise any of
its rights under this Contract.

                                       20
<PAGE>

          4.11 Benefit of Subcontracts. In addition to anything else provided
               -----------------------
for in this Contract, Vendor shall make best commercially reasonable efforts to
ensure that Owner shall be entitled to the following benefits and rights of
Vendor under its contracts with any applicable third-party vendors or other
Subcontractors: all rights to conduct in-house tests, to receive notice of
upgrades and enhancements and to purchase spare parts; provided however, that
                                                       -------- -------
Vendor shall maintain sole responsibility for all obligations and other duties
under all such contracts.

          SECTION 5. PRICES AND PAYMENT

          5.1  Prices. (a) The prices for the Products, Services and other items
               ------
of Work for the Contract Term are set forth in Exhibits A01 - A10. The prices
for Expansions are also set forth in Exhibit A04.

          (b)  Price Protection.  [***]
               ----------------

          5.2  Taxes. Owner shall reimburse Vendor for all present or future
               -----
taxes, levies, imposts, deductions, charges, withholdings and liabilities
("Taxes") imposed on Vendor by any Governmental Entity relating to the provision
  -----
of Products and Services by Vendor to Owner under this Contract, provided,
however, that Owner shall not be liable for and shall not pay or reimburse
Vendor for (i) any Taxes on or measured by the income or receipts of Vendor, and
(ii) any import or export taxes, fees, imposts or charges imposed by any
Canadian or United States Governmental Entity on any of the Products or Services
furnished to Owner hereunder for deliveries of such Products in the United
States only. If Owner shall pay Taxes for which Vendor receives a credit, then
Vendor shall reimburse to Owner an amount equal to such credit.

          5.3  Payment. Payment for the Products and Services to be supplied
               -------
pursuant to this Contract shall occur as follows (in each case following
submission of an

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      21
<PAGE>

invoice by Vendor which shall properly document, to the reasonable satisfaction
of Owner, all the items included):

          (a)  Systems

               (i)  Products for Systems provided hereunder: Except as set forth
                    ---------------------------------------
          in subsections (b) and (c) below,

                    (1) [*] of the amount of all Purchase Orders completed by
               Vendor with respect to a Site shall be invoiced upon shipment of
               the Products in respect of such Purchase Orders;

                    (2) [*] of the amount of all Purchase Orders completed by
               Vendor with respect to a Site shall be invoiced upon completion
               of Installation and Integration of the Products with respect to
               each Site;

                    (3) [*] of the amount of all Purchase Orders completed by
               Vendor with respect to a Site shall be invoiced upon the date
               Owner signs a Certificate of Substantial Completion that covers
               the Products forming part of such Purchase Orders; provided that
               in the event that a Certificate of Substantial Completion is not
               issued within five (5) Business Days after the Guaranteed
               Substantial Completion Date because of a delay in reaching
               Substantial Completion solely attributable to the failure or lack
               of performance of Owner to satisfy its obligations and
               commitments in a timely manner, such amount shall be invoiced on
               the fifth (5/th/) Business Day following the Guaranteed
               Substantial Completion Date; and

                    (4) the balance of all amounts due Vendor pursuant to
               completed Purchase Orders with respect to Products for a System
               shall be invoiced upon Final Acceptance of such System; provided,
               however, notwithstanding anything to the contrary contained in
               this Contract, the balance of all such amounts shall be due no
               later than [*] from Substantial Completion.

               (ii) Services for Systems provided hereunder: Except as set
                    ---------------------------------------
          forth in subsections (b) and (c) below,

                    (1) [*] of the amount of all Purchase Orders completed by
               Vendor with respect to a Site shall be invoiced upon completion
               of the Services in respect of such Purchase Orders;

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      22

<PAGE>

                    (2) [*] of the amount of all Purchase Orders completed by
               Vendor with respect to a Site shall be invoiced upon the date
               Owner signs a Certificate of Substantial Completion that covers
               the Services forming part of such Purchase Orders; provided that
               in the event that a Certificate of Substantial Completion is not
               issued within five (5) Business Days after the Guaranteed
               Substantial Completion Date because of a delay in reaching
               Substantial Completion solely attributable to the failure or lack
               of performance of Owner to satisfy its obligations and
               commitments in a timely manner, such amount shall be invoiced on
               the fifth (5/th/) Business Day following the Guaranteed
               Substantial Completion Date; and

                    (3) the balance of all amounts due Vendor pursuant to
               completed Purchase Orders with respect to Services for a System
               shall be invoiced upon Final Acceptance of such System; provided,
               however, notwithstanding anything to the contrary contained in
               this Contract, the balance of all such amounts shall be due no
               later than [*] from Substantial Completion.

          (b)  Subcontracted Services: Services provided by Subcontractors shall
               ----------------------
be invoiced as performed, or as soon thereafter as practical but in no event
more frequently than monthly.

          (c)  Expansions (Growth):
               -------------------

                   (1)  [*] of the amount of all Purchase Orders completed by
              Vendor with respect to Products for which Vendor provides
              installation Services pursuant to an Expansion shall be invoiced
              upon shipment of such Products to the initial location specified
              on Owner's Purchase Order; and

                   (2)  [*] of the amount of all Purchase Orders completed by
              Vendor with respect to Products for which Vendor provides
              installation Services pursuant to an Expansion shall be invoiced
              upon completion of installation of such Products; and

                   (3)  [*] of the amount of all Purchase Orders completed by
              Vendor with respect to Products for which Vendor provides no
              installation Services pursuant to an Expansion shall be invoiced
              upon shipment of such Products.

          (d)  Payment of Invoices.  Owner shall pay the invoiced amounts, less
               -------------------
any disputed amounts, within ten (10) days from the date of transmission of
Vendor's invoice.  Delinquent payments are subject to a late payment charge
after twenty (20) days at the rate

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      23

<PAGE>

of [*] per month, or portion thereof, of the amount due (but not to exceed the
maximum lawful rate).  Any disputed items which are determined to be validly
billed are due for payment based upon the original invoice date.

          5.4  No Payment in Event of Material Breach. Subject to Subsection
               --------------------------------------
24.5, Owner shall have no obligation to make any payment for any Work with
respect to which Vendor is in material breach of this Contract until and unless
such breach is cured or waived by Owner in accordance with the terms of this
Contract.

          5.5  In Revenue Payments. At any time during a period of delay Owner
               -------------------
may, in its sole discretion, decide to place a System which is subject to such
delay into In Revenue Service. Such placement into In Revenue Service shall
constitute Substantial Completion only for purposes of the payment obligations
above, but shall not in any way relieve Vendor of any of its obligations under
this Contract, including without limitation achieving a Guaranteed Substantial
Completion Date nor shall such In Revenue Service trigger the commencement of
the Initial Period.

          5.6  Currency and Place of Payment. Payments under this Contract shall
               -----------------------------
be made in US dollars and if such method of payment is acceptable to Owner,
Owner shall pay all amounts due Vendor hereunder using Electronic Funds Transfer
("EFT"). EFT payments by Vendor shall be made to the following account of Vendor
or such other account as is subsequently designated by Vendor in writing.

          [***]
          [***]
          [***]
          [***]

          SECTION 6.  AVAILABILITY OF INTEROPERABILITY SPECIFICATION ("IOS")
                      ------------------------------------------------------

          6.1  Availability of IOS.  Availability of IOS is described in Exhibit
               -------------------
S.

          SECTION 7.  [intentionally omitted]

          SECTION 8.  SERVICES

          8.1  Transportation. Vendor shall at Vendor's sole cost and expense
               --------------
provide for the transportation and delivery to the Sites of all the Products to
be delivered pursuant to, and in accordance with, each Purchase Order and the
terms of this Contract. In the event of any unusual Site selections or
requirements which require transportation arrangements out of the ordinary
course having regard to normal industry standards and practices (such as crane
requirements, helicopter transportation requirements to a remote setting, etc.),
Vendor

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      24

<PAGE>

shall arrange, subject to Owner's prior approval, for such exceptional
transportation requirements from local staging facilities or warehouse locations
to the unusual Site. Vendor shall notify Owner that it believes, in good faith,
that exceptional transportation arrangements are necessary in the circumstances,
and Vendor will consult with Owner on an approved course of action to complete
delivery. Owner shall be responsible for all costs with respect to such
exceptional transportation requirements in excess of transportation costs
applicable to a standard Site.

          8.2  Services.  Vendor shall provide the Services ordered by Owner in
               --------
accordance with the provisions of the Exhibit hereto in respect of such
Services, including, without limitation, the following Services:  RF Design
Services as stated in Exhibit M, construction management services as stated in
Exhibits J1 and J2, and site construction services as stated in Exhibit K,
architectural and engineering services as stated in Exhibits I1 and I2, RF
Optimization Services as set forth in Exhibit N, Installation and Integration
services as set forth in Exhibits L and O, and support services as stated in
Exhibit T1.

          8.3  No Interference. Vendor shall install all Equipment and build
               ---------------
each of the Systems so as to cause no unauthorized interference with or
obstruction to lands and thoroughfares or rights of way on or near which the
installation work may be performed. Vendor shall exercise every reasonable
safeguard to avoid damage to existing facilities, and if repairs or new
construction are required in order to replace facilities damaged by Vendor due
to its negligence or willful misconduct, such repairs or new construction shall
be at Vendor's sole cost and expense. Vendor understands that many of the Sites
may be co-located with other RF transmission facilities and Vendor shall take
all necessary precautions and safety measures to ensure the safety of all of
Vendor's and Subcontractors' personnel at such Sites. Owner shall use its best
commercially reasonable efforts to ensure that no other third parties employed
or engaged by Owner hinder or delay Vendor in the performance of its
installation obligations hereunder.

          Vendor represents and warrants that all Products furnished hereunder
shall comply, to the extent required, with the requirements of Part 24 of the
Federal Communication Commission's Rules and Regulations (the "FCC Rules")
                                                               ---------
pertaining to personal communications services in effect upon delivery of such
Product. In addition, Vendor represents and warrants that a Product furnished
hereunder shall comply, to the extent required, with the requirements of Subpart
J of Part 15 of the FCC Rules in effect upon delivery of such Product, including
those sections concerning the labeling of such Product and the suppression of
radio frequency and electromagnetic radiation to specified levels. Vendor makes
no undertaking with respect to harmful interference caused by (i) unauthorized
installation, repair, modification or change or Products not furnished by
Vendor; (ii) Products being subject to misuse, neglect, accident or abuse by
other than Vendor; (iii) Products being used in a manner not in accordance with
operating instructions or in a suitable installation environment or operation of
other equipment in the frequency ranges reserved for Owner within the applicable
licensed area. Vendor assumes no responsibility under this clause for items not
specified or supplied by Vendor. The foregoing warranties are collectively
referred to as the "Compliance Warranty".
                    -------------------

                                      25
<PAGE>

          Vendor shall, when appropriate, have reasonable access to Owner's
premises during normal business hours and at such other times as may be agreed
upon by the parties in order to enable Vendor to perform its obligations under
this Contract. Vendor shall coordinate such access with Owner's designated
representative prior to visiting such premises. Vendor agrees to instruct its
employees to comply with all site rules while on Owner's premises. The employees
and agents of Vendor shall, while on Owner's premises, comply with all site
rules and guidelines including, but not limited to, where required by government
regulations. Neither party shall require waivers or releases of any personal
rights from representatives of the other in connection with visits to its
premises, and no such releases or waivers shall be pleaded by either party in
any action or proceeding.

          For purposes of this Section, all references to "Owner's premises" and
other similar references shall be deemed to refer to any location where a Site
is to be located, which may include land or buildings owned or leased by Owner.
To the extent that Owner does not own the premises, Vendor's obligations to
adhere to site rules and guidelines shall include, without limitation, those
rules and guidelines required by the owner, landlord or property manager having
care and control of such premises, which Owner has provided to Vendor in advance
of the commencement of the applicable Work hereunder.

          SECTION 9. MANUALS, ENGINEERING DRAWINGS AND TRAINING

          9.1  Documentation. Vendor shall provide the Documentation in the
               -------------
amounts and formats listed in Exhibit R. The Documentation shall be prepared in
accordance with the relevant Specifications. Operating Manuals with up-to-date
drawings, specifications and design sheets shall be available for the Training
as set forth in subsection 9.4.

          9.2  Standards for Manuals.  All Operating Manuals and Maintenance and
               ---------------------
Instruction Manuals required to be provided by Vendor pursuant to this Contract
shall be accurate and shall be:

          (a)  detailed and comprehensive and prepared in conformance with the
     Specifications and generally accepted national standards of professional
     care, skill, diligence and competence applicable to telecommunications and
     operation practices for facilities similar to the Systems;

          (b)  consistent with good quality industry operating practices for
     operating personal communications service systems of similar size, type and
     design;

          (c)  sufficient to enable Owner to operate and maintain each System on
     a continuous basis; and

          (d)  prepared subject to the foregoing standards with the goal of
     achieving operation of each System at the capacity, efficiency,
     reliability, safety and

                                      26
<PAGE>

     maintainability levels contemplated by this Contract and required by all
     Applicable Laws and Applicable Permits.

          9.3  Equipment and Data. Vendor shall furnish all drawings,
               ------------------
specifications, specific design data, preliminary arrangements and outline
drawings of the Equipment and all other information as required in accordance
with this Contract in sufficient detail to indicate that the Equipment and
fabricated materials to be supplied under this Contract comply with the
Specifications.

          9.4  Training. As more fully described in Exhibits A12 and A13, Vendor
               --------
shall provide to Owner a training program with respect to each System
(collectively, the "Training"). Promptly upon execution of this Contract, Vendor
                    --------
shall establish a training coordinator, whose responsibility shall be to work
with Owner to ensure that Owner receives the Training. Such coordinator (or his
or her replacement) shall continue in such assignment until the receipt by Owner
of all of the Training required to be provided.

          9.5  Manuals and Training. The Training and the Documentation provided
               --------------------
in connection herewith, including, without limitation, all Documentation
provided in CD-ROM format and all documentation provided pursuant to subsections
9.2, 9.3 and 9.4 shall be updated in reasonable quantities at no additional cost
to Owner pursuant to and in accordance with all Product upgrades and/or
modifications applicable to any System and/or any part thereof.

          SECTION 10.  ACCEPTANCE PROCEDURES

          10.1  Acceptance Procedures.  Depending upon the specific Products and
                ---------------------
Services to be furnished by Vendor, and those tasks for which Owner shall assume
responsibility, the parties, directly or through third-party vendors or other
Subcontractors, as the case may be, shall carry out the following procedures.

          (a)  Factory Tests Owner may, at Owner's option and cost, be present
               -------------
at any factory testing conducted by Vendor. Upon request, Vendor shall give
Owner ten (10) Business Days advance notice of any such factory testing relating
to the types of Products or Services furnished by Vendor hereunder. Vendor shall
cooperate with Owner to facilitate Owner's observation of such tests. Regardless
of whether or not Owner observes any factory testing, Vendor agrees to, within a
reasonable period of time in view of the nature and urgency of the request, upon
written request by Owner, provide Owner with copies of all documentation
relating to factory testing of the Product specified by Owner, including without
limitation copies of test procedures, test results and FCC compliance
certifications.

          (b)  Site Construction Substantial Completion At Owner's option,
               ----------------------------------------
Vendor shall perform all Site Construction activities with respect to Sites
designated by Owner. Upon completion of all Site Construction with respect to
each Site for which Owner has issued a Purchase Order directing Vendor to
proceed with Site Construction activities, Vendor shall issue a Site
Construction Substantial Completion Certificate ("Site
                                                  ----

                                    27
<PAGE>

Construction Substantial Completion Certificate") certifying that all Site
------------------------------------------------
Construction specified in the Purchase Order is substantially complete. Such
certificate shall be accompanied by a Punch List of all incomplete items which
items shall be completed by Vendor prior to Final Acceptance. Vendor shall offer
construction management, architectural & engineering, site civil construction
and antenna installation and testing as provided for in Exhibits J1, J2, I1, I2,
and K and at pricing consistent with that set forth in Exhibit A03. In the event
Owner performs Site Construction with respect to a Site, Owner shall issue the
Site Construction Substantial Completion Certificate.

       (c)  Site Installation and Integration Completion Certificate.  Upon
            --------------------------------------------------------
completion of the installation of the BTS and other Products and the completion
of integration activities in accordance with Exhibits L and O, Vendor shall
issue a Site Installation and Integration Substantial Completion Certificate
certifying that all installation and integration activities specified in the
Purchase Order are substantially complete.  Such certificate shall be
accompanied by a Punch List of all incomplete items which items shall be
completed by Vendor prior to Final Acceptance.

       (d)  Certificate of Substantial Completion.  Upon completion of RF
            -------------------------------------
Optimization Services and all testing with respect to a System in accordance
with Exhibit N, Vendor shall issue a Certificate of Substantial Completion,
which shall be in the form of a checklist listing all tests performed and the
results thereof, and shall be accompanied by a Punch List of outstanding items
(the "Certificate of Substantial Completion").  Upon its reasonable satisfaction
      -------------------------------------
that the Certificate of Substantial Completion is correct and complete, Owner
shall promptly sign the Certificate of Substantial Completion.

       (e)  "Beta" Tests Upon written notice to Vendor, Owner shall be entitled,
             ------------
in its sole discretion to conduct beta testing, and in connection therewith
Owner shall be entitled to add appropriate items to the Punch List prior to
Final Acceptance.

       (f)  Certificate of Final Acceptance.  During the [*] period following
            -------------------------------
Substantial Completion (as extended as described below, the "Initial Period"),
Vendor shall complete all outstanding Punch List items and Owner and Vendor
shall monitor the System for outages and compliance with the Specifications.  In
event that all Punch List items have been completed during the Initial Period,
all testing specified in Exhibit L has been satisfactorily completed and there
have been no Major Outages, then at the end of the Initial Period Vendor shall
issue a Certificate of Final Acceptance certifying the same.  Upon its
reasonable satisfaction that the Certificate of Final Acceptance is correct and
complete, Owner shall sign the Certificate of Final Acceptance.  In the event
that a Major Outage occurs during the Initial Period, the Initial Period shall
be extended (each, an "Extension Period") as follows: (i) if a Major Outage
                       ----------------
occurs on or prior to [*] after the commencement of the Initial Period, the
Initial Period shall be extended for an additional [*], (ii) if a Major Outage
occurs after [*] but on or prior to [*] after the commencement of the Initial
Period, the Initial Period shall be extended for an additional [*], and (iii) if
a Major Outage occurs after [*] but on or prior to [*] after the commencement of
the Initial

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      28

<PAGE>

Period, the Initial Period shall be extended for an additional [*]; provided,
however, the Extension Period shall be limited to a total of [*]. In the event a
Major Outage occurs during any Extension Period, the Initial Period shall be
further extended by an additional period of [*]; provided that, in the event
that Final Acceptance has not occurred after [*] from Substantial Completion,
Final Acceptance shall occur when the System has operated without a Major Outage
for a period of [*] continuous [*] and all Punch List items are completed.
Provided that Vendor has completed all Punch List items and all other
requirements set forth in Exhibit L, Owner shall issue a Certificate of Final
Acceptance not later than the end of the Initial Period (as extended) after
receipt of notice from Vendor containing (i) a statement that Vendor has
corrected the problem giving rise to the Major Outage or Major Outages, and (ii)
a description of the corrections made. Documentation not already delivered to
Owner pursuant to the terms of this Contract shall be delivered to Owner within
ten (10) Business Days of Final Acceptance. With respect to each System, Owner
shall not be required to sign the Certificate of Final Acceptance until all such
Documentation has been so delivered (and Final Acceptance shall not be deemed to
have occurred earlier than the date that is ten (10) Business Days prior to the
date of delivery of such Documentation). In addition to, and without limiting
the requirements set forth in the preceding sentence, the Operating Manuals and
the Maintenance and Instruction Manuals shall be submitted to Owner in CD-ROM
format (when available) in addition to hard-copy volume format if so requested
by Owner.

        10.2  Costs and Expenses.  The costs and expenses of complying with all
              ------------------
acceptance procedures set forth above shall be borne by Vendor, provided that
Owner remains responsible for completing those items identified as Owner's
responsibility in the Exhibits.

        SECTION 11. CHANGE ORDERS AND SCHEDULING

        11.1  Change Orders.  Owner has the right to request expansions, other
              -------------
revisions and/or modifications to any Purchase Order or to the Work ("Changes"),
                                                                      -------
including but not limited to the Specifications, the manner of performance of
the Work or the timing of the completion of the Work.  All Changes shall be
subject to the prior written consent of Vendor.  All Changes shall be documented
in a written order ("Change Order") which shall be executed by Owner and Vendor
                     ------------
and shall contain any adjustments to pricing, Milestone or other aspect of the
Work as mutually agreed by the parties.  Vendor shall promptly notify Owner of
any such requested Changes which may materially affect the operation and/or
maintenance of any System or any part thereof.  In the event that the parties
cannot agree on a Change Order within fifteen (15) days of submission of a
Change Order by Owner to Vendor, the matter shall then be referred to dispute
resolution pursuant to Section 23.  Nothing contained in this subsection is
intended to limit Vendor's right, from time to time, to make suggestions for
modifications to the Work or the Specifications, provided that in any such event
                                                 -------- ----
Owner, in its sole and absolute discretion pursuant to the terms of this
Contract may refuse to make any such modification or otherwise agree to issue a
Change Order incorporating any such Vendor suggestion.

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      29

<PAGE>

     11.2  Cancellation.  Owner may at any time cancel, in whole or in part, any
           ------------
Purchase Order or Change Order upon advance written notice to Vendor.  In the
event of such cancellation, Owner shall pay to Vendor cancellation charges in
accordance with Exhibits B1 and B2.

     SECTION 12. DISCONTINUED PRODUCTS AND CONTINUING PRODUCT SUPPORT

     12.1  Notice of Discontinuation. For a period of [*] for the Switch and [*]
           -------------------------
for all other Products furnished hereunder after the Effective Date, but in no
event less than [*] after the date of shipment, Vendor agrees to provide Owner,
and all Affiliates and Related Operators that have purchased Products hereunder,
not less than [*] notice before Vendor discontinues manufacturing of or support
for a Product ("Discontinued Products") furnished under this Contract.  In
                ---------------------
respect of Products manufactured by a third party vendor, the notice period may
vary. Where Vendor offers a product for sale that is equivalent in Form, Fit and
Function in accordance with and pursuant to the Specifications, the notification
period may vary but in no event shall be less than [*]. In the case of each
Discontinued Product, Vendor shall furnish Products fully compatible with the
relevant System Elements within the System prior to the time that a Product is
discontinued during the appropriate [*] and [*] periods referenced above;
provided that, nothing herein shall bar the Vendor from discontinuing individual
items of Products as provided in and pursuant to this subsection. In the event
that Vendor discontinues a Product, Vendor will meet with Owner and use
reasonable, good faith efforts to develop a mutually acceptable transition plan
that takes into account Owner's existing investment in the item scheduled for
discontinuance.

     In addition to repairs provided for under any applicable Warranty, Vendor
shall offer repair Services and repair parts in accordance with Vendor's repair
and repair parts practices and terms and conditions then in effect, for Vendor-
manufactured Equipment furnished pursuant to this Contract. Such repair Services
and repair parts shall be available while Vendor is manufacturing or stocking
such Products or repair parts, but in no event less than [*] for the Switch and
[*] for all other Products after such Product's discontinued availability
effective date. Vendor may use either the same or functionally equivalent
products or parts which are new, remanufactured, reconditioned or refurbished in
the furnishing of repairs or replacements under this Contract.

     If during the agreed-to support period following the issuance of notice of
discontinuance, Vendor fails to provide repair parts and/or repair Services and
a functionally equivalent replacement has not been designated, Vendor shall so
advise Owner, to allow Owner to plan appropriately, and if Vendor is unable to
identify another source of supply for such repair parts or services, Vendor
shall, in addition to any other right or remedy available to Owner at law or in
equity, provide Owner, at no additional charge to Owner, upon request, with non-
exclusive licenses for Product manufacturing to the extent Vendor can grant such
licenses, so that Owner will have sufficient information,

[*] Certain material (indicated by an asterisk) has been omitted form this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                      30

<PAGE>

ability and rights to have such Discontinued Products manufactured, or obtain
such repair Service or repair parts from other sources. Such license shall
include appropriate non-disclosure and confidentiality covenants.

     12.2  Discontinuation During Warranty Period.  If Vendor discontinues the
           --------------------------------------
availability of a Product during that Product's Warranty Period and Owner is
required to purchase a replacement Product to replace the Discontinued Product
in order to maintain the same functionality of the Discontinued Product in a
System, Vendor agrees to grant Owner an additional [*] discount to be applied
against the net price of all Products required to be purchased by Owner as
replacements for such Discontinued Product, which additional discount shall be
applied after the determination of the lowest price available to Owner pursuant
to this Contract.

     12.3  Discontinuation After Warranty Period.  If Vendor discontinues the
           -------------------------------------
availability of a Product after that Product's Warranty Period, Owner shall be
afforded no less favorable treatment in terms of Vendor's manufacturer's
discontinuation programs offered to Vendor's other customers.

     SECTION 13.  SOFTWARE

     13.1  RTU License. Upon delivery of the Software, but subject to payment of
           -----------
the license fees specified in Exhibit A05, Owner is hereby granted a personal,
non-exclusive, fully paid-up, multi-site (capability to move Software from site
to site on prior notice to Vendor) right to use license for the Software ("RTU
                                                                           ---
License"), to operate the specific Equipment, processor or product line for
-------
which the licenses to use the Software are initially granted, or temporarily on
any comparable replacement if any such Equipment, processor or product line
becomes inoperative.  Owner shall use such Software only for its own internal
business operation, or, in the case where the Software is purchased by or on
behalf of Affiliates or Related Operators, for the internal business operations
of such Affiliates and Related Operators.  The RTU License grants Owner no right
to, and Owner will not, sublicense such Software or modify, decompile, reverse
engineer, or disassemble, or in any other manner decode Software furnished as
object code for any reason, including without limitation, to generate
corresponding source code provided in each of the Systems.  Except as provided
below, no license is granted to Owner to use the Software outside of the United
States.

     In the event that Owner wishes to use the Software on associated equipment
outside of the United States or to transfer Software to an affiliate or third
party transferee located outside the United States, Vendor shall not
unreasonably withhold its consent to such use or transfer, provided that Vendor
or the transferee, as the case may be, enters into an appropriate license
agreement with an affiliate of Vendor carrying on business in the territory in
which the Software is to be located, on terms substantially similar to the RTU
License terms set forth herein, provided, however, that Owner acknowledges and
agrees that support and maintenance obligations set forth herein are only
applicable for Software resident on Equipment located within the United States.
Support and maintenance Services

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       31
<PAGE>

offered by Vendor's affiliates differs in various different territories, and
will be subject to the local practices maintained in such territory.

     13.2  Owner's Obligations.  Owner agrees that the Software, whether or not
           -------------------
modified, and all copies thereof made by Owner, shall be treated as trade
secrets and proprietary to Vendor, its Subcontractors or its suppliers, as
appropriate and Owner shall:

     (a)  Utilize the Software solely in conjunction with a System; provided
                                                                    --------
that Vendor acknowledges that the Software shall be integrated across interfaces
----
with systems, equipment and software provided by other suppliers and customers;

     (b)  Ensure that all copies of the Software shall, upon any reproduction by
Owner authorized by Vendor and whether or not in the same form or format as such
Software, contain the same proprietary, confidentiality and copyright notices or
legends which appear on the Software provided pursuant hereto; and

     (c)  Hold secret and not disclose the Software to any person, except to (i)
such of its employees, contractors, agents or affiliates that are involved in
the operation or management of a System and need to have access thereto to
fulfill their duties in such capacity, or (ii) other Persons who need to use
such Software to permit integration of a System with systems and software of
other suppliers and customers; provided that such persons agree, or are
                               -------- ----
otherwise obligated, to hold secret and not disclose the Software to the same
extent as if they were subject to this Contract, and provided further that if
any such Person is a competitor of Vendor involved in the manufacture of
communications equipment, software or related services, Vendor must approve such
use on a case-by-case basis on commercially reasonable terms and such use shall
be subject to an appropriate non-disclosure agreement.

     (d)  When and if Owner determines that it no longer needs the Software or
if Owner's license is canceled or terminated pursuant to the terms of this
Contract, return all copies of such Software to Vendor or follow reasonable
written disposition instructions provided by Vendor.  If Vendor authorizes
disposition by erasure or destruction, Owner shall remove from the medium on
which Software resides all electronic evidence of the Software, both original
and derived, in such manner that prevents subsequent recovery of such original
or derived Software.

     (e)  Owner shall not copy Software embodied in firmware and unless
otherwise specifically provided in this Contract, Owner is not granted any right
to modify Software furnished by Vendor under this Contract.

     13.3  Backwards Compatibility. Vendor represents and warrants (the
           -----------------------
"Software Backwards Compatibility Warranty") that each Software Maintenance
------------------------------------------
Release, Software Upgrade and Software Enhancement will be Backwards Compatible.
[***]

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       32
<PAGE>

     13.4  Transfer and Relocation.  (a) In the event Owner or any successor to
           -----------------------
Owner's title in the Products (i) elects to transfer a Product to a third party,
and where such Product shall remain in place and used for substantially the same
purpose as used by Owner and where such third party resides in the United States
and is not a direct competitor of Vendor involved in the manufacture of
communications equipment, software or related services, or (ii) elects to
transfer Products to an affiliate, Owner may transfer its RTU License for the
Software furnished under this Contract for use with such Product, without the
payment of any additional Software right-to-use fees by the transferee.  For
example, if the RTU License for the Software contains usage or per subscriber
limits, or the processor to be used by transferee requires additional memory or
hard disk space additional payments or purchases may be required.  The following
conditions shall apply to transfers and relocations pursuant to this subsection
13.4:

     (A)   The right to use such Software may be transferred only together with
           the Products with which Owner has a right to use such Software, and
           such right to use the Software shall continue to be limited to use
           with such Products;

     (B)   Before any such Software is transferred, Owner shall notify Vendor of
           such transfer and the transferee shall have agreed in writing (a copy
           of which shall be provided to Vendor) to keep the Software in
           confidence and to corresponding conditions respecting possession and
           use of Software as those imposed on Owner in this Contract; and

     (C)   The transferee shall have the same right to Software warranty and
           Software maintenance for such Software as the transferor, provided
           the transferee continues to pay the fees, including recurring fees,
           if any, associated with such Software warranty or maintenance
           pursuant to this Contract.

     (b) Except as otherwise provided in this Contract, Owner or any successor
to Owner's title in the Products shall have no right to transfer Software
furnished by Vendor under this Contract without the consent of Vendor, which
consent shall not be unreasonably withheld. If Owner or such successor elects to
transfer a Product purchased under this Contract for which it does not under
this Contract have the right to transfer related Software, Vendor agrees that
upon written request of the transferee of such Product, or of Owner or such
successor, Vendor shall not without reasonable cause fail to grant to the
transferee a license to use such Software with the Products, whether to be
located within the United States or elsewhere, upon payment of a relicensing fee
to Vendor on commercially reasonable terms acceptable to Vendor.

     13.5  Termination and Survival.  The rights and obligations of Owner under
           ------------------------
the RTU License shall survive the termination of this Contract, regardless of
the cause of termination provided Owner has met its material obligations
hereunder and has rendered all payments in accordance with this Contract. In the
event that Owner materially breaches its

                                       33
<PAGE>

obligations hereunder with respect to the RTU License, and if Vendor has
provided Owner with prior written notice describing the alleged material
breaches and given Owner a reasonable time (in no event less than thirty (30)
days) to cure any such breaches, Vendor may terminate Owner's RTU License. In
the event that Owner fails to pay applicable license fees, Vendor may terminate
Owner's right to use the Software to which such fees apply; provided that,
Vendor provided written notice of such breach to Owner and Owner failed to make
payment within ten (10) days from Vendor's notice thereof. Such terminated
rights shall be immediately reinstated upon payment of all applicable license
fees. In no event other than as set forth in this subsection 13.5 may Vendor
terminate Owner's right to use the Software. Notwithstanding any other provision
of this Contract, if there is a dispute, pending final resolution of such
dispute, all of Owner's rights under this Contract shall continue in full force
and effect, and Vendor will not terminate the RTU License, and so long as Owner
continues to pay Vendor applicable fees, Vendor will not terminate, suspend,
interrupt or delay maintenance and support of the Software.

     13.6  Access to Source Codes. Vendor represents and warrants that as of the
           ----------------------
date hereof, Vendor has not established a Source Code escrow for any of its
existing customers.  In the event that Vendor establishes a Source Code escrow
in the future which applies to any of the Software furnished to Owner hereunder,
Vendor shall add Owner as a beneficiary of such Source Code escrow, and Owner
shall be entitled to receive a copy of the escrowed Source Code in the event of
the occurrence of any of the events set out below.  In addition to the
foregoing, Vendor shall immediately deliver and hereby grants Owner a right to
access the Source Code and to modify the Software (the "RTM License") for the
                                                        -----------
maintenance, enhancement and support of those Products purchased from Vendor and
owned or operated by Owner under the following circumstances, provided that any
such released Source Code shall be subject to the confidentiality provisions set
forth in this Contract:

               (i)  if Vendor becomes insolvent, makes a general assignment for
     the benefit of creditors, files a voluntary petition in bankruptcy or an
     involuntary petition in bankruptcy is filed against Vendor which is not
     dismissed within sixty (60) days, or suffers or permits the appointment of
     a receiver for its business, or its assets become subject to any proceeding
     under a bankruptcy or insolvency law, domestic or foreign, or has
     liquidated its business, or Vendor, or a business unit of Vendor that is
     responsible for maintenance of the Software, ceases doing business without
     providing for a successor, and Owner has reasonable cause to believe that
     any such event shall cause Vendor to be unable to meet its Warranty service
     or support requirements hereunder; or

               (ii) if Vendor ceases to maintain or support a previously
     supported version of the Software and Owner cannot obtain, with Vendor's
     assistance (for example, by providing a third party with Source Code or by
     any other appropriate method) the same support services Vendor is required
     to provide under this Contract from another entity (either working with or
     independently from Vendor) at a price that is equal to or less than the
     prices for such support as provided herein, or there is a persistent and
     material failure by Vendor to provide the

                                       34
<PAGE>

     Warranty service or support it is required to provide pursuant to the terms
     of this Contract.

          13.7  Ownership of Intellectual Property.  Vendor shall own all forms
                ----------------------------------
of intellectual property rights (including, but not limited to, patent, trade
secret, copyright and mask rights) pertaining to the Software, and shall have
the right to file for or otherwise secure and protect such rights.  The
foregoing notwithstanding, the parties understand and agree that from time to
time Owner may independently devise, develop or otherwise create ideas or other
concepts for services or new products which are patentable or otherwise capable
of receiving protection from duplication.  In such event, Owner shall have the
right to apply for a patent in accordance with applicable law, provided,
however, that notwithstanding this subsection, Vendor does not hereby relinquish
or release any of its intellectual property rights.

          SECTION 14. SOFTWARE AND EQUIPMENT CHANGES

          14.1  Software.
                --------

          14.1.1  Software Upgrades, Software Maintenance Releases, Software
                  ----------------------------------------------------------
Enhancements and Combined Releases.  During the Contract Term, Owner shall
----------------------------------
receive all base Software releases and all Software Maintenance Releases,
Software Upgrades, Software Enhancements and Software Combined Releases
applicable to Software for Products for which Owner has obtained a RTU License
at such times as they become generally available to Vendor's customers.  Owner
shall also be entitled to receive Optional Software Features upon payment of the
appropriate fees determined in accordance with Exhibit A05. Owner may elect to
purchase such Optional Software Features on a per feature basis, or purchase
annual buy-out rights on a per market basis, permitting Owner to select those
features it wishes to deploy in the relevant market.  During the Contract Term,
Vendor will use commercially reasonable efforts to work jointly with Owner and
Owner's third party equipment or service suppliers with respect to the
integration of such third party's equipment or services with Owner's System(s).

          14.1.2  Notice.  Vendor shall give Owner, or cause Owner to be given
                  ------
not less than ninety (90) days prior written notice of the introduction of any
Software Enhancement release or any Software Combined Release or any optional
Software release. In addition, in each February and August of each year during
the term of this Contract, Vendor shall provide, or cause to be provided, to
Owner a forecast of future Software Enhancement releases, Software Upgrades, or
Software Combined Releases or any optional Software release, as the case may be,
then currently being developed by or on behalf of Vendor.

          14.1.3  Installation, Testing and Maintenance.  The installation and
                  -------------------------------------
testing of the Software by Vendor and the acceptance thereof by Owner shall be
performed in accordance with the criteria set forth in Exhibits L and O.

                                       35
<PAGE>

          14.1.4  Software Fixes.  In the event that any Software Maintenance
                  --------------
Release, Software Upgrade, Software Enhancement or Software Combined Release
supplied by Vendor during the term of this Contract has the effect of preventing
any System or any part thereof from satisfying, or performing in accordance with
the Specifications or the Exhibits or otherwise adversely affects the
functionality or features of any System or any part thereof, then Vendor shall
promptly retrofit or take such other corrective action as may be necessary to
ensure that any System or any such affected part, as modified to include each
such Software Maintenance Release, Software Upgrade, Software Enhancement or
Software Combined Release, shall satisfy, and perform in accordance with, the
Specifications and the Exhibits and restore all pre-existing functionality and
features as well as provide any new features and functionality provided by any
of the foregoing modifications, in each case without any charge to Owner (other
than payment of the applicable fees pursuant to the terms of this Contract).
Notwithstanding anything contained herein in this subsection to the contrary,
Owner shall be responsible for the cost of any additional Equipment required to
accommodate additional capacity, memory or processing requirements necessitated
by any new Software feature or Optional Software Feature which Owner elects to
use (provided such use by Owner is optional without losing the benefit of the
Software Maintenance Release or Software Upgrade) which are contained in any
such Software Upgrade, Software Enhancement or Software Combined Release;
provided, however, that Owner shall not be required to pay for any additional
Equipment required to accommodate additional capacity, memory or processing
requirements necessitated by implementation of a required Software Maintenance
Release, whether or not such Software Maintenance Release is issued as a stand-
alone release, or is contained within a Software Upgrade, Software Enhancement
or Software Combined Release.

          14.2  Equipment.
                ---------

          14.2.1  Equipment Upgrades.  (a)  Equipment Upgrades will be provided
                  ------------------
to Owner by Vendor at no charge to Owner as provided in subsection 14.2.1(b)
below. Equipment Enhancements must be provided to Owner by Vendor, if requested
by Owner, and Owner is obligated to make payment therefor in an amount that is
specified on Exhibit A04.  If Vendor at any time issues an Equipment Upgrade
which is combined with any Equipment Enhancement (collectively, the "Equipment
                                                                     ---------
Combined Release") to such Equipment, the Equipment Combined Release will be
----------------
provided at no charge to Owner unless and until Owner uses any of the Equipment
Enhancements included within the Equipment Combined Release, provided such use
by Owner of such Equipment is optional without losing the benefit of the
Equipment Upgrade.

          (b)  (i) After a Product has been shipped to Owner, if Vendor issues
an Equipment Upgrade or Equipment Enhancement, or where a modification to
correct an error in field documentation is to be introduced, Vendor will
promptly notify Owner of such change through Vendor's design change management
system or another Vendor notification procedure. Each change notification,
whether or not it bears a restrictive legend, will be subject to the
confidentiality obligations provided in subsection 26.18, except that such
information may be reproduced by Owner for Owner's use as required within the
System. If Vendor has engineered, furnished, and installed a Product which is
subject to an Equipment

                                       36
<PAGE>

Upgrade, Vendor will implement such change, at its sole cost and expense, if it
is announced within [*] for the Switch and [*] for all other Products from the
date of shipment of that Product, and subject to the reasonable review and
acceptance of Owner at such times as Owner reasonably determines that it needs
to review such Vendor decision, by either (A) modifying the Product at Owner's
site; (B) modifying the Product which Owner has returned to Vendor in accordance
with Vendor's reasonable instructions pursuant to and in accordance with the
terms of this Contract; or (C) replacing the Product requiring the change with a
replacement Product for which such change has already been implemented. If
Vendor has not engineered the original Product application and accordingly
office records are not available to Vendor, Vendor will provide the generic
change information and associated parts for Owner's use in implementing such
change.

          (ii)  In any of the instances described in clause (i) above, if Vendor
and Owner agree that a Product or part thereof subject to such change is readily
returnable, without incurring any significant time or expense, Owner, at its
expense, will remove and return such Product or part to Vendor's designated
facility within the United States and Vendor, at its sole expense, will
implement such change (or replace it with a Product or part for which such
change has already been implemented) at its facility and return such changed (or
replacement) Product or part at its sole cost and expense to Owner's designated
location within the United States. Any such reinstallation of Products which
were readily returnable will be performed by Owner at its sole expense, provided
such reinstallation can be done by Owner without incurring any significant time
or expense. In all other circumstances, Vendor shall provide such removal,
repair and reinstallation Services at its sole cost and expense.

          (iii) If Owner does not make or permit Vendor to make an Equipment
Upgrade as stated above within the appropriate [*] or [*] period from the date
of change notification or such other period as Vendor may agree, subsequent
changes, repairs or replacements affected by the failure to make such change
may, at Vendor's option, be invoiced to Owner whether or not such subsequent
change, repair or replacement is covered under the warranty provided in this
Contract for such Product. If requested by Owner, Equipment Upgrades announced
more than the appropriate [*] or [*] period from the date of shipment will be
implemented at Owner's expense.

          (iv)  If Vendor issues an Equipment Enhancement after a Product has
been shipped to Owner, Vendor will promptly notify Owner of such change if it is
being offered to any of Vendor's customers. Except as otherwise set forth above
in subsection 14.2.1(b), when an Equipment Enhancement is requested by Owner,
the pricing set for such Equipment Enhancements will be at Vendor's standard
charges subject to the applicable discounts set forth in Exhibit A01.

          (v)  All change notifications for Equipment Upgrades and Equipment
Enhancements provided by Vendor to Owner pursuant to the terms of this Contract
must contain the following information: (A) a detailed description of the
change; (B) the reason for the change; (C) the effective date of the change; and
(D) the implementation schedule for such change, if appropriate.

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       37
<PAGE>

          14.2.2  Notice.  Vendor shall give, or shall cause to be given to,
                  ------
Owner not less than ninety (90) days prior written notice of the introduction
of any Equipment Enhancement or any Equipment Combined Release. In addition, in
each February and August of each year during the Contract Term, Vendor shall
provide Owner with a forecast of future Equipment Enhancements to the Equipment
or Equipment Combined Releases then currently being developed by or on behalf of
Vendor.

          14.2.3  Installation, Testing and Acceptance.  The Installation and
                  ------------------------------------
testing of the Equipment by Vendor and the acceptance thereof by Owner shall be
performed in accordance with the Exhibits and pursuant to the Milestones
contained in the Exhibits.

          14.2.4  Equipment Fixes.  In the event that any Equipment Upgrade or
                  ---------------
Equipment Enhancement, directly or indirectly, supplied by Vendor during the
appropriate [*] or [*] period following the Effective Date or during the [*]
period following the date of shipment of such Equipment Upgrade or Equipment
Enhancement, has the effect of preventing any System or any part thereof from
satisfying, or performing in accordance with, the Specifications or otherwise
adversely affects the functionality, interoperability or features of any System,
or any part thereof then Vendor shall without any charge to Owner promptly
retrofit or take such other corrective action as may be necessary to assure that
any System or any such affected part, as modified to include each such Equipment
Upgrade and Equipment Enhancement, shall satisfy, and perform in accordance
with, the Specifications and restore all pre-existing functionality and features
as well as provide any features and functionality provided by any of the
foregoing modifications.

          14.2.5  Equipment Backwards Compatibility Warranty. Vendor represents
                  ------------------------------------------
and warrants (the "Equipment Backwards Compatibility Warranty") that each New
                   ------------------------------------------
Equipment Release will be Backwards Compatible, provided that it is implemented
within the specified time provided with each New Equipment Release.  [***]

          14.2.6  3G1X.  Vendor commits to deliver 1xRTT voice Hardware and
                  ----
Software on or before [*]. Vendor plans on making 3xRTT voice Software available
in the [*]. Such 1xRTT and 3xRTT Software will address the following key
aspects:

     i.   Provide new and innovative data services implemented over packet data
          network with CDMA,

    ii.   Support requirements for the deployment of high-speed wireless data
          offerings with increased RF capacity, and

   iii.   Support the deployment of advanced wireless service offerings.

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       38
<PAGE>

          14.2.7  System Capacity Guarantee. Vendor guarantees embedded sector
          ---------------------------------
erlang capacity according to the following table ("Capacity Guarantee").

[***]

     Vendor's Capacity Guarantee as set forth above is based on the following
parameters:

     1.  [***]

     2.  Vendor must have performed RF Design and RF Optimization for each
         cluster within such System.

     3.  The applicable Switch and BSC for such System must be loaded with
         Vendor's recommended datafill.

     4.  User traffic within each cluster must be uniformly distributed.

     5.  Owner has deployed Vendor's half-rate paging within such System.

     6.  [***]

     7.  [***]

     8.  [***]

     9.  MCTA must be configured for balanced loading.

     10. The Capacity Guarantee is based on Erlang B tables.

          14.2.8  1xEV.  Vendor plans to develop and provide to Owner technology
                  ----
commonly referred to as 1xEV, or an equivalent CDMA based technology of a
published standard that has gained industry market acceptance and is capable of
the effective data rate and network capacity standards as stated in the
finalized publication of 1xEV.

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       39
<PAGE>

          14.3  Notice of Developments.
                ----------------------

          14.3.1  Vendor Developments.  Vendor shall provide Owner, or cause to
                  -------------------
be provided to Owner, through Owner's chief technical officer (or in the absence
of such officer, to Owner's chief executive officer), with reasonable written
notice of any Product developments, innovations and/or technological advances
(collectively "Vendor Developments") relevant to the System simultaneous to
               -------------------
giving such notice to any other customer or otherwise making any such Vendor
Development public; provided that Vendor shall not be obligated to provide Owner
                    -------- ----
such notice before any other customer if doing so would breach any contractual
obligation to any other customer, provided further that any such notice need not
include any information originated by another customer of Vendor which is
proprietary to such other customer of Vendor. For the purposes of this
subsection the term "Vendor" includes Vendor and its affiliates and
subsidiaries.

          14.3.2  Participation in Testing.  Owner has the right, but not the
                  ------------------------
obligation, to witness and/or participate in any initial testing of Vendor
Developments; provided that any such initial testing of Vendor Developments
              -------- ----
shall be subject to (i) scheduling as reasonably determined by Vendor, (ii) the
qualification that Owner's System meets the technical requirements for the
testing of such Vendor Development as reasonably determined by Vendor (or
otherwise that Owner is willing to update such System to meet such
requirements), (iii) Owner's acknowledgment that it shall be able to provide the
resources necessary to implement the initial testing for such Vendor
Development, and (iv) Owner and Vendor executing a verification office testing
agreement that identifies the scope, terms, pricing, responsibilities and
schedule related to the initial testing of such Vendor Development.  Vendor
shall provide Owner at least thirty (30) days' prior written notice of its
intent to test any such Vendor Development and upon Owner's written request
Vendor shall allow Owner to participate in such testing upon terms and in a
testing environment reasonably acceptable to the parties at such time.  Such
rights shall not apply to a Vendor Development originated by another customer of
Vendor which includes information which is proprietary to such other customer.

          14.3.3  Quarterly Notices.  Vendor shall make reasonable efforts to
                  -----------------
collect and distribute on a quarterly basis a list of new Software bugs,
problems, fixes, etc., provided that Vendor shall not be required to distribute
confidential information of any other customer.

          SECTION 15.  INTELLECTUAL PROPERTY

          15.1  Intellectual Property.  Neither Owner nor Vendor shall publish
                ---------------------
or use any advertising, sales promotion, press releases or publicity matters
relating to this Contract without the prior written approval of the other, in
accordance with Section 26.13.

          15.2  Infringement.  (a) Vendor agrees that it shall defend,
                ------------
indemnify and hold harmless, at its own expense, all suits and claims against
Owner, Affiliates and Related

                                       40
<PAGE>

Operators, and the respective officers, directors, employees and affiliates of
each of the foregoing (collectively, the "Owner Indemnified Parties"), for
                                          -------------------------
infringement or violation of any patent, trademark, copyright, trade secret or
other intellectual property rights of any third party enforceable in the United
States or in any other territory where Vendor has approved the deployment or use
of Products under this Contract (collectively, "Intellectual Property Rights"),
                                                ----------------------------
covering, or alleged to cover, the Products or any component thereof. Vendor
agrees that it shall pay all sums, including without limitation, reasonable
attorneys' fees and other costs incurred at Vendor's written request or
authorization, which, in defense of, by final judgment or decree, or in
settlement of any suit or claim to which Vendor agrees, may be assessed against,
or incurred by, any of the Owner Indemnified Parties on account of such
infringement or violation, provided that the Owner Indemnified Parties involved
shall cooperate in all reasonable respects with Vendor and its attorneys in the
investigation, trial and defense of such lawsuit or action and any appeal
arising therefrom; provided, however, that the Owner Indemnified Parties may, at
their own cost, participate in the investigation, trial and defense of such
lawsuit or action and any appeal arising therefrom. The parties shall cooperate
with each other in any notifications to insurers. If a claim for Losses (a
"Claim") is to be made by a party entitled to indemnification hereunder against
 -----
Vendor, the party claiming such indemnification shall give written notice (a
"Claim Notice") to Vendor as soon as practicable after the party entitled to
 ------------
indemnification becomes aware of any fact, condition or event which may give
rise to Losses for which indemnification may be sought under this Contract,
provided, however, no delay on the part of the Owner Indemnified Parties in
notifying Vendor shall relieve Vendor from any obligation hereunder unless (and
then solely to the extent) Vendor is thereby materially prejudiced. If any
lawsuit or enforcement action is filed against any party entitled to the benefit
of indemnity hereunder, written notice thereof shall be given to Vendor as
promptly as practicable (and in any event within fifteen (15) calendar days
after the service of the citation or summons). Vendor shall be entitled, if it
so elects, (i) to defend such lawsuit or action, (ii) to employ and engage
attorneys of its own choice to handle and defend the same, at Vendor's cost,
risk and expense, and (iii) to compromise or settle such Claim, which compromise
or settlement shall be made only with the written consent of the Owner
Indemnified Parties involved (which may not be unreasonably withheld), unless
such compromise or settlement includes an unconditional release of any claims
against the Owner Indemnified Parties in which event such written consent of the
Owner Indemnified Parties shall not be required. If Vendor fails to assume the
defense of such Claim within fifteen (15) calendar days after receipt of the
Claim Notice, the Owner Indemnified Parties against which such Claim has been
asserted will (upon delivering notice to such effect to Vendor) have the right
to undertake, at Vendor's cost and expense, the defense, compromise or
settlement of such Claim on behalf of and for the account and risk of Vendor. In
the event an Owner Indemnified Party assumes the defense of the Claim due to the
Vendor's failure to assume the defense of such claim within fifteen (15)
calendar days, such Owner Indemnified Party will keep Vendor reasonably informed
of the progress of any such defense, compromise or settlement. Vendor shall be
liable for any settlement of any action effected pursuant to and in accordance
with this Contract and for any final judgment (subject to any right of appeal),
and Vendor agrees to indemnify and hold harmless the Owner Indemnified Parties
from and against any Losses by reason of such settlement or judgment.

                                       41
<PAGE>

     (b)   Vendor's obligation under this subsection shall not extend to alleged
infringements or violations that arise because the Products provided by Vendor
are used in combination with other products furnished by third parties and where
any such combination was not installed, recommended or approved by Vendor.

     15.3  Vendor's Obligation to Cure.  If in any such suit so defended, all or
           ---------------------------
any part of the Products or any component thereof is held to constitute an
infringement or violation of Intellectual Property Rights of others and its use
is enjoined, or if in respect of any claim of infringement or violation Vendor
deems it advisable to do so, Vendor shall at its sole cost, expense and option
take one or more of the following actions:  (i) procure the right to continue
the use of the same without interruption for Owner and any Affiliates and
Related Operators; (ii) replace the same with non-infringing Products that meets
the Specifications in accordance with the terms of this Contract; or (iii)
modify said Products, any System or any component thereof so as to be non-
infringing, provided that the Products, any System or any component thereof as
modified meets all of the Specifications.  In the event that Vendor is not able
to cure the infringement pursuant to clause (i), (ii) or (iii) in the
immediately preceding sentence, in addition to the other rights and remedies
provided in this Section 15, Vendor shall refund to Owner (or Affiliate or
Related Operator that have placed Purchase Orders under this Contact) the full
purchase price paid by Owner (or Affiliate or Related Operator) for such
infringing Product or feature, and Owner (or such Affiliate or Related Operator)
shall return to Vendor such infringing Product or feature; provided that, Vendor
shall only be obligated to refund such purchase price for a period (from the
effective date of the Contract) of [*] for Switch related Products and [*] for
other Products. For those infringing Products not readily returnable by Owner,
or where Owner cannot de-install and remove such infringing Products without
incurring significant time and expense, Vendor shall, at its expense, de-install
and remove such infringing Products.

     15.4  Exclusions From Vendor's Obligations. Vendor's obligations under this
           --------------- --------------------
Section 15 shall not apply to any infringement or violation of Intellectual
Property Rights that is caused by unauthorized modification of the Products, any
System or any component thereof by Owner or infringement that arises from use or
combination of the Products with other products not supplied or approved by
Vendor, or that arises from adherence to instructions to apply Owner's
trademark, trade name or other company identification to a Product, or any
infringement caused solely by Owner's use and maintenance of the Products other
than in accordance with the Specifications, except as authorized or permitted by
Vendor.  Owner shall indemnify Vendor against all liabilities and costs,
including reasonable attorneys' fees, for defense and settlement of any and all
claims against Vendor for Owner's (and Affiliate's and Related Operator's)
infringements or violations described in this subsection.

     15.5  Infringement Related To OEM Equipment.  Vendor shall have no
           -------------------------------------
liability whatsoever for any patent, copyright or any other intellectual
property right infringement arising from Owner's use of OEM Equipment, and
Vendor makes no express or implied warranty of non-infringement with respect
thereto. In the event of an

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       42
<PAGE>

infringement claim by a third party alleging infringement of patent, trademark,
copyright or violation of trade secrets or proprietary rights because of, or in
connection with, OEM Equipment furnished pursuant to this Contract, Vendor shall
attempt to assign any of its indemnity rights for such infringement claim to
Owner. If Vendor is unable to assign such indemnity rights to Owner, Vendor
shall enforce its indemnity rights against the applicable OEM Equipment supplier
and pass through indemnity amounts to which Vendor and/or Owner is entitled, and
in such event Owner agrees to comply with any commercially reasonable
obligations required by the OEM Equipment supplier in order for Vendor to
enforce such rights.

     15.6  Liability of Vendor.  The liability of Vendor with respect to any and
           -------------------
all claims, actions, proceedings or suits by third parties alleging infringement
of patents, trademarks, or copyrights or violation of trade secrets or
proprietary rights because of, or in connection with, any items furnished
pursuant to this Contract shall be limited to the specific undertakings
contained in this Section 15 and Section 20 of this Contract.

     SECTION 16.  DELAY

     16.1  Liquidated Damages.   The parties agree that damages for delay are
           ------------------
difficult to calculate accurately and not reasonably determinable at the time of
execution of this Contract, and, therefore, agree that liquidated damages (the
"Liquidated Damages") shall be paid for non-performance or late performance of
-------------------
Vendor's obligations to achieve a Guaranteed Substantial Completion Date, to
satisfy the Capacity Guarantee, or for Major Outages as described below, for
reasons not otherwise excused by Force Majeure or Owner's failure to satisfy its
obligations set out in this Contact.  The parties agree that Liquidated Damages
are intended to compensate Owner for the delayed or late performance by Vendor
and are not a penalty.

     16.2  Delay and Default for Substantial Completion.  In the event Vendor
           --------------------------------------------
fails to achieve (other than as permitted by this Contract) the Substantial
Completion of a System on or before the Guaranteed Substantial Completion Date
for such System or during a ten day cure period following such date, Vendor
shall pay [*] in arrears, commencing on the [*] after the Guaranteed Substantial
Completion Date, Liquidated Damages to Owner in an amount equal to [*] (pro-
rated on a daily basis for periods of time less than one week) of the total
amount of all Purchase Orders relating to the System with respect to which
Vendor has so failed, until the achievement of Substantial Completion; provided
that, in no event shall the amount of Liquidated Damages so paid in respect to
failure to achieve Substantial Completion of a System as set forth above exceed
[*] of the total amount of all Purchase Orders relating to the System with
respect to which Vendor has so failed.

     16.3  Major Outage Damages.  In the event that Vendor is delayed in
           --------------------
achieving Final Acceptance by greater than [*] from the applicable Guaranteed
Substantial Completion Date, or such later date as the parties may agree upon,
for reasons solely (as such term is defined in the definition of Major Outage)

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       43
<PAGE>

attributable to Vendor, and a Major Outage occurs after such period of time and
prior to Final Acceptance, Vendor shall be liable to Owner [*] in an amount
equal to [*] of the total amount of all Purchase Orders relating to the System
with respect to which Vendor has so failed for each Major Outage that occurs
during such time period, as Liquidated Damages; provided, however, that the
Liquidated Damages so paid in respect to this subsection shall not cumulatively
exceed a total of [*] of the net price of the Purchase Orders related to the
System so affected. The payment of Liquidated Damages in the form of purchase
credits as described herein constitutes Owner's sole and exclusive remedy in the
event of a Major Outage as described herein.

     16.4  System Capacity Guarantee Remedy. [***]
           --------------------------------

     16.5  Limitation.  The foregoing provisions concerning Liquidated Damages
           ----------
shall not be deemed to limit the amount payable by Vendor to Owner for breach of
contract or in tort, except for amounts payable on account of delay as
aforesaid, provided, however

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       44
<PAGE>

that the payment of Liquidated Damages shall be Owner's sole remedy for delays
giving rise to the Vendor's obligation to pay Liquidated Damages.

     16.6  Early Completion Bonus.  With respect to a System, Vendor shall be
           ----------------------
entitled to an early completion bonus from the Owner in the event that
Substantial Completion with respect to such System occurs on or prior to the
date that is [*] prior to the Guaranteed Substantial Completion Date for such
System.  Such early completion bonus shall be equal to [*] (pro-rated on a daily
basis for periods of time less than one week) of the total amount of all
Purchase Orders relating to such System, based on the number of days that
Substantial Completion occurs prior to the date that is [*] prior to the
Guaranteed Substantial Completion Date for such System.

     16.7  Purchase Credits.  Purchase credits provided to Owner under this
           ----------------
Contract shall not be used by Owner towards OEM Equipment or Services. Any
purchase credits provided to Owner under this Contract shall not reduce the
total price of any Purchase Order by more than [*]. Purchase credits not used
within [*] from the date such purchase credits arose shall be forfeited and
shall have no cash value, provided, however, that (i) in the event Owner has not
used all of the purchase credits on or prior to [*] prior to the expiration of
the Contract, Owner may increase its ability to reduce the total price of any
subsequent Purchase Order by an additional [*] (i.e., for a cumulative reduction
of the total value of such Purchase Orders by an amount not to exceed [*]). In
the event Owner has not used all of the purchase credits on or prior to the
termination or expiration of the Contract, for a period of [*] from the date of
such termination or expiration, Owner may offset such purchase credits against
any RTU License fees.

     SECTION 17.  FORCE MAJEURE

     17.1  Excusable Delay.  (a) If the performance of this Contract, or of any
           ---------------
obligation hereunder except for the obligations set forth in Section 5 is
prevented, restricted or interfered with by reason of fires, breakdown of plant,
labor disputes, embargoes, government ordinances or requirements, civil or
military authorities, acts of God or of the public enemy, acts or omissions of
carriers, inability to obtain necessary materials or services from suppliers, or
other causes beyond the reasonable control of the party whose performance is
affected ("Force Majeure"), then the party affected, upon giving prompt notice
           -------------
to the other party, shall be excused from such performance on a day-for-day
basis to the extent of such prevention, restriction, or interference (and the
other party shall likewise be excused from performance of its obligations on a
day-for-day basis to the extent such party's obligations relate to the
performance so prevented, restricted or interfered with); provided that the
party so affected shall use reasonable efforts to avoid or remove such cause of
non-performance and both parties shall proceed to perform their obligations with
dispatch whenever such causes are removed or cease.

     (b)  The party claiming the benefit of excusable delay hereunder shall
(i)promptly notify the other party of the circumstances creating the failure or
delay and
[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       45
<PAGE>

provide a statement of the impact of such party failure or delay and (ii) use
reasonable efforts to avoid or remove such causes of nonperformance, excusable
failure or delay. If an event of Force Majeure prevents Vendor from performing
its obligations under this Contract for a period exceeding sixty (60) days,
Owner may, upon prior written notice to the other party, terminate this
Contract.

     (c)  In the event of a Force Majeure which the party claiming relief for
such event has used all best commercially reasonable efforts to resolve in
accordance with the terms of this Contract, upon the written request of either
party, the other party shall in good faith negotiate modifications, to the
extent reasonable and necessary, in scheduling and performance criteria in order
to reasonably address the impact of such Force Majeure.

     SECTION 18.  WARRANTIES

     18.1  Equipment and Services Warranty.  Vendor warrants that, with
           -------------------------------
respect to each System, for a period of [*] from the date of Substantial
Completion, provided, however that if prior to Final Acceptance a Major Outage
occurs, the [*] period shall be extended by the number of days elapsed between
Substantial Completion and the date Owner signs the Certificate of Final
Acceptance (as so determined, the "Warranty Period"), all Equipment and Services
                                   ---------------
furnished under this Contract with respect to such System will be free of
Defects and Deficiencies and shall conform to the applicable portions of the
Specifications (the "Equipment and Services Warranty"), provided, however, that
                     -------------------------------
with respect to those Services for which a warranty is set forth in an Exhibit,
the warranty contained in the Exhibit shall supersede the general Services
warranty contained in this Section 18.1. With respect to OEM Equipment, Vendor
shall furnish such Products only on a pass-through warranty basis; provided,
however, that Vendor shall identify such Products to Owner before acceptance of
any Purchase Order which includes any such Products. The terms of the warranty
applicable to such Products shall be provided in an addendum to the Purchase
Order. Except as noted in Exhibit T2, all Products referenced in Exhibit T2
qualify as Vendor-warranted Products. Vendor's obligations with respect to the
Equipment and Services Warranty shall be to attempt first to repair or replace
at no additional cost, any defective Equipment or correct any deficient
Services. If, after using its best commercially reasonable efforts to repair or
replace such Product and after consultation with and with the consent of Owner,
which consent shall not be unreasonably withheld, Vendor determines that it is
unable to repair, replace or otherwise correct such defect, Vendor shall provide
a credit or refund based on the original purchase price, and installation
charges if installed by Vendor. If, as a result of the Defect and Deficiency,
the Product fails to operate in accordance with the Specifications which causes
the System to fail to materially operate in accordance with its Specifications,
a refund shall be paid to Owner on account of the purchase price for the total
System, less a pro-rata discount calculated with regard to the period of time
during the Warranty Period that Owner operated the System in In Revenue Service.
For purposes of calculating such pro rata discount, the period of time Owner
would have been able to operate the System in In Revenue Service shall be [*]
from Substantial Completion for the Switch and [*] from Substantial Completion
for all other Products. In the event that Vendor pays a refund

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       46
<PAGE>

hereunder, Owner shall return such Products to Vendor at Vendor's sole cost and
expense. The Warranty Period for all Equipment or Services repaired, replaced or
corrected under the Equipment and Services Warranty shall be the longer of [*]
from the date of delivery of the repaired or replacement Equipment or from the
completion of the corrected Services, as applicable, or (ii) or the unexpired
term of the Warranty Period. The Warranty Period for Equipment purchased as
spares shall be [*] from installation of such Equipment.

     For those Products not readily returnable by Owner, or where Owner cannot
remove and reinstall the Products without incurring significant time and
expense, and where Vendor elects to repair or replace the Product, Vendor shall
repair or replace the Product at Owner's Site.  In the event Vendor does the
repair work at Owner's site, Vendor shall be responsible for replacement of
cable and wire Products, and for reasonable Site restoration.  If Vendor has
elected to repair or replace a defective Product, and the Product is readily
returnable by Owner without incurring significant work or expense, Owner is
responsible for removing and reinstalling the Products.  Products returned for
repair or replacement will be accepted by Vendor only in accordance with its
instructions and procedures for such returns.  The transportation expense
associated with returning such Product to Vendor shall be borne by Owner.
Vendor shall pay the cost of transportation of the repaired or replacing Product
to the return destination designated by Owner.  Defective or nonconforming
Products or parts which are replaced hereunder shall become Vendor's property.
Vendor may use either the same or functionally equivalent new, remanufactured,
reconditioned or refurbished Products or parts in the furnishing of repairs or
replacements under this Contract, provided that such Products satisfy the
Specifications.

     18.2  Expansions Warranty.  Vendor warrants that, with respect to Products
           -------------------
and Services constituting Expansions (including Expansions to a System, or
Expansions or growth not part of a System, and all other purchased Products)
furnished under this Contract will be free of Defects and Deficiencies and shall
conform the applicable portions of the Specifications (the "Expansions
                                                            ----------
Warranty").  The warranty period with respect to such Products and Services
--------
shall be [*] from the date of installation completion or completion of Services,
as the case may be (the "Expansions Warranty Period").  With respect to OEM
                         --------------------------
Equipment, Vendor shall furnish such Products only on a pass-through warranty
basis; provided, however, that Vendor shall identify such Products to Owner
before acceptance of any Purchase Order which includes any such Products. The
terms of the warranty applicable to such Products shall be provided in an
addendum to the Purchase Order. Except as noted in Exhibit T2, all Products
referenced in Exhibit T2 qualify as Vendor-warranted Products. Vendor's
obligations with respect to the Expansions Warranty shall be to attempt first to
repair or replace at no additional cost, any defective Equipment or correct any
deficient Services. If, after using its best commercially reasonable efforts to
repair or replace such Product and after consultation with and with the consent
of Owner, which consent shall not be unreasonably withheld, Vendor determines
that it is unable to repair, replace or otherwise correct such defect, Vendor
shall provide a credit or refund based on the original purchase price, and
installation charges if installed by Vendor. The warranty period for all
Equipment or Services repaired, replaced or corrected under the

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       47
<PAGE>

Expansions Warranty shall be the longer of one (1) year from the date of
delivery of the repaired or replacement Equipment or from the completion of the
corrected Services, as applicable, or (ii) or the unexpired term of the
Expansions Warranty Period. The Warranty Period for Equipment purchased as
spares shall be [*] from shipment of such Equipment.

     For those Products not readily returnable by Owner, or where Owner cannot
remove and reinstall the Products without incurring significant time and
expense, and where Vendor elects to repair or replace the Product, Vendor shall
repair or replace the Product at Owner's Site.  In the event Vendor does the
repair work at Owner's site, Vendor shall be responsible for replacement of
cable and wire Products, and for reasonable Site restoration.  If Vendor has
elected to repair or replace a defective Product, and the Product is readily
returnable by Owner without incurring significant work or expense, Owner is
responsible for removing and reinstalling the Products.  Products returned for
repair or replacement will be accepted by Vendor only in accordance with its
instructions and procedures for such returns.  The transportation expense
associated with returning such Product to Vendor shall be borne by Owner.
Vendor shall pay the cost of transportation of the repaired or replacing Product
to the return destination designated by Owner.  Defective or nonconforming
Products or parts which are replaced hereunder shall become Vendor's property.
Vendor may use either the same or functionally equivalent new, remanufactured,
reconditioned or refurbished Products or parts in the furnishing of repairs or
replacements under this Contract, provided that such Products satisfy the
Specifications.

     18.3  Software Warranty.  Vendor warrants that, with respect to each System
           -----------------
for the Warranty Period, all Software will be free of Defects and Deficiencies
and shall conform to the applicable portions of the Specifications (the
"Software Warranty").  Vendor's obligations with respect to the Software
------------------
Warranty shall be to attempt first to repair or replace at no additional cost,
any defective Software.  If, after using its best commercially reasonable
efforts to repair or replace such Software and after consultation with and with
the consent of Owner, which consent shall not be unreasonably withheld, Vendor
determines that it is unable to repair, replace or otherwise correct such
defect, Vendor shall provide a credit or refund based on the original purchase
price, and installation charges if installed by Vendor. If, as a result of the
Defect and Deficiency, the Software fails to operate in accordance with the
Specifications which causes the System to fail to materially operate in
accordance with its Specifications, a refund shall be paid to Owner on account
of the purchase price for the total System, less a pro rata discount calculated
with regard to the period of time during the Warranty Period that Owner operated
the System in In Revenue Service. For purposes of calculating such pro rata
discount, the period of time Owner would have been able to operate the System in
In Revenue Service shall be [*] from Substantial Completion for the Switch and
[*] from Substantial Completion for all other Products. In the event that Vendor
pays a refund hereunder, Owner shall return such Products to Vendor. The
warranty period for all Software so corrected or replaced under the Software
Warranty shall be the longer of one (1) year from the date of delivery of the
repaired or replacement Software, or (ii) or the unexpired term of the Warranty
Period. Vendor shall be solely responsible for all costs and expenses incurred
by Owner or Vendor in connection with the de-installation, removal and
transportation of defective Software

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       48
<PAGE>

under the Software Warranty and for the transportation and installation of
repaired, corrected or replacement Software, including without limitation any
additional or upgraded Equipment or processing capability necessary to run or
operate such repaired, corrected or replacement Software. The Warranty Period
with respect to Software Maintenance Releases, Software Upgrades, Software
Enhancements and Software Combined Releases shall be [*] from the successful
installation of such Software Maintenance Releases, Software Upgrades, Software
Combined Releases and Software Enhancements.

     18.4  [intentionally deleted]

     18.5  Year 2000 Warranty. Vendor warrants that, notwithstanding any other
           ------------------
warranty provided to Owner pursuant to this Contract, during the period
commencing on the date that the applicable Software Warranty Period commences
and ending on January 1, 2004, the Software will (a) process calendar dates
falling on or after January 1, 2000, with substantially the same functionality
as such Software processes calendar dates falling on or before December 31,
1999, and (b) provide substantially the same functionality with respect to the
introduction of records containing dates falling on or after January 1, 2000, as
it provides with respect to the introduction of records containing dates falling
on or before December 31, 1999 (the "Year 2000 Warranty").  All of the foregoing
                                     ------------------
functionality shall be known as "Year 2000 Capability".  In the event Owner has
                                 --------------------
or purchases more than one version of Software, such versions of Software, if
they are intended by Vendor to interoperate, will be compatible and interoperate
in such manner as to process between them, as applicable, date related data
correctly as described herein.  All of the foregoing functionality shall be
known as "Year 2000 Interoperability".  The foregoing sets forth an additional
          --------------------------
warranted specification for Software developed by Vendor that Vendor has
identified as having Year 2000 Capability.  The failure of such Software to meet
such specification during the Year 2000 Warranty Period shall, to the extent the
Software remains then subject to warranty protection, entitle Owner to the
remedies set out in this section.  Nothing in the foregoing shall be deemed to
make Vendor responsible for the Year 2000 Capability or Year 2000
Interoperability of any third party software interoperating or intended to
interoperate with Software developed by Vendor.  Owner and or the manufacturer
or other supplier of such third party software shall be responsible for such
compliance and assuring the ability of such software to successfully operate
while interoperating with Software developed by Vendor.

     18.6  Warranty Claim Procedures.  (a)  If Owner claims a breach of any
           -------------------------
warranty, it shall notify Vendor of the claimed breach within a reasonable time
after its determination that a breach has occurred.  Owner shall allow Vendor to
inspect the Equipment, Software, Services, or the System, as the case may be,
on-site in order to effect the necessary repairs.

     (b)  Vendor shall respond to such warranty claims for warranty Services in
accordance with the procedures outlined in Exhibits T1 and T2.

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       49
<PAGE>

     18.7  Technical Assistance.  Vendor shall maintain a technical assistance
           --------------------
center and shall have technical support available to Owner in accordance with
the requirements set forth in Exhibit T1.

     18.8  Scope of Warranties.  Unless otherwise stated herein, the Warranties
           -------------------
shall not apply to:

     18.8.1  defective conditions or nonconformities to the extent resulting
  from the following, if not consistent with applicable Specifications:
  unauthorized Owner modifications, misuse, neglect, accident, abuse, improper
  wiring, repairing, splicing, alteration, installation, storage, maintenance or
  failure of Owner to apply previously applicable Vendor modifications or
  corrections;

     18.8.2  any Equipment, Services or Software damaged by accident or
  disaster, including without limitation, fire, flood, wind, water, lightning or
  power failure other than to the extent that any such Equipment, Services or
  Software should in accordance with the Specifications be able to withstand any
  such events; or

     18.8.3  non-integral items normally consumed in operation or which has a
  normal life inherently shorter than the Warranty Periods (e.g., fuses, lamps,
                                                            ----
  magnetic tape); or

     18.8.4  damages or defects resulting directly from third party equipment,
  provided that this shall in no event limit Vendor's obligations as to
  interoperability pursuant to the terms of this Contract;

     18.8.5  Equipment which have had their serial numbers or months and year of
  manufacture removed or obliterated by Owner; or

     18.8.6  failures or deficiencies in BTS performance or System optimization
  resulting solely from changed environmental conditions or unauthorized changes
  to the System by Owner, or changes not consented to by Owner including, but
  not limited to, the growth of trees and other foliage, the erection of
  buildings, and interference from third party radio transmissions not otherwise
  engineered for by Vendor;

except when any such damage or defects are made, done or caused by Vendor or any
of its Subcontractors, their respective agents and employees.

     18.9   Third Party Warranties.  If Vendor purchases or subcontracts for the
            ----------------------
manufacture of any part of a System or the performance of any of the Services to
be provided hereunder from a third party, the warranties given to Vendor by such
third party shall inure, to the extent assigned to Owner pursuant to this
Section 18 or permitted by law, to the benefit of Owner, and Owner shall have
the right, at its sole discretion, to enforce

                                       50
<PAGE>

such warranties directly and/or through Vendor. The warranties of such third
parties shall be in addition to and shall not, unless otherwise expressly stated
herein, be in lieu of any warranties given by Vendor under this Contract.

     18.10  Additional Sites.  In the event that under the remedy provisions of
            ----------------
this Section 18 Vendor is required to provide additional MSC and/or BTS's
requiring additional Sites, Owner shall be responsible for all Site Acquisition.

     18.11  EXCLUSIVE REMEDIES. THE FOREGOING EQUIPMENT, SERVICES, SOFTWARE AND
            ------------------
EXPANSIONS WARRANTIES AND REMEDIES ARE EXCLUSIVE FOR THE PURPOSES OF ANY BREACH
BY VENDOR OF ANY SUCH WARRANTY AND ARE IN LIEU OF ALL OTHER EXPRESS AND IMPLIED
WARRANTIES, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.

     SECTION 19.  INSURANCE

     19.1  Insurance.  Vendor shall maintain insurance in accordance with the
           ---------
provisions set forth in Exhibit C.

     SECTION 20.  INDEMNIFICATION AND LIMITATION OF LIABILITY

     20.1 Indemnity. Each party agrees to indemnify, defend and hold harmless
          ---------
the other party and its affiliates and their respective directors, officers,
employees, agents, successors and assigns, from Losses and threatened Losses
arising from, in connection with, or based on allegations of, any of the
following:

     (a)  failure to observe or perform any duties or obligations to
          Subcontractors or any third parties within the reasonable
          contemplation of this Contract;

     (b)  the death or bodily injury of any agent, employee, customer, business
          invitee or any other person caused by the negligence, willful
          misconduct or strict liability of such party, its subcontractor or its
          or their respective employees, contractors, agents or representatives;
          provided that, Owner shall have no liability for any act or omission
          of Vendor or any Subcontractor, and Vendor shall have no liability for
          any act or omission of Owner or any subcontractor of Owner that is not
          a Subcontractor of Vendor.

     (c)  the damage, loss or destruction of any real or tangible personal
          property caused by the negligence, willful misconduct or strict
          liability of such party, its subcontractor or its or their respective
          employees, contractors, agents or representatives; provided that,

                                       51
<PAGE>

               Owner shall have no liability for any act or omission of Vendor
               or any Subcontractor, and Vendor shall have no liability for any
               act or omission of Owner or any subcontractor of Owner that is
               not a Subcontractor of Vendor; or

          (d)  any claim, demand, charge, action, cause of action or other
               proceeding asserted against the other party but arising out of or
               resulting from an act or omission of such party, its
               subcontractor or its or their respective employees, contractors,
               agents or representatives in its or their respective capacities
               as an employer; provided that, Owner shall have no liability for
               any act or omission of Vendor or any Subcontractor, and Vendor
               shall have no liability for any act or omission of Owner or any
               subcontractor of Owner that is not a Subcontractor of Vendor.

          20.2   Claim for Losses. If a Claim is to be made by a party entitled
                 ----------------
to indemnification hereunder, the party claiming such indemnification shall give
a Claim Notice as soon as practicable after the party entitled to
indemnification becomes aware of any fact, condition or event which may give
rise to Losses for which indemnification may be sought under this Contract,
provided, however, no delay on the part of the party seeking indemnification
shall relieve the party against whom indemnification is sought from any
obligation hereunder unless (and then solely to the extent) such party is
thereby materially prejudiced.  If any lawsuit or enforcement action is filed
against any party entitled to the benefit of indemnity hereunder, written notice
thereof shall be given to the other party as promptly as practicable (and in any
event within fifteen (15) calendar days after the service of the citation or
summons).  The indemnifying party shall be entitled, if it so elects, (i) to
defend such lawsuit or action, (ii) to employ and engage attorneys of its own
choice to handle and defend the same, at such party's cost, risk and expense,
and (iii) to compromise or settle such Claim, which compromise or settlement
shall be made only with the written consent of the party claiming such
indemnification (which may not be unreasonably withheld), unless such compromise
or settlement includes an unconditional release of any and all claims against
the party claiming such indemnification in which event such written consent
shall not be required.  If the party against whom indemnification is sought
fails to assume the defense of such Claim within fifteen (15) calendar days
after receipt of the Claim Notice, the party claiming such indemnification
against which such Claim has been asserted will (upon delivering notice to such
effect) have the right to undertake, at the other party's expense, the defense,
compromise or settlement of such Claim on behalf of and for the account and risk
of the party against whom indemnification is sought.  In the event the party
claiming such indemnification assumes the defense of the Claim, such party will
keep the other party reasonably informed of the progress of any such defense,
compromise or settlement.  The indemnifying party shall be liable for any
settlement of any action effected pursuant to and in accordance with this
Contract and for any final judgment (subject to any right of appeal), and such
party agrees to indemnify and hold harmless the party claiming indemnification
from and against any Losses by reason of such settlement or judgment.

                                       52
<PAGE>

          20.3  Limitation On Vendor's Liability.  THE ENTIRE LIABILITY OF
                --------------------------------
VENDOR FOR ANY CLAIM, LOSS, DAMAGE OR EXPENSE OF OWNER OR ANY OTHER PERSON OR
ENTITY ARISING OUT OF THIS CONTRACT, OR THE USE OR PERFORMANCE OF ANY PRODUCT OR
SERVICE, WHETHER IN AN ACTION FOR OR ARISING OUT OF BREACH OF CONTRACT OR TORT,
INCLUDING NEGLIGENCE, INDEMNITY OR STRICT LIABILITY, SHALL BE EXPRESSLY SET
FORTH HEREIN AND AS FOLLOWS:

     1.   FOR INFRINGEMENT, THE REMEDIES SET FORTH IN SECTIONS 15, WHICH SHALL
          BE LIMITED TO AN AMOUNT EQUAL TO [*] OF THE AGGREGATE
          AMOUNT OF ALL PURCHASE ORDERS ISSUED UNDER THIS CONTRACT;

     2.   FOR THE NON-PERFORMANCE OF PRODUCTS OR SERVICES DURING THE WARRANTY
          PERIOD, THE REMEDIES SET FORTH IN THE APPLICABLE CLAUSE OF SECTION 18;

     3.   THE LIQUIDATED DAMAGES PROVIDED FOR THE FIRST SYSTEM UNDER THIS
          CONTRACT, SHALL NOT EXCEED THE AMOUNTS AS SET FORTH IN SECTION 16.
          THE LIQUIDATED DAMAGES PROVIDED IN SECTION 16 FOR ALL SYSTEMS UNDER
          THIS CONTRACT SHALL NOT EXCEED THE GREATER OF EITHER (i) THE AMOUNTS
          SET FORTH IN SECTION 16 WITH RESPECT TO THE FIRST SYSTEM, OR (ii) AN
          AMOUNT EQUAL TO [*] OF THE AGGREGATE AMOUNT OF ALL FULFILLED
          PURCHASE ORDERS WITH RESPECT TO ALL SYSTEMS; PROVIDED THAT FOR
          PURPOSES OF QUANTIFYING THE DAMAGES FOR A FAILURE TO SATISFY THE
          CAPACITY GUARANTEE, THE ADDITIONAL EQUIPMENT FURNISHED BY VENDOR AT NO
          CHARGE TO OWNER SHALL BE VALUED AT THE PRICES FOR SUCH EQUIPMENT SET
          FORTH IN THIS CONTRACT AND, AS SO VALUED, SHALL BE DEEMED TO BE
          DAMAGES FOR PURPOSES OF THIS SUBSECTION AND;

     4.   EXCEPT AS PROVIDED IN PARAGRAPH 5 BELOW, FOR EVERYTHING OTHER THAN AS
          SET FORTH ABOVE, VENDOR'S TOTAL LIABILITY TO OWNER, WHETHER IN
          CONTRACT OR IN TORT (INCLUDING BREACH OF WARRANTY, NEGLIGENCE AND
          STRICT LIABILITY) SHALL BE LIMITED TO AN AMOUNT EQUAL TO [*] OF THE
          AGGREGATE AMOUNT OF ALL PURCHASE ORDERS ISSUED UNDER THIS CONTRACT.

     5.   THE LIMITATION SET FORTH IN PARAGRAPH 4 ABOVE SHALL NOT APPLY WITH
          RESPECT TO (i) CLAIMS OF BREACH OF CONFIDENTIALITY, (ii) CLAIMS
          SUBJECT TO INDEMNIFICATION

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.

                                       53
<PAGE>

          PURSUANT TO SUBSECTION 20.1 ABOVE, OR (iii) FAILURE TO COMPLY WITH
          APPLICABLE LAWS.

          20.4  Limitation On Owner's Liability. THE ENTIRE LIABILITY OF OWNER
                ------------------------------
FOR ANY CLAIM, LOSS, DAMAGE OR EXPENSE OF VENDOR OR ANY OTHER PERSON OR ENTITY
ARISING OUT OF THIS CONTRACT, WHETHER IN AN ACTION FOR OR ARISING OUT OF BREACH
OF CONTRACT OR TORT, INCLUDING NEGLIGENCE, INDEMNITY OR STRICT LIABILITY, SHALL
BE EXPRESSLY SET FORTH HEREIN AND AS FOLLOWS

     1.   EXCEPT AS PROVIDED IN PARAGRAPH 2 BELOW, THE ENTIRE LIABILITY OF OWNER
          FOR ANY CLAIM, LOSS, DAMAGE OR EXPENSE OF VENDOR OR ANY OTHER PERSON
          OR ENTITY ARISING OUT OF THIS CONTRACT, WHETHER IN AN ACTION FOR OR
          ARISING OUT OF BREACH OF CONTRACT OR TORT, INCLUDING NEGLIGENCE,
          INDEMNITY OR STRICT LIABILITY, SHALL NOT EXCEED AN AGGREGATE OF
          [*].

     2.   THE LIMITATION SET FORTH IN PARAGRAPH 1 ABOVE SHALL NOT APPLY WITH
          RESPECT TO (i) CLAIMS OF BREACH OF CONFIDENTIALITY; (ii) OBLIGATIONS
          UNDER SECTION 13 BY OWNER, AFFILIATES OR RELATED OPERATORS; (iii)
          CLAIMS SUBJECT TO INDEMNIFICATION PURSUANT TO SUBSECTION 20.1 ABOVE;
          (iv)  FAILURE TO COMPLY WITH APPLICABLE LAWS; OR (v) PAYMENT
          OBLIGATIONS UNDER SECTIONS 2.1 AND 5.3 UNDER THIS CONTRACT.

          20.5 NOTWITHSTANDING ANY OTHER PROVISION OF THIS CONTRACT, NEITHER
PARTY, NOR THEIR AFFILIATES NOR THEIR EMPLOYEES, DIRECTORS, OFFICERS AND
SUPPLIERS SHALL BE LIABLE FOR THE OTHER PARTY'S INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOST PROFITS, REVENUES OR SAVINGS ARISING OUT OF THIS
CONTRACT OR THE USE OR PERFORMANCE OF ANY PRODUCTS OR SERVICES, EXCEPT EITHER
PARTY'S OBLIGATIONS RELATING TO CONFIDENTIALITY AND OWNER'S (OR AFFILIATE'S OR
RELATED OPERATOR'S) BREACH OF VENDOR'S SOFTWARE LICENSE AS SPECIFIED IN SECTION
13.  THIS CLAUSE SHALL SURVIVE FAILURE OF AN EXCLUSIVE OR LIMITED REMEDY.

          SECTION 21.  REPRESENTATIONS AND WARRANTIES

          21.1  Representations and Warranties of the Parties. The parties
                ---------------------------------------------
     hereby represent and warrant as follows:

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filied separately with the Securities and Exchange Commission.

                                       54
<PAGE>

          21.1.1  Due Organization. Each party represents and warrants to the
                  ----------------
     other party that the representing party is a corporation duly incorporated,
     validly existing and in good standing under the laws of the State of
     Delaware and has all requisite corporate power and authority to own and
     operate its business and properties and to carry on its business as such
     business is now being conducted and is duly qualified to do business in all
     jurisdictions in which the transaction of its business in connection with
     the performance of its obligations under this Contract makes such
     qualification necessary or required.

          21.1.2  Due Authorization; Binding Obligation. Each party represents
                  -------------------------------------
     and warrants to the other party that the representing party has full
     corporate power and authority to execute and deliver this Contract and to
     perform its obligations hereunder, and the execution, delivery and
     performance of this Contract by the representing party have been duly
     authorized by all necessary corporate action on the part of the party; this
     Contract has been duly executed and delivered by such party and is the
     valid and binding obligation of the party enforceable in accordance with
     its terms, except as enforcement thereof may be limited by or with respect
     to the following: (i) applicable insolvency, moratorium, bankruptcy,
     fraudulent conveyance and other similar laws of general application
     relating to or affecting the rights and remedies of creditors; (ii)
     application of equitable principles (whether enforcement is sought in
     proceedings in equity or at law); and (iii) provided the remedy of specific
     enforcement or of injunctive relief is subject to the discretion of the
     court before which any proceeding therefore may be brought.

          21.1.3  Non-Contravention. Each party represents and warrants to the
                  -----------------
     other party that the execution, delivery and performance of this Contract
     by the representing party and the consummation of the transactions
     contemplated hereby will not contravene its certificate of incorporation or
     by-laws and will not conflict with or result in (i) a breach of or default
     under any material indenture, mortgage, lease, agreement, instrument,
     judgment, decree, order or ruling applicable to it or by which it or any of
     its properties is bound or affected, or (ii) a breach by the representing
     party of any Applicable Law.

          21.1.4  Regulatory Approvals. Vendor represents and warrants to Owner
                  --------------------
     that all authorizations by, approvals or orders by, consents of, notices
     to, filings with or other acts by or in respect of any Governmental Entity
     or any other Person required in connection with the execution, delivery and
     performance of this Contract by Vendor have been obtained or shall be
     obtained in due course.

          21.1.5  Non-Infringement. Vendor represents and warrants to Owner that
                  ----------------
     to the best of Vendor's knowledge after reasonable investigation, as of the
     Effective Date there are no actual claims or threatened or actual suits in
     connection with patents or other Intellectual Property Rights that could
     materially adversely affect it's Vendor's ability to perform its
     obligations under this Contract.

                                       55
<PAGE>

          21.1.6  Requisite Knowledge. Vendor represents and warrants to Owner
                  -------------------
     that that Vendor has all requisite knowledge, know-how, skill, expertise
     and experience to satisfy its obligations in accordance with the terms of
     this Contract.

          21.1.7  Financial Capacity. Vendor represents and warrants to Owner
                  ------------------
     that Vendor has the financial, management and manufacturing capacity and
     capabilities to satisfy its obligations in a timely manner in accordance
     with the terms of this Contract.

          SECTION 22.  TITLE AND RISK OF LOSS

          22.1  Title. Title to Equipment shall pass to Owner upon delivery of
                -----
such Equipment to the location specified in the Exhibits. Owner consents without
qualification to the sale of receivables by Vendor without further notice and,
subject to the execution and delivery by the purchaser of such receivables of a
confidentiality and nondisclosure agreement satisfactory to Owner, such consent
not to be unreasonably withheld, permits the disclosure of this Contract and
Exhibits to the purchaser of the receivables as necessary to facilitate such
sale.

          22.2  Risk of Loss. Risk of loss or damage of any Products furnished
                ------------
to Owner in connection with this Contract shall pass from Vendor to Owner upon
the later of (i) delivery of such Products to the Sites; or, (ii) if Vendor is
responsible for Site Construction, the date of the Site Construction Substantial
Completion Certificate; provided that during the period a party has the risk of
loss or damage to an item, nothing in this section shall relieve the other party
of responsibility for loss or damage to the item resulting from the acts or
omissions of the other party, its employees, or agents.

          SECTION 23.  DISPUTE RESOLUTION

          23.1  Dispute Resolution. In the event any controversy, claim,
                ------------------
dispute, difference or misunderstanding between Owner and Vendor arises out of
or relates to this Contract, any term or condition hereof, any of the Work to be
performed hereunder or in connection herewith, each party shall designate
managers to meet and negotiate in good faith in an attempt to amicably resolve
such controversy, claim, dispute, difference or misunderstanding in writing.
Such managers shall meet for this purpose within ten (10) Business Days, or such
other time period mutually agreed to by the parties, after written notice from
either party. If the parties are unable to resolve the controversy, claim,
dispute, difference or misunderstanding through good faith negotiations within
ten (10) Business Days after such meeting or meetings, each party shall, within
five (5) Business Days after the expiration of such ten (10) Business Day
period, prepare a written position statement which summarizes the unresolved
issues and such party's proposed resolution. Such position statement shall be
delivered by Vendor to Owner's Chief Executive Officer and by Owner to Vendor's
corresponding officer or representative for resolution within (5) Business Days,
or such other time period mutually agreed to by the parties.

                                       56
<PAGE>

          23.2  Tolling. All applicable statutes of limitation shall be tolled
                -------
to the extent permitted by Applicable Law while the dispute resolution
procedures specified in this Section are pending, and nothing herein shall be
deemed to bar any party from taking such action as the party may reasonably deem
to be required to effectuate such tolling.

          SECTION 24.  TERMINATION AND EVENTS OF DEFAULT

          24.1  Termination Without Cause. Owner may, at its sole option,
                -------------------------
terminate this Contract, in its entirety, for convenience upon ninety (90) days'
prior written notice at any time. Any Purchase Orders issued prior to any such
termination above shall remain in effect and shall be fulfilled to the extent
that such orders are outstanding as of the date of such termination.

          24.2  Termination for Cause. Owner shall have the right to terminate
this Contract in its entirety (except as otherwise set forth in clause (g)
below) without any penalty or payment obligation, except as provided in
subsection 24.5 below, upon the occurrence of any of the events of default (each
a "Vendor Event of Default") as set forth below:
   -----------------------

          (a)  Vendor (i) files a voluntary petition in bankruptcy or has an
     involuntary petition in bankruptcy filed against it that is not dismissed
     within sixty (60) days of such involuntary filing, (ii) admits the material
     allegations of any petition in bankruptcy filed against it, (iii) is
     adjudged bankrupt, (iv) is unable generally to pay its debts as they
     mature, (v) makes a general assignment for the benefit of its creditors, or
     if a receiver is appointed for all or a substantial portion of its assets
     and is not discharged within sixty (60) days after his appointment, or (vi)
     Vendor commences any proceeding for relief from its creditors in any court
     under any state insolvency statutes; or

          (b)  Vendor disregards or violates any Applicable Laws or Applicable
     Permits which has a material adverse effect on the business, financial
     condition or operations of Owner or on any of its Systems ("Material
                                                                 --------
     Adverse Effect"); or
     --------------

          (c)  Vendor allows material Defects and Deficiencies to exist; or

          (d)  Vendor fails to fulfill its obligations with respect to the
     satisfaction, discharge or bonding of liens as set forth herein; or

          (e)  Vendor abandons or ceases for a period in excess of thirty (30)
     days its performance of the Work (except as a result of Force Majeure or a
     casualty which is fully covered by insurance or as to which other
     provisions reasonably acceptable to Owner are being diligently pursued); or

                                       57
<PAGE>

          (f)  Vendor assigns or subcontracts Work other than as provided for in
     this Contract which has a Material Adverse Effect; or

          (g)  Vendor misses the Guaranteed Substantial Completion Date for any
     given System by a period [*]; provided that in such case Owner shall have
                                   -------- ----
     the right, but not the obligation, to terminate this Contract with respect
     to only that System in which such delay occurred; and provided further that
     such failure to achieve such date was not caused by (i) a Force Majeure
     event and/or (ii) any act or omission of Owner; or

          (h)  if an event of Force Majeure prevents Vendor from performing its
     obligations under this Contract for a period [*], Owner may, upon prior
     written notice to Vendor, terminate this Contract in accordance with the
     Force Majeure provisions above; or

          (i)  Vendor otherwise materially breaches any provision of this
     Contract.

          24.3  Remedies. (a) If any of Vendor Events of Default exists, Owner
                --------
may, in addition to and without prejudice to any other rights or remedies of
Owner in this Contract or at law or in equity, terminate this Contract upon
written notice to Vendor; provided, however, that Owner shall have first
                          --------  -------
provided to Vendor the following periods of notice and opportunity to cure:

                (i)  in the case of a Vendor Event of Default specified in the
     foregoing clauses (a) or (b), no notice or opportunity to cure shall be
     required from Owner; and

               (ii)  in the case of any other Vendor Event of Default, Owner
     shall have provided thirty (30) days' prior written notice, and Vendor
     shall have failed (i) to commence to cure the default within five (5)
     Business Days of delivery of such notice, and (ii) to diligently pursue
     such cure and remedy the breach entirely.

          (b)  If Owner elects to terminate this Contract, Owner may, in
addition to and without prejudice to any other rights or remedies of Owner in
this Contract or of law or in equity, do one or more of the following:

               (i)  require Vendor, at no additional charge to Owner, to
     complete or assist others with the completion of all ordered but unfinished
     Work, including the sharing with Owner and others all relevant engineering
     and design data, procurement data, manufacturing data, construction and
     erection data, start-up and testing data, materials, and Products that
     shall become part of such unfinished System and/or the specified Systems,
     which Vendor would otherwise have been required to deliver to Owner
     pursuant to the terms of this Contract but for the breach, under reasonably
     appropriate non-disclosure agreements; or

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filied separately with the Securities and Exchange Commission.

                                       58
<PAGE>

               (ii)  direct that Vendor assign its Subcontractor agreements to
     Owner without any change of price or conditions therein or penalty or
     payment therefor.

          (c)  In the event of any termination of this Contract by Owner in
connection with a Vendor Event of Default, Owner shall have no liability to
Vendor for any future purchases or commitments.

          24.4  Discontinuance of Work. Upon such notification of termination,
                ----------------------
Vendor shall immediately discontinue all of the Work (unless such notice of
termination directs otherwise), and, as more fully set forth in subsection
24.3(b), deliver to Owner copies of all data, drawings, specifications, reports,
estimates, summaries, and such other information, and materials as may have been
accumulated by Vendor in performing the Work, whether completed or in process,
which Vendor would otherwise have been required to deliver to Owner pursuant to
this Contract but for the breach. Furthermore, Vendor shall assign, assemble and
deliver to Owner all purchase orders and Subcontractor agreements requested by
Owner.

          24.5  Payments. If Owner terminates this Contract pursuant to
                --------
subsection 24.2, Vendor shall not be entitled to receive further payment other
than payments due and payable and for Work performed as of the date of
termination under this Contract and not subject to dispute prior to such
termination (provided that any such disputed amounts shall be paid by Owner when
             -------- ----
and if such dispute is in fact resolved). Notwithstanding anything herein to the
contrary, Owner may withhold payments, if any, to Vendor for the purposes of
offset of amounts owed to Owner pursuant to the terms of this Contract until
such time as the exact amount of damages due Owner from Vendor is fully
determined by a court of competent jurisdiction.

          24.6  Continuing Obligations. Termination of this Contract for any
                ----------------------
reason (i) shall not relieve either party of its obligations with respect to the
confidentiality of the Proprietary Information as set forth in subsection 26.18,
(ii) shall not relieve either party of any obligation which applies to it and
which expressly or by implication survives termination, and (iii) except as
otherwise provided in any provision of this Contract expressly limiting the
liability of either party, shall not relieve either party of any obligations or
liabilities for loss or damage to the other party arising out of or caused by
acts or omissions of such party prior to the effectiveness of such termination
or arising out of its obligations as to portions of the Work already performed
or of obligations assumed by Vendor prior to the date of such termination.

          24.7  Vendor's Right to Terminate. In addition to and without
                ---------------------------
prejudice to any other rights or remedies of the Vendor in this Contract or at
law or in equity, Vendor shall have the option to terminate this Contract
without any penalty or payment obligations, other than undisputed payment
obligations outstanding as of the date of any such termination pursuant to the
terms of this Contract if:

                                       59
<PAGE>

          (a)  Owner (i) files a voluntary petition in bankruptcy or has an
     involuntary petition in bankruptcy filed against it that is not dismissed
     within sixty (60) days of such involuntary filing, (ii) admits the material
     allegations of any petition in bankruptcy filed against it, (iii) is
     adjudged bankrupt, (iv) makes a general assignment for the benefit of its
     creditors, or if a receiver is appointed for all or a substantial portion
     of its assets and is not discharged within sixty (60) days after his
     appointment, or (v) commences any proceeding for relief from its creditors
     in any court under any state insolvency statutes, and any such filing,
     proceeding, adjudication or assignment as described herein above shall
     otherwise materially impair Owner's ability to perform its obligations
     under this Contract; or

          (b)  Owner fails to make payments of undisputed amounts due to Vendor
     pursuant to the terms of this Contract which are more than sixty (60) days
     overdue, provided that such failure has continued for at least thirty (30)
     days after Vendor has notified Owner of its right and intent to so
     terminate on account of such overdue amount; and provided, further, that
     such failure to make undisputed payments to Vendor shall not arise out of
     or relate to a termination of or credit restrictions under Vendor
     Financing, or

          (c)  Owner materially breaches any provision of this Contract other
     than a breach to which Section 24.7(b) is applicable, and after Vendor
     having provided thirty (30) days' prior written notice, Owner shall have
     failed (i) to commence to cure the default within five (5) Business Days of
     delivery of such notice, and (ii) to diligently pursue such cure and remedy
     the breach entirely.

          24.8  Special Termination Events. (a) Neither Vendor nor Owner shall
                --------------------------
be obligated to perform under this Contract, except as specifically provided, in
the event that financing for the purpose of acquiring any System sufficient to
cover Owner's current payment obligations hereunder has not been finalized with
Vendor on terms and conditions reasonably satisfactory to Owner. Unless
acceptable financing is available, either party may terminate this Contract
without recourse, except as noted below, by notifying the other party in
writing. Further, the parties agree that the delivery and performance schedules
shall be extended by the period of time required to secure acceptable financing.
In the event of a termination of this Contract pursuant to this subsection Owner
shall remain liable for amounts due to Vendor for all Work performed or Products
delivered by Vendor or any of its Subcontractors pursuant to the specific terms
of this Contract which had been directly delivered to or performed for Owner
and/or any of its facilities or Sites in accordance with the terms of this
Contract. Any amounts owed by Owner for Work done or Products delivered by
Vendor during such interim period not otherwise invoiced to Owner by Vendor
prior to the termination of such interim period, shall be invoiced to Owner by
Vendor within thirty (30) days. In no event shall Owner be liable to Vendor due
to a termination of this Contract pursuant to this subsection for any of
Vendor's direct or indirect costs or expenses incurred in connection with any
supplies or equipment ordered by Vendor or agreements entered into by Vendor in
order to enable it to fulfill its obligations hereunder or in connection with
the establishment of and/or upgrade to its manufacturing, personnel,
engineering, administrative or other capacities and/or resources in
contemplation of or

                                       60
<PAGE>

pursuant to its performance in accordance with the terms of this Contract and
any amounts due to Vendor pursuant to this subsection shall be limited in all
cases to Work actually done or Products or Services actually delivered to Owner,
its Sites or its facilities.

          (b)  If at any time after the Effective Date any material change shall
have occurred in any Applicable Law or in the interpretation thereof by any
Governmental Entity, or there shall be rendered any decision in any judicial or
administrative case or proceeding, in either case which, in the reasonable
opinion of Owner would make Owner's use of any part of any System illegal or
would subject Owner or any of its Affiliates to any material penalty, other
material liability or onerous condition or to any burdensome regulation by any
Governmental Entity or otherwise render the use of such System economically
nonviable, then, with respect to such System, or affected part thereof, or with
respect to all Systems if so affected, Owner may terminate this Contract without
charge or penalty of any kind; provided that (i) Owner gives Vendor prior
                               -------- ----
written notice of any such change or decision and (ii) that Owner uses its
reasonable efforts for a reasonable time to reverse or ameliorate such change or
decision to the extent possible or practical prior to declaring such
termination.  In the event of a termination pursuant to this subsection, payment
obligations incurred by Owner for Work actually done or Products or Services
actually delivered by Vendor prior to such termination pursuant to this Contract
shall be payable by Owner to Vendor on the same terms and subject to the
limitations set forth in subsection 24.8(a) above.

          SECTION 25.  SUSPENSION

          25.1  Owner's Right to Suspend Work. Owner may at any time issue a
                -----------------------------
Change Order to Vendor to suspend all or any part of the Work for such period of
time as Owner may reasonably determine to be appropriate. Any such Change Order
shall be handled in accordance with the provisions of Section 11 hereof.

          SECTION 26.  MISCELLANEOUS

          26.1  Amendments. The terms and conditions of this Contract may only
                ----------
be amended by mutually agreed contract amendments. Each amendment shall be in
writing and shall identify the provisions to be changed and the changes to be
made. Contract amendments shall be signed by duly authorized representatives of
each of Vendor and Owner.

          26.2  Owner Liabilities. Vendor understands and agrees that no third
                -----------------
party shall guarantee or otherwise be in any way liable with respect to any
obligations or liabilities of Owner or any of its affiliates pursuant to this
Contract.

          26.3  Offset. Vendor hereby waives any right of offset of amounts owed
by Owner to Vendor pursuant to the terms of this Contract.

                                       61
<PAGE>

     26.4  Assignment.  Owner may assign this Contract, or any part hereof, to
           ----------
any Affiliate of Owner without Vendor's approval or consent. Subject to the
foregoing and except as otherwise permitted herein, neither this Contract nor
any portion hereof may be assigned by either party without the express prior
written consent of the other party. Owner may, without the consent of Vendor,
collaterally assign its rights hereunder (including, but not limited to, all
licenses with respect to the Software) to any or all parties providing financing
for any part of a System for the benefit of Vendor and one or more other
entities providing financing for any part of a System or similar arrangement for
the benefit of Vendor and one or more other entities providing for the financing
for any part of a System, in either case, which arrangement, as the case may be,
is reasonably acceptable to Vendor in accordance with the terms of the financing
documents. If requested by Owner, Vendor shall within seven (7) calendar days of
such request provide a written consent to any such assignment; provided that
                                                               -------- ----
such consent shall permit reassignment if the financing parties exercise their
remedies under the documents for such financing subject to reasonable standards
as to (i) the creditworthiness of the assignee and (ii) the fact that the
assignee is not at such time a direct competitor of Vendor involved in the
manufacture of communications equipment, software or related services. The
foregoing rights and obligations are in addition to those set forth elsewhere in
this Contract. Any attempted assignment in violation of the terms of this
Contract shall be null and void. Subject to the foregoing, this Contract shall
bind and inure to the benefit of the parties to this Contract, their successors
and permitted assigns.

     26.5  Notices.  Except as otherwise expressly stated herein, all notices,
           -------
requests, demands and other communications which are required or may be given
under this Contract shall be in writing and shall be deemed to have been duly
given when received if personally delivered; when transmitted if transmitted by
telecopy, electronic or digital transmission method; the day after it is sent,
if sent for next day delivery to a domestic address by recognized overnight
delivery service; and three (3) days after sending, if sent by certified or
registered mail, postage prepaid, return receipt requested. All notices shall be
addressed as follows:

     If to Owner:

            Cricket Communications, Inc.
            10307 Pacific Center Court
            San Diego, California 92121
            Attention: Chief Executive Officer

            With a copy to:
            Sr. Vice President, General Counsel
            10307 Pacific Center Court
            San Diego, California 92121

            Telephone: (858) 882-6000
            Facsimile: (858) 882-6080

                                       62
<PAGE>

     If to Vendor:

            Nortel Networks Inc.
            2221 Lakeside Boulevard
            Richardson, Texas 75082-4399
            Attention:
            Telephone:
            Facsimile:

By written notice provided pursuant to this subsection, either party may change
its designated addressee for purposes of giving notices under this Contract.

     26.6  Governing Law.  This Contract is governed by the laws of the State of
           -------------
California, without regard to principles of conflict of laws. This Contract
shall be deemed to be made and executed in the State of California.

     26.7  Remedies.  Subject only to the limitations on liability contained in
           --------
Section 20, each party shall be entitled to pursue any and all rights and
remedies that are available at law or in equity.

     26.8  Consent to Jurisdiction.  Each party to this Contract, by its
           -----------------------
execution hereof, (i) hereby irrevocably submits to the exclusive jurisdiction
of the United States District Court located in the Southern District of
California or the state courts of the State of California located in San Diego,
California for the purpose of any action, claim, cause of action or suit (in
contract, tort or otherwise), inquiry, proceeding or investigation arising out
of or based upon this Contract or relating to the subject matter hereof, (ii)
hereby waives, to the extent not prohibited by applicable law, and agrees not to
assert, by way of motion, as a defense or otherwise, in any such action, any
claim that it is not subject personally to the jurisdiction of the above-named
courts, that its property is exempt or immune from attachment or execution,
that-any such proceeding brought in one of the above-named courts is improper,
or that this Contract or the subject matter hereof may not be enforced in or by
such court, and (iii) hereby agrees not to commence any action, claim, cause of
action or suit (in contract, tort or otherwise), inquiry, proceeding or
investigation arising out of or based upon this Contract or relating to the
subject matter hereof other than before one of the above-named courts nor to
make any motion or take any other action seeking or intending to cause the
transfer or removal of any such action, claim, cause of action or suit (in
contract, tort or otherwise), inquiry, proceeding or investigation to any court
other than one of the above-named courts whether on the grounds of inconvenient
forum or otherwise. Each party hereby consents to service of process in any such
proceeding in any manner permitted by California law, and agrees that service of
process by registered or certified mail, return receipt requested, at its
address specified herein.

     26.9  Compliance with Law.  Owner and Vendor shall (a) comply with all
           -------------------
Applicable Laws in the performance of this Contract, including, without
limitation, the laws

                                       63
<PAGE>

and regulations of the United States Department of Commerce, State Department
and the Federal Communications Commission and any other applicable agency or
department.

     26.10  Headings.  The headings given to the Sections and subsections herein
            --------
are inserted only for convenience and are in no way to be construed as part of
this Contract or as a limitation of the scope of the particular Section or
subsection to which the title refers.

     26.11  Severability.  Whenever possible, each provision of this Contract
            ------------
shall be interpreted in such a manner as to be effective and valid under such
applicable law, but, if any provision of this Contract shall be held to be
prohibited or invalid in any jurisdiction, the remaining provisions of this
Contract shall remain in full force and effect and such prohibited or invalid
provision shall remain in effect in any jurisdiction in which it is not
prohibited or invalid.

     26.12  Waiver.  Unless otherwise specifically provided by the terms of this
            ------
Contract, no delay or failure to exercise a right resulting from any breach of
this Contract shall impair such right or shall be construed to be a waiver
thereof, but such right may be exercised from time to time as may be deemed
expedient. If any representation, warranty or covenant contained in this
Contract is breached by either party and thereafter waived by the other party,
such waiver shall be limited to the particular breach so waived and not be
deemed to waive any other breach under this Contract.

     26.13  Public Statements and Advertising.  (a)  Neither party shall issue
            ---------------------------------
any public statement (or any private statement unless required in the
performance of the Work) relating to or in any way disclosing any aspect of the
Work or any System including the scope, the specific terms of this Contract,
extent or value of the Work or any System. Express written consent of the other
party is required prior to the invitation of or permission to any reporter or
journalist to enter upon the System or any part thereof. Vendor agrees not to
use for publicity purposes any photographs, drawings and/or materials describing
any System without obtaining the prior written consent of Owner, which consent
shall not be unreasonably withheld. Owner agrees not to use for publicity
purposes any photographs, drawings and/or materials describing Vendor's products
and services without obtaining the prior written consent of Vendor, which
consent shall not be unreasonably withheld. This subsection shall not prohibit
the provision of necessary information to prospective Subcontractors and
Vendor's or Owner's personnel, agents or consultants or other disclosures which
are required by Applicable Law, including without limitation federal and state
securities laws and regulations; provided that, in such event each party shall
notify the other party of any such impending disclosure and allow the other
party to request redactions prior to such disclosure. All other such public
disclosures by a party require the written consent of the other party.

     (b) Each party shall submit to the other proposed copies of all advertising
(other than public statements or press releases) wherein the name, trademark or
service mark of the other party or its affiliates is mentioned; and neither
party shall publish or use such advertising without the other party's prior
written approval. Such approval shall be granted as promptly as possible and
shall not be unreasonably withheld. The parties acknowledge

                                       64
<PAGE>

that the obtaining of prior written approval for each such use pursuant to this
subsection may be an administrative burden. At the request of either party,
Owner and Vendor shall establish mutually acceptable guidelines for the uses
specified therein. Such guidelines shall be subject to change from time to time
at the reasonable request of either party.

     26.14  Records and Communications.  Procedures for keeping and distributing
            --------------------------
orderly and complete records of the Work and its progress are stated in the
Exhibits. The procedures so established shall be followed throughout the course
of the Work unless Owner and Vendor mutually agree in advance in writing to
revise the procedures. Procedures for communications among Owner and Vendor are
stated in the Exhibits. The procedures so established shall be followed
throughout the course of the Work unless Owner and Vendor mutually agree in
advance and in writing to revise such procedure.

     26.15  Ownership of Specifications.  The Specifications shall constitute
            ---------------------------
the Proprietary Information of each party to the extent of each party's
contribution to the Specifications. Neither party shall use those parts of the
Specifications contributed by the other party or any part of the Proprietary
Information of the other party for any purpose other than fulfilling or
exercising their respective rights or obligations under this Contract.

     26.16  Financing Requirements.  Vendor acknowledges that the attainment of
            ----------------------
financing for construction of the System may be subject to conditions that are
customary and appropriate for the providers of such financing. Therefore, Vendor
agrees to promptly consider any reasonable amendment to or modification or
assignment of this Contract required by such providers (including, without
limitation, any pertinent industrial development authority or other similar
governmental agency issuing bonds for financing of the System) which do not
materially modify the scope of Vendor's Work in order to obtain such financing.
In the event that any such amendment or modification materially increases
Vendor's risk or costs hereunder, Owner and Vendor shall negotiate in good faith
to adjust pricing matters, and to equitably adjust such other provisions of this
Contract, if any, which may be affected thereby, to the extent necessary to
reflect such increased risk or costs. In no event shall Vendor be required to
accept any modification or amendment pursuant to this subsection provided it has
a commercially reasonable basis for such refusal.

     26.17  Owner Review, Comment and Approval.  To the extent that various
            ----------------------------------
provisions of this Contract provide for Owner's review, comment, inspection,
evaluation, recommendation or approval, Owner may at its option do so in
conjunction and/or consultation with Vendor. To the extent that this Contract
requires Owner to submit, furnish, provide or deliver to Vendor any report,
notice, Change Order, request or other items, Owner may at its option and upon
written notice to Vendor designate a representative to submit, furnish, provide
or deliver such items as Owner's agent therefor. To the extent that various
provisions of this Contract provide that Owner may order, direct or make
requests with respect to performance of the Work or is provided access to the
System sites or any other site, Owner may at its option and upon written notice
to Vendor authorize a representative to act as Owner's agent therefor. Upon
receipt of such notice, Vendor shall be

                                       65
<PAGE>

entitled to rely upon such authorization until a superseding written notice from
Owner is received by Vendor.

     26.18  Confidentiality.  (a)  All information which is identified as
            ---------------
proprietary or confidential by the disclosing party, including without
limitation all oral and written information (including, but not limited to,
determinations or reports by arbitrators pursuant to the terms of this
Contract), disclosed to the other party is deemed to be confidential, restricted
and proprietary to the disclosing party (hereinafter referred to as "Proprietary
                                                                     -----------
Information"). Each party agrees to use the Proprietary Information received
-----------
from the other party only for the purpose of this Contract. Except as specified
in this Contract, no other rights, and particularly licenses, to trademarks,
inventions, copyrights, patents, or any other intellectual property rights are
implied or granted under this Contract or by the conveying of Proprietary
Information between the parties. Proprietary Information supplied is not to be
reproduced in any form except as required to accomplish the intent of, and in
accordance with the terms of, this Contract. The receiving party shall provide
the same care to avoid disclosure or unauthorized use of Proprietary Information
as it provides to protect its own similar proprietary information but in no
event shall the receiving party fail to use reasonable care under the
circumstances to avoid disclosure or unauthorized use of Proprietary
Information. All Proprietary Information shall be retained by the receiving
party in a secure place with access limited to only such of the receiving
party's employees, subcontractors or agents who need to know such information
for purposes of this Contract and to such third parties as the disclosing party
has consented to by prior written approval. All Proprietary Information, unless
otherwise specified in writing (i) remains the property of the disclosing party,
(ii) shall be used by the receiving party only for the purpose for which it was
intended, and (iii) such Proprietary Information, including all copies of such
information, shall be returned to the disclosing party or destroyed after the
receiving party's need for it has expired or upon request of the disclosing
party, and, in any event, upon termination of this Contract. At the request of
the disclosing party, the receiving party shall furnish a certificate of an
officer of the receiving party certifying that Proprietary Information not
returned to disclosing party has been destroyed. For the purposes hereof,
Proprietary Information does not include information which:

            (i)   is published or is otherwise in the public domain through no
            fault of the receiving party at the time of any claimed disclosure
            or unauthorized use by the receiving party;

            (ii)  prior to disclosure pursuant to this Contract is properly
            within the legitimate possession of the receiving party as evidenced
            by reasonable documentation to the extent applicable;

            (iii) subsequent to disclosure pursuant to this Contract is
            lawfully received from a third party having rights in the
            information without restriction of the third party's right to
            disseminate the information and without notice of any restriction
            against its further disclosure;

                                       66
<PAGE>

            (iv)  is independently developed by the receiving party or is
            otherwise received through parties who have not had, either
            directly or indirectly, access to or knowledge of such Proprietary
            Information;

            (v)   is transmitted to the receiving party after the disclosing
            party has received written notice from the receiving party after
            termination or expiration of this Contract that it does not desire
            to receive further Proprietary Information;

            (vi)  is obligated to be produced under order of a court of
            competent jurisdiction or other similar requirement of a
            Governmental Entity, so long as the party required to disclose the
            information provides the other party with prior notice of such order
            or requirement and its cooperation to the extent reasonable in
            preserving its confidentiality; or

            (vii) the disclosing party agrees in writing is free of such
            restrictions.

            (b)  Because damages may be difficult to ascertain, the parties
agree, without limiting any other rights and remedies specified herein, an
injunction may be sought against the party who has breached or threatened to
breach this subsection. Each party represents and warrants that it has the right
to disclose all Proprietary Information which it has disclosed to the other
party pursuant to this Contract, and each party agrees to indemnify and hold
harmless the other from all claims by a third party related to the wrongful
disclosure of such third party's proprietary information.

            26.19  Entirety of Contract; No Oral Change.  This Contract and the
                   ------------------------------------
Exhibits and Schedules referenced herein constitute the entire contract between
the parties with respect to the subject matter hereof, and supersede all
proposals, oral or written, all previous negotiations, and all other
communications between the parties with respect to the subject matter hereof. No
modifications, alterations or waivers of any provisions herein contained shall
be binding on the parties hereto unless evidenced in writing signed by duly
authorized representatives of both parties as set forth in this Contract.

            26.20  Relationship of the Parties.  Nothing in this Contract shall
                   ---------------------------
be deemed to constitute either party a partner, agent or legal representative of
the other party, or to create any fiduciary relationship between the parties.
Vendor is and shall remain an independent contractor in the performance of this
Contract, maintaining complete control of its personnel, workers, Subcontractors
and operations required for performance of the Work. This Contract shall not be
construed to create any relationship, contractual or otherwise, between Owner
and any Subcontractor, except to establish Owner as a third party beneficiary of
Vendor's contacts with Subcontractors as provided herein.

            26.21  Discretion.  Notwithstanding anything contained herein to
                   ----------
the contrary, to the extent that various provisions of this Contract call for an
exercise of discretion in making decisions or granting approvals or consents,
the parties shall be required to exercise such discretion, decision or approvals
and in good faith.

                                       67
<PAGE>

            26.22  Non-Recourse.  No past, present or future limited or general
                   ------------
partner in or of Owner, no parent or other affiliate of any company comprising
Owner, and no officer, employee, servant, executive, director, agent or
authorized representative of any of them (each, an "Operative") shall be liable
                                                    ---------
by virtue of the direct or indirect ownership interest of such Operative in
Owner for payments due under this Contract or for the performance of any
obligation, or breach of any representation or warranty made by Owner hereunder.
The sole recourse of Vendor for satisfaction of the obligations of Owner under
this Contract shall be against Owner and Owner's assets and not against any
Operative or any assets or property of any such Operative. In the event that a
default occurs in connection with such obligations, no action shall be brought
against any such Operative by virtue of its direct or indirect ownership
interest in Owner.

            26.23  Improvements, Inventions and Innovations.  All rights in any
                   ----------------------------------------
improvements, inventions, and innovations made solely by Owner shall vest in
Owner, and Owner and its affiliates shall have the right to exploit such
improvements, inventions, and innovations. All rights in any improvements,
inventions and innovations made solely by Vendor shall vest in Vendor, and
Vendor and its affiliates shall have the right to exploit such improvements,
inventions and innovations. All rights in any improvements, inventions and
innovations made by the substantial contribution of both parties ("Joint
                                                                   -----
Information") shall vest jointly in both parties. Joint Information does not
-----------
include any underlying information owned by one of the parties prior to
commencement of such joint activities or developed beyond the scope of such
joint activities, including Products and Product information, technical
information or inventions developed prior to the commencement of any joint
activities, developed outside of the scope of such joint activities or developed
solely by either party. The rights of joint ownership to such Joint Information
shall be rights of full non-exclusive worldwide ownership, including rights to
license and transfer. Each party may exploit its rights to the Joint Information
independent of the other and may retain all economic benefits thereof, neither
party shall have any obligation to account to the other for profits derived from
the Joint Information and each party shall have full rights to enforce the Joint
Information intellectual property rights against non-authorized users.

            26.24  Attachments and Incorporations.  All Schedules and Exhibits
                   ------------------------------
attached hereto, are hereby incorporated by reference herein and made a part of
this Contract with the same force and effect as though set forth in their
entirety herein.

            26.25  Conflicts.  In the event of any conflict or inconsistency
                   ---------
among the provisions of this Contract and the documents attached hereto and
incorporated herein, such conflict or inconsistency shall be resolved by giving
precedence to this Contract and thereafter to the Exhibits, Schedules and
Specifications.

            26.26  References to Certain Sources.  Reference to standard
                   -----------------------------
specifications, manuals or codes of any technical society, organization or
association or to the laws or regulations of any Governmental Entity, whether
such reference is specific or by implication, by this Contract, means the latest
standard specification, manual, code, laws or regulations in effect at the time
of such reference, except as may be otherwise specifically

                                       68
<PAGE>

agreed to by Owner. However, no provision of any reference, standard,
specification, manual or code (whether or not specifically incorporated by
reference in this Contract) shall be effective to change the duties and
responsibilities of Owner or Vendor from those set forth in this Contract;
provided that nothing contained in this Contract shall require Owner or Vendor
-------- ----
to violate then existing and enforceable Applicable Laws.

            26.27  Counterparts.  This Contract may be executed by one or more
                   ------------
of the parties to this Contract on any number of separate counterparts, and all
of said counterparts taken together shall be deemed to constitute one and the
same instrument.

            26.28  Cooperation.  Vendor acknowledges that Owner may have one
                   -----------
or more third party vendors, contractors and other personnel engaged to provide
work, equipment or services to Owner in connection with or related to this
Contract. Vendor agrees to reasonably communicate and cooperate with such third
parties at all times and, at the request of Owner, coordinate Vendor's and
Vendor's Subcontractors' activities hereunder with the activities of such third
parties.

            26.29  Survival.  Notwithstanding any expiration or termination of
                   --------
this Contract, the provisions of Sections 2.8, 12, 13, 14, 15, 18, 20 and 26.18
shall continue in full force and effect.

            OWNER AND VENDOR HAVE READ THIS CONTRACT INCLUDING ALL SCHEDULES AND
EXHIBITS HERETO AND AGREE TO BE BOUND BY ALL THE TERMS AND CONDITIONS HEREOF AND
THEREOF.

            IN WITNESS WHEREOF, the parties have executed this Contract as of
the date first above written.

VENDOR:                                     OWNER:

NORTEL NETWORKS INC.,                       CRICKET COMMUNICATIONS, INC.,
a Delaware corporation                      a Delaware corporation

By: _____________________________           By: _____________________________
    Name:                                       Name:
    Title:                                      Title:

                                       69
<PAGE>

                                  EXHIBIT A-1
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                               PRICING DISCOUNTS

  [One Page of Pricing Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT A-2
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                          PITTSBURGH PRICING [*] BTS

[Five Pages of Pricing Lists Deleted Pursuant to Confidential Treatment Request]

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment.  The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                  EXHIBIT A-3
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                               SERVICES PRICING

[Two Pages of Pricing Lists Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                  EXHIBIT A-4
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                            COMPONENT LEVEL PRICES

[Two Pages of Pricing Lists Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                  EXHIBIT A-5
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                               SOFTWARE PRICING

 [One Page of Pricing Lists Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                  EXHIBIT A-6
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                                OTHER PRODUCTS

[Two Pages of Pricing Lists Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                  EXHIBIT A-7
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                      NETWORK MODELS 1 to 18 ASSUMPTIONS

 [Twenty-Nine Pages of Pricing Lists Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT A-8
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                              DISCOUNT STRUCTURE

 [Thirty-One Pages of Pricing Lists Deleted Pursuant to Confidential Treatment
                                   Request]
<PAGE>

                                  EXHIBIT A-9
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                          METROCELL INDOOR BTS MODELS

                     Omni-Sector Single Carrier Metro Cell

[Nine Pages of Pricing Lists Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                  EXHIBIT A-9
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT
                         METROCELL OUTDOOR BTS MODELS

                     Omni-Sector Single Carrier Metro Cell

[Nine Pages of Pricing Lists Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                 EXHIBIT A-10
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                     METROCELL INDOOR BTS MODELS WITH MFRM

   [Twenty Pages of Pricing Lists Deleted Pursuant to Confidential Treatment
                                   Request]
<PAGE>

                                 EXHIBIT A-11
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                                  SPARES LIST

[Three Pages of Product Information Deleted Pursuant to Confidential Treatment
                                   Request]
<PAGE>

                                  EXHIBIT A-12
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                                TRAINING CREDITS

Vendor shall provide Owner [***] non-transferable training credits (each, a
"Credit"), valued at one class day per Credit for every new System ordered by
Owner from Vendor during the Contract Term; provided, however, the total amount
of Credits provided to Owner by Vendor pursuant to the Exhibit F1 shall not
exceed [***] Credits.  Owner shall bear the cost of transportation, meals,
lodging or any other incidental expenses of Owner (or Affiliate or Related
Operator) personnel to, from and during training.  Credits must be used prior to
expiration or termination of the Contract, after which such Credits will be
forfeited by Owner and shall have no cash value.  Credits may only be used to
train people employed by Owner, an Affiliate, or a Related Operator and not
independent contractors, consultants, or the like.  The availability of any
training shall be subject to any prerequisites identified by Vendor in ADVISOR
or other documentation with respect to such training.

        Owner may apply such Credits toward any charges invoiced by Vendor for:

     1) Vendor led training courses set forth in Vendor' Technical Training
        Catalog entitled "ADVISOR", or

     2) any charges invoiced by Vendor in conjunction with ECIC program
        activity.

Any training charges to which Owner does not apply such Credits shall be payable
by Owner to Vendor at Vendor' then-current prices and Owner shall render payment
in accordance with Section 5.3 of the Contract.  Such prices shall be subject to
change by Vendor upon notice to Owner.  Vendor may change, modify, update and/or
add training programs as new Product features/releases are made available.

Owner agrees that the courseware and instructional material are confidential
information provided by Vendor, and shall hold the courseware and instructional
material in confidence in accordance with Section 26.18, Confidentiality, of
this Contract.

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                  EXHIBIT A-13
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                              RECOMMENDED TRAINING

The following list of training courses are recommended for Owner's technicians.
Information concerning the courses listed below can be found at the following
address: [*] (look under CDMA).

[Three Pages of Training Information Deleted Pursuant to Confidential Treatment
                                    Request]

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment.  The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                  EXHIBIT B-1
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                  CANCELLATION CHARGES FOR BTSs AND EXPANSIONS

  [One Page of Pricing Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT B-2
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

           CANCELLATION CHARGES FOR SWITCH/BSC (EXCLUDING EXPANSIONS)

  [One Page of Pricing Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT C
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                                   INSURANCE

          Each party shall, during the term of this Contract, at its own cost
and expense, carry and maintain at a minimum, the insurance coverage listed
below. If either party is not self-insured, that party shall maintain such
coverages with insurers that are licensed in the state of operation. Vendor
shall not commence any work hereunder until each party has fulfilled all
insurance requirements herein. Each party shall require its subcontractors and
agents to maintain the same insurance coverage listed below.

   . Workers' Compensation insurance with statutory limits as required in the
     state(s) of operation; and providing coverage for either party's employee
     entering onto Owner premises, even if not required by statute. Employers'
     Liability or "Stop Gap" insurance with limits of not less than $500,000 for
     each occurrence.

   . Commercial General Liability Insurance covering claims for bodily injury,
     death, personal injury or property damage occurring or arising out of the
     performance of this Agreement, including coverage for independent
     contractor's protection (required if any work will be subcontracted),
     premises-operations, products/completed operations and contractual
     liability with respect to the liability assumed by either party hereunder.

     The limits of insurance shall be:
<TABLE>
<CAPTION>
 <S>                                                              <C>
          Each Occurrence (Bodily Injury/Property Damage)        $1,000,000.00
          General Aggregate Limit (Annual Aggregate)             $2,000,000.00
          Products-Completed Operations Limit (Annual Aggregate) $1,000,000.00
</TABLE>

   . Comprehensive Automobile Liability Insurance covering ownership, operation
     and maintenance of all owned, non-owned and hired motor vehicles used in
     connection with the performance of this Agreement, with limits of at least
     $1,000,000 combined single limit for bodily injury and property damage.

          The insurance limits required herein may be obtained through any
combination of self-insurance, primary and excess or umbrella liability
insurance.  Each party shall furnish the other prior to the start of the work,
if required by the other party, certificates or adequate proof of the insurance
required by this clause.  Each party shall notify the other in writing at least
thirty (30) days prior to cancellation of or any material change in the policy.
Notwithstanding the above, each party shall have the option where permitted by
law to self-insure any or all of the foregoing risks.
<PAGE>

                                   EXHIBIT D
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                             PURCHASE ORDER ADDRESS

All Purchase Orders shall be sent to the Vendor at the following address in
accordance with Section 3.1 of the Agreement:

Nortel Networks Inc.
2350 Campbell Creek Blvd.
Richardson, Texas
75082

Fax: [*]

Attn: [*]

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                   EXHIBIT E
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                              LEAD TIMES/INTERVALS

   [One Page of Schedules Deleted Pursuant to Confidential Treatment Request]
<PAGE>

                                   EXHIBIT F
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                               PROJECT MANAGEMENT
                            STATEMENT OF WORK (SOW)

In accordance with an accepted Purchase Order, Vendor shall provide project
management Services for the build-out of Owner's System as set forth herein.
Such Services may include management of all of Vendor's resources (including
subcontractors, as applicable) may as program management, RF and network
engineering, Equipment installation and commissioning, spectrum clearing, Site
acquisition, architectural and engineering, Site construction and logistics
management ("Project Management Services").

[Three Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT G
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                               SPECTRUM CLEARING
                            STATEMENT OF WORK (SOW)

In accordance with an accepted Purchase Order, Vendor shall provide the spectrum
clearing Services set forth in Section 1 below ("Spectrum Clearing Services"),
to (i) identify and, (ii) attempt to alleviate interference from users currently
occupying Owner's desired spectrum ("Incumbents"). Owner acknowledges and agrees
that Vendor's ability to fulfill certain obligations hereunder and/or obtain
satisfactory results is dependent upon the full cooperation of the Incumbent(s)
and the provision by the Incumbent of necessary information to Vendor relative
to Incumbent's use of spectrum. Owner further acknowledges and agrees that the
failure of Vendor to perform any such obligation(s) or obtain satisfactory
results that are due to the lack of cooperation by any Incumbent shall not
constitute a breach or delay under the Agreement. In the event Vendor accepts a
Purchase Order for Spectrum Clearing Services for a System, as described herein,
Vendor shall have no liability under the Agreement for any resulting schedule
delays related to such System.

[Eight Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT H
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                                SITE ACQUISITION
                            STATEMENT OF WORK (SOW)

As set forth in an accepted Purchase Order and on a Site-by-Site basis, Vendor
shall provide Site acquisition Services listed herein ("Site Acquisition
Services"), in the following phases:

     (i)  Phase I - Zoning audit/Site identification,
     (ii)  Phase II - Lease/Site acquisition, and
     (iii) Phase III - Zoning approvals and permits.

The provision by Vendor of Site Acquisition Services as set forth herein assumes
that Vendor, pursuant to an accepted Purchase Order, has developed the RF design
and identified desirable Search Rings (as defined below) for BTS placement for
Owner's wireless network.  In the event Owner utilizes an RF design not provided
by Vendor, the identification of all Search Rings shall be the responsibility of
Owner.

[Seven Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT I-1
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                         ARCHITECTURAL AND ENGINEERING
                            STATEMENT OF WORK (SOW)
                                  FOR SWITCHES

In accordance with an accepted Purchase Order, Vendor shall provide the
following architectural and engineering Services, as set forth herein as
applicable, on a Site-by-Site basis. The provision of A&E Switch Services
performed on any Site as set forth herein assumes that Vendor is able to
reasonably obtain consent from the applicable Site owner to perform any such A&E
Switch Services. Receipt of such consent shall be a condition precedent with
regard to Vendor's performance of A&E Switch Services as set forth herein. In
the event such consent is contingent on the payment of a fee by Vendor to any
Site owner, Vendor shall first obtain Owner's agreement as to the amount of, and
consent to reimburse Vendor for, such fee.

[Five Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT I-2
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                         ARCHITECTURAL AND ENGINEERING
                            STATEMENT OF WORK (SOW)
                                 FOR BTS SITES

In accordance with an accepted Purchase Order, Vendor shall provide the
following architectural and engineering Services, as set forth herein as
applicable, on a Site-by-Site basis. The provision of A&E BTS Services performed
on any Site as set forth herein assumes that Vendor is able to reasonably obtain
consent from the applicable Site owner to perform any such A&E BTS Services.
Receipt of such consent shall be a condition precedent with regard to Vendor's
performance of A&E BTS Services as set forth herein. In the event such consent
is contingent on the payment of a fee by Vendor to any Site owner, Vendor shall
first obtain Owner's agreement as to the amount of, and consent to reimburse
Vendor for, such fee.

 [Two Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT J-1
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                            CONSTRUCTION MANAGEMENT
                            STATEMENT OF WORK (SOW)
                                  FOR SWITCHES

In accordance with a accepted Purchase Order, Vendor shall provide the
construction management Services as set forth herein with respect to any
construction Work provided hereunder by Vendor, including, Site construction
management, materials logistics management, management of Architectural and
Engineering Work, Project documentation and reporting and quality control
("Construction Management Services") as follows:

 [Two Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT J-2
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                            CONSTRUCTION MANAGEMENT
                            STATEMENT OF WORK (SOW)
                                 FOR BTS SITES

In accordance with a accepted Purchase Order, Vendor shall provide the
construction management Services as set forth herein with respect to any
construction Work provided hereunder by Vendor, including, Site construction
management, materials logistics management, management of Architectural and
Engineering Work, Project documentation and reporting and quality control
("Construction Management Services") as follows:

 [Two Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT K
                                     TO THE
                          CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

             SITE CONSTRUCTION AND ANTENNA INSTALLATION AND TESTING
                            STATEMENT OF WORK (SOW)

As set forth in an accepted Purchase Order and on a Site-by-Site basis, Vendor
shall provide construction Services as set forth herein. Vendor shall construct
the Sites in accordance with applicable industry standards, Vendor
specifications, applicable manufacturer's specifications and practices,
applicable construction drawings, as well as local, state and federal
regulations, ordinances and statutes. The provision by Vendor of construction
Services as set forth herein is conditioned upon Owner's purchase of Vendor's
construction management Services (the description and price for which are not
included in this statement of work).

 [Six Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT L
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                        INSTALLATION AND COMMISSIONING
                      STATEMENT OF WORK/PROJECT SCHEDULE

1.0  INTRODUCTION

     In accordance with an accepted Purchase Order, this Installation and
     Commissioning Statement of Work ("SOW") defines the work requirements and
     responsibilities of both Vendor and Owner, which are necessary to engineer,
     furnish, deliver, install and test all Equipment furnished hereunder in
     accordance with the Project Intervals set forth in Section E herein, and in
     the case of a BTS, necessary for shipment to Owner's designated delivery
     location (e.g., a warehouse or staging area)("Installation and
     Commissioning Services").

     Vendor's obligation to perform Installation and Commissioning Services
     assumes receipt and acceptance of a valid Purchase Order for such Services.
     The materials and labor required for installation activities as described
     below represent a "standard" installation.  Owner understands and agrees
     that certain of the requirements for such installation and commissioning
     activities are Site dependent, and Vendor reserves the right to quote
     additional charges on a time-and-material basis as the actual designated
     Switch Site(s) ("Designated Switch Site") or installation Site(s), as
     applicable, are identified.

    [Sixteen Pages of Technical Information Deleted Pursuant to Confidential
                               Treatment Request]
<PAGE>

                                 ATTACHMENT 1

                           BTS SITE READY CHECK LIST

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------
<S>                                           <C>                               <C>
  Site                                        Proj. #                           C.O.E.O.

--------------------------------            ----------------------            -------------------------------

  Nearest Cross Street                                                          Date(1)

------------------------------------------------------------------            --------------------------------

==============================================================================================================

             BTS Ready                        Type of Site(2)                   Date Observed(3)
   -------
                                            ---------------------------------

                             Indoor
                             Installation?
          -----------                                                        -------------------------------

                             Grate/Pad
          -----------                                                        -------------------------------

                             Fence
          -----------                                                        -------------------------------

                             Tower and Antenna System Complete
                             (Valid Sweep Test Results)
          -----------                                                        -------------------------------

                             RFFE Mounting positions available
                             (Icebridge/brackets etc.)
          -----------                                                        -------------------------------

                             Grounds available at BTS and RFFEs
                             (megger test results provided)
          -----------                                                        -------------------------------

                             AC Available (at demark)
          -----------                                                        -------------------------------

                             T1 Available (and tested)
          -----------                                                        -------------------------------

                             Site Access (Special Needs)
          -----------                                                        -------------------------------

Additional Info:

--------------------------------------------------------------------------------------------------------------
==============================================================================================================
</TABLE>
Notes:
1.   For the header block, please put in the date that all sub-topics were
     observed to be complete.
2.   For Grate/Pad please put type of site.
3.   For remaining blocks, please put in the date you observed each.
4.   Please include in comments any additional information that may be useful in
     completing the installation and commissioning of the BTS.

Owner:                               Vendor acknowledgment:

Date:                                Date:
<PAGE>

                                  ATTACHMENT 1

                          SWITCH SITE READY CHECK LIST

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------
<S>                                                      <C>                                       <C>
Site                                                     Proj. #                                   C.O.E.O.

--------------------------------------              ----------------------------              ----------------

Nearest Cross Street                                                                                 Date

------------------------------------------------------------------                            ----------------

==============================================================================================================

Owner has completed its obligations, as set forth in Annex 2, Schedule A, Section B, Subsection 2 necessary
for Vendor to commence installation/commissioning of Switch/BSC Equipment.

Additional Info:

--------------------------------------------------------------------------------------------------------------
</TABLE>

Owner:                                  Vendor acknowledgment:

Date:                                   Date:
<PAGE>

                                 SCHEDULE A-1

                     SYSTEM ELEMENT FIELD INSTALLATION AND
                     COMMISSIONING FOR METROCELL PRODUCTS

Introduction

This Installation and Commissioning Statement of Work ("SOW") defines the work
requirements and responsibilities of both Vendor and the Owner which are
necessary to engineer, furnish, deliver, install and test Metrocell Products
furnished hereunder in accordance with the Project Intervals set forth in
Section D herein, necessary for shipment to the Owner's designated FOB Point.
Vendor's obligation to perform the Services described hereunder assumes receipt
and acceptance of a valid Purchase Order for such Services and associated
Products. The materials and labor required for installation activities as
described below represent a "standard" installation. Owner understands and
agrees that certain of the requirements for such installation and commissioning
activities are Site dependent, and Vendor reserves the right to quote (pursuant
to and in accordance with the pricing as set forth in the Agreement or
applicable Exhibit) additional charges on a time-and-material basis as the
actual Designated Switch Site(s) or installation Site(s), as applicable, are
identified, in accordance with this Agreement. Owner's responsibilities set
forth herein are conditions precedent to Vendor's responsibilities set forth
herein.

[Eight Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  ATTACHMENT 1
                                       TO
                                  SCHEDULE B-1
                           BTS SITE READY CHECK LIST

<TABLE>
<CAPTION>
                                                                                   Date(1)

                                                                                 ------------------------------
---------------------------------------------------------------------------------------------------------------
<S>                                              <C>                               <C>
  Site                                           Proj. #                           C.O.E.O.
                                                                                   What is this # A Vendor
                                                                                   provided number required
                                                                                   for tracking the BTS.

--------------------------------------         --------------------              ------------------------------

  Nearest Cross Street                                                             Cascade #

---------------------------------------------------------                        ------------------------------

===============================================================================================================

                           BTS Ready             Type of Site(2)                   Date Observed(3)
        -------
                                               Is this the same as the checklist
                                               below.
                                             ------------------------------------------------------------------
                           Indoor Installation
        -------                                                                  ------------------------------
                           Grate/Pad
        -------                                                                  ------------------------------
                           Temp/Perm Fence
        -------                                                                  ------------------------------
                           Tower and Antenna System  Complete
        -------                                                                  ------------------------------
                           Site Access (Special Needs)
        -------                                                                  ------------------------------

Additional Info:
---------------------------------------------------------------------------------------------------------------
Access Requirements:
--------------------

---------------------------------------------------------------------------------------------------------------
===============================================================================================================
                                                                               Date Observed(3)

                                                                             ----------------------------------
[ ]        BTS Set on Pad
                                                                             ----------------------------------
[ ]        Grounds Connected to BTS
                                                                             ----------------------------------
[ ]        AC Available (at BTS breaker) and BTS connected
                                                                             ----------------------------------
[ ]        Valid MEGGER Result  - SSLP SSEO  See comments in Section A, Item 14
                                                                             ----------------------------------

                           GPS Antenna Installed
        -------                                                              ----------------------------------

Additional Info:

---------------------------------------------------------------------------------------------------------------
===============================================================================================================
     [ ]     BTS On-Air Ready                                                  Date Observed(3)

                                                                                -------------------------------
             [ ]           T1 Available and CSU in Telco Box Shows Green
                           Light
                                                                                -------------------------------
             [ ]           Jumpers from Antenna Lines ready for connection
                           to enclosure Connected
                                                                                -------------------------------
             [ ]           Valid Sweep Test Results
                           (Ask I&C Warehouse In-Charge)
                                                                                -------------------------------
Additional Info:

---------------------------------------------------------------------------------------------------------------
===============================================================================================================
</TABLE>
<PAGE>

Notes:
1. For the header Block, please put in the date that all sub-topics were
   observed to be complete.
2. For Grate/Pad please put type of site.
4. For remaining blocks, please put in the date you observed each.
5. For access requirements, please indicate lock combination number, who has the
   key(s) and how to contact that person, specific hours access is available,
   etc.

   -  Space has been provided at the end of each section to list additional info
      deemed necessary (i.e., bad road when muddy; check with landlord prior to
      site visit; pile of gravel in road, etc.).

----------------------------             ----------------------------
Owner:                                   Vendor acknowledgement:

----------------------------             ----------------------------
Date:                                    Date
<PAGE>

                                 ATTACHMENT 1
                                      TO
                                 SCHEDULE B-1
                            COMMISSIONING CRITERIA

                 Metrocell                          Cascade #
--------------------------------------------------------------------------------

<TABLE>
<CAPTION>
<S>                                                          <C>
         SITE                                 START DATE
             ------------------------                   ------------------------
      PROJECT                                    COEO
             ------------------------                   ------------------------
     LOCATION                                  COMPLETED
             ------------------------                   ------------------------
</TABLE>

<TABLE>
<CAPTION>
                                                                                    VENDOR           OWNER
   SECTION                                   NAME                                           INITIALS
<S>              <C>                                                             <C>             <C>
---------------------------------------------------------------------------------------------------------------
08-0268          Outdoor CDMA Metrocell DE Handling & Securing
---------------------------------------------------------------------------------------------------------------
08-0269          Outdoor CDMA Metrocell RE Handling & Securing
---------------------------------------------------------------------------------------------------------------
                 Outdoor CDMA Metrocell EBE Handling & Securing
---------------------------------------------------------------------------------------------------------------
18-0270          Outdoor CDMA Metrocell System Cabling
---------------------------------------------------------------------------------------------------------------
18-0262          CDMA Metrocell Carrier Growth
---------------------------------------------------------------------------------------------------------------
22-0272          CDMA Metrocell Preparation & Power Up
---------------------------------------------------------------------------------------------------------------
24-0273          Outdoor CDMA Metrocell Fault Isolation Testing
---------------------------------------------------------------------------------------------------------------
24-0271          Outdoor CDMA Metrocell Helios 3500 Configuration
---------------------------------------------------------------------------------------------------------------
26-0321          CDMA Metrocell and Minicell GPSTM installation and
                 Configuring
---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------
SSP              CDMA Cell CallP Test                                                                 N/A
---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------
                 NOTE:
---------------------------------------------------------------------------------------------------------------
                 No Section Is To Be NA'd Without ITAS Approval
---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------------------
                 N/A = No Customer Signature Required
---------------------------------------------------------------------------------------------------------------
</TABLE>

Vendor Rep____________________________ Owner Rep____________________________
<PAGE>

                                 ATTACHMENT 2

                    Installation and COMMISSIONING CRITERIA

Upon completion of installation, if the Vendor is not performing commissioning
activities, or commissioning activities by Vendor, Owner shall within [*],
either (i) accept the Site as being in compliance with the Specifications; (ii)
accept the Site "as is"; or (iii) provide the Vendor a "punch list" noting in
reasonable detail any deficiencies resulting from the Vendor's non-compliance
with the Specifications. In the case of (i) or (ii) above, the Owner will
promptly acknowledge Acceptance of the installation and/or commissioning work in
writing in the format set forth in this Attachment 2 to Exhibit B3, and in the
case of (iii) above, such written acknowledgement shall be provided promptly
upon the Vendor's correction of the punch list items. The failure of Owner to
notify Vendor within [*] after completion of installation and/or commissioning
activities (or, in the case of correction, [*] following such correction) of any
particulars in which the Products do not meet the Installation and/or
Commissioning Criteria, shall be deemed to constitute Owner's acceptance of such
installation and/or commissioning Services.

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment.  The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                   EXHIBIT M
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

             RF ENGINEERING DESIGN SERVICES FOR NEW NETWORK DESIGN

1.0  INTRODUCTION

     This RF engineering design Services ("RF Engineering Design Services")
     Statement of Work defines the work requirements and responsibilities of
     Owner and Vendor with respect to performing RF Engineering Design Services.

     Vendor's obligation to perform RF Engineering Design Services assumes
     receipt and acceptance of a valid Purchase Order for such Services;
     provided that, such Purchase Order shall include the Entrance Criteria
     listed in Section 2.0 below.

     The RF Engineering Design Services for the design of a new System involves
     the three step process set forth below for the identification of the
     minimum number of cell sites required to achieve Owner's design objectives.

 [Ten Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT N
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                           RF OPTIMIZATION SERVICES

1.0  Introduction

     This RF optimization Services ("RF Optimization Services") Statement of
     Work defines the work requirements and responsibilities of Owner and Vendor
     with respect to performing RF Optimization Services.  Vendor will provide
     the following:  classification of morphologies, analysis of propagation
     characteristics, development of an appropriate PN plan, performing path
     balancing, handoff cluster optimization and a final drive test.

     Vendor's obligation to perform RF Optimization Services assumes receipt and
     acceptance of a valid Purchase Order for such services; provided that, such
     Purchase Orders shall include the Entrance Criteria listed in Section 2.0
     below.

    [Eleven Pages of Technical Information Deleted Pursuant to Confidential
                               Treatment Request]
<PAGE>

                                   EXHIBIT O
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                              NETWORK INTEGRATION

1.0  "Network Integration Services" shall mean Vendor's on-site technical
     support Services for the optimization and/or operation and maintenance of
     the BTS, Switch and BSM, to be specified in a Purchase Order accepted by
     Vendor.  Unless provided in the applicable pricing Exhibit of the
     Agreement, Vendor shall provide the price(s) for such Network Integration
     Services to Owner upon request on an as-quoted basis, which Services are
     further described below:

[Three Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT P
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                            PRODUCT SPECIFICATIONS

--------------------------------------------------------------------------------

Table of Contents
The DMS-MTX.............................................    1
Power requirements and environmental conditions.........    4
Physical dimensions.....................................    5
The Base Station Controller.............................    5
Operational Specifications..............................    6
Network Overview........................................    7
Architectural overview..................................    8
BSC capacity............................................   10
BSC physical specifications.............................   12
CDMA Metro Cell.........................................   14
CDMA Metro Cell Technical Specifications................   15
CDMA MiniCell...........................................   15
Minicell Technical Specifications.......................   16
Regulatory Specifications for Metro Cell and Minicell...   16

The DMS-MTX switch is a member of Nortel Networks' DMS family of digital
  switching systems. DMS includes six versions of switching systems. All systems
  use a common hardware and software platform with additional software to cover
  the entire range of operator applications.

All DMS systems benefit from a common, ongoing research and development program.
  This program enhances the capabilities of all DMS systems and ensures the
  incorporation of new technologies to all versions of the switch.

The following specifications as stated herein are subject to change from time to
  time.

THE DMS-MTX

  [Twenty-One Pages of Technical Information Deleted Pursuant to Confidential
                               Treatment Request]
<PAGE>

                                   EXHIBIT Q
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                        BASE GENERIC SOFTWARE FEATURES

The following is a list of Vendor's base Software features included in Vendor's
MTXU0008 Base Load.

[Three Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                   EXHIBIT R
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                             DOCUMENTATION/MANUALS

The following list of System Maintenance and Instruction Manuals and System
Operating and Configuring Manuals apply to the Products provided under the
Agreement and are available through Vendor's computer-based information system
("HELMSMAN").

HELMSMAN CD-ROM:  Includes one (1) compact disc and one (1) application program;
CD-ROM reader and interface card are optionally available through Vendor for use
on Owner-supplied DOS personal computer.  Updates are available at additional
costs.  (Documents not available on compact disc will be provided in paper
format.)
<TABLE>
<CAPTION>

<S>                                                                              <C>
Helmsman 4.1.1 Windows User Guide............................................           P632202.01
Helios TCM/48 Temperature Compensation Module................................    167-4701-10202.00
Helios BMU Battery Management Unit...........................................    167-8001-11008.00
Helios System 200/48 Manual..................................................    167-9021-10904.00
MPR25/MPR15 Series Single Phase -48V.........................................    169-2071-50007.00
North American DMS-100 Service priority classification descript..............    297-0201-01501.03
Cutover Conversion Services Customer Grooming Method of Proc.................    297-0301-30102.05
North American DMS-100 Electrostatic Discharge Protection Guide..............    297-1001-01002.03
Maintenance System Maintenance Guide.........................................    297-1001-10601.02
Maintenance - Administration Tools Description...............................    297-1001-10701.02
CMIS Equipment Cabinet Planning - Engineering  Guide.........................    297-1001-10901.02
Magnetic Tape Reference Manual...............................................    297-1001-11803.03
AMA - NT Format Reference Guide..............................................    297-1001-11918.04
Automatic Trunk Testing Description..........................................    297-1001-12103.02
Alarm System Description.....................................................    297-1001-12205.01
Journal File Description.....................................................    297-1001-12703.03
Input/Output System Reference Manual.........................................    297-1001-12906.04
Synchronous Clock System Description Description.............................    297-1001-13003.03
DMS-100 Ringing System General Description...................................    297-1001-13104.02
Blue Box Fraud Detection Feature Description.................................    297-1001-13202.02
Trunk Selection - Compatibility Reference....................................    297-1001-15201.04
Peripheral - Trunk group/Line Assignments Reference guide....................    297-1001-15501.02
Power Distribution - Grounding Guide User Guide..............................    297-1001-15603.07
Grounding Audit Procedures Procedural Manual.................................    297-1001-15802.03
Basic Administration Procedures..............................................    297-1001-30003.06
SuperNode Conversion Procedures..............................................    297-1001-30201.07
ONP-HYBRID Software Delivery Procedures......................................    297-1001-30304.01
DMS100 Family Capacity Administration Guide..................................    297-1001-30403.02
DMS100 Family Memory Administration Guide....................................    297-1001-30504.03
Loading Administration Guide.................................................    297-1001-30603.02
Service Problem Analysis Administration Guide................................    297-1001-31804.02
SPMS Application Guide.......................................................    297-1001-33011.04
DIRP Administration Guide....................................................    297-1001-34501.06
Digital Switching Systems Power - Grounding Routine Maintenance..............    297-1001-35002.02
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                              <C>
Basic Translations Tools Guide...............................................    297-1001-36004.05
Provisioning.................................................................    297-1001-45028.01
Network Management System Reference Manual...................................    297-1001-45310.06
DMS-100 Family Software Package to Data Cross Reference......................    297-1001-45620.01
Maintenance System Man-Machine Interface Description.........................    297-1001-52003.04
Automatic Board-To-Board Testing Reference Manual............................    297-1001-52205.04
Remote Data Polling System Description.......................................    297-1001-52409.01
Data Packet Controller Reference Manual......................................    297-1001-52503.01
Disk Maintenance Subsystem Reference Manual..................................    297-1001-52609.01
DRAM DRAM - EDRAM Guide......................................................    297-1001-52713.05
Conference Circuit Guide.....................................................    297-1001-53003.05
Common Channel Signaling 7 Maintenance Reference Manual......................    297-1001-53106.01
Bit Error Rate Performance Testing Testing Reference.........................    297-1001-53307.01
Maintenance Managers Morning Report..........................................    297-1001-53503.04
DPP Hardware Component Replacement Guide.....................................    297-1001-53901.02
DPP Commands and Messages Guide..............................................    297-1001-54501.04
NORESTARTSWACT/MTCSWACT User's Guide.........................................    297-1001-54603.01
DPP Maintenance Procedures Guide.............................................    297-1001-54701.01
Bellcore Format AMA Maintenance Guide........................................    297-1001-57001.01
Input/Output Devices Maintenance Guide.......................................    297-1001-59004.12
Networks Maintenance Guide...................................................    297-1001-59104.03
Peripheral Modules Maintenance Guide.........................................    297-1001-59210.01
External Devices Maintenance Guide...........................................    297-1001-59304.01
Trunks Maintenance Guide.....................................................    297-1001-59505.01
Commands Reference Manual....................................................    297-1001-82208.02
Glossary of Terms - Abbreviations Reference Manual...........................    297-1001-82504.02
Bellcore Format AMA Reference Guide..........................................    297-1001-83019.01
Equal Access Maintenance Guide...............................................    297-2101-50004.01
PCM30 Line Drawer Maintenance Guide..........................................    297-2101-50402.01
SDMC OM Data Delivery Application User Guide.................................    297-2667-32102.02
SuperNode Patching Procedures................................................    297-5001-54005.03
DMS SN & DMS SN SE Computing Module Maintenance Guide........................    297-5001-54810.03
DMS SN & DMS SN SE Message Switch Maintenance Guide..........................    297-5001-54907.03
DMS SuperNode SE Alarm - Performance Monitoring Procedures...................    297-5301-54304.01
SDM SuperNode Billing Application Application Guide..........................    297-5051-30003.02
SuperNode Data Manager User Guide............................................    297-5051-90402.01
SDM ASCII Terminal Access User Guide.........................................    297-5051-90501.01
SuperNode Data Manager User Guide............................................    297-5051-91204.05
SuperNode Data Manager User Guide............................................    297-5051-91301.01
SuperNode Data Manager Fault-tolerant User Guide.............................    297-5061-90602.02
North American DMS-100 OAM&P Change Document Reference Manual................    297-8001-10004.01
DMS-100 Alarm Clearing - Perform. Monitoring Proc. Vol. 1 of 4...............   297-8001-543110.02
DMS-100 Alarm Clearing - Perform. Monitoring Proc. Vol. 2 of  4..............   297-8001-543210.02
DMS-100 Alarm Clearing - Perform. Monitoring Proc. Vol. 3 of 4...............   297-8001-543310.02
DMS-100 Alarm Clearing - Perform. Monitoring Proc. Vol. 4 of  4..............   297-8001-543410.02
NA DMS-100 OAM&P Change Document Reference Manual Volume 1 of 2..............   297-8021-100106.03
NA DMS-100 OAM&P Change Document Reference Manual Volume 2 of 2..............   297-8021-100206.03
NA DMS-100 Alarm Clearing - Perform Monitoring Proc Vol 1 of  4..............   297-8021-543110.02
NA DMS-100 Alarm Clearing - Perform Monitoring Proc Vol 2 of  4..............   297-8021-543210.02
NA DMS-100 Alarm Clearing - Perform Monitoring Proc Vol 3 of  4..............   297-8021-543310.02
NA DMS-100 Alarm Clearing - Perform Monitoring Proc Vol 4 of  4..............   297-8021-543410.02
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                              <C>
SMU Maintenance Manual.......................................................    297-8241-55009.01
XPM Operational Measurements Reference Manual................................    297-8321-81409.02
XPM Translations Reference Manual Volume 1 of 3..............................   297-8321-815111.02
XPM Translations Reference Manual Volume 2 of  3.............................   297-8321-815211.02
XPM Translations Reference Manual Volume 3 of  3.............................   297-8321-815311.02
Extended Peripheral Module Logs Reference Manual.............................    297-8321-84010.02
Extended Peripheral Module Int'l Operational Measurements Ref................    297-8331-81407.01
Extended Peripheral Module International Translations Reference..............    297-8331-81509.01
Extended Peripheral Module International Logs Reference Manual...............    297-8331-84007.01
North American DMS-100 Peripheral Module Software Release Doc................    297-8981-59908.03
DMS-10 - DMS-100.....................................................297-8991-001297-8991-00104.02
DMS-10 - DMS-100 Cancellation Cross-reference Directory......................    297-8991-00204.04
Software Delivery Process Description........................................    297-8991-02001.01
Software Delivery Planning and Provisioning..................................    297-8991-02101.01
DMS-INode Functionality Description Reference Manual.........................    297-8991-10001.01
ONP Software Delivery Procedures, Vol. 1 of 2................................   297-8991-303110.04
ONP Software Delivery Procedures, (XA-Core) Vol. 1 of 2......................   297-8991-303210.04
Cutover Manual XA-Core Cutover Procedures Manual.............................    297-8991-30701.04
DMS100 Family XA-Core Maintenance Manual.....................................    297-8991-51002.02
DMS100 Family XA-Core Maintenance Guide......................................    297-8991-51102.02
Post-Release Software Manager (PRSM) Reference Guide.........................    297-8991-54007.03
Hardware Description Manual Volume 1 of 5....................................   297-8991-805106.01
Hardware Description Manual Volume 2 of 5....................................   297-8991-805206.01
Hardware Description Manual Volume 3 of 5....................................   297-8991-805306.01
Hardware Description Manual Volume 4 of 5....................................   297-8991-805406.01
Hardware Description Manual Volume 5 of 5....................................   297-8991-805506.01
DMS100 Family XA-Core Reference Manual.......................................    297-8991-81002.02
Software Optionality Control user Manual.....................................    297-8991-90108.01
DMS100 Family Ethernet Interface Unit User Guide.............................    297-8991-91002.02
Introduction to the New North America DMS-100 Product Structure..............        50104.1601.01
BCS to PCL Mapping...........................................................        50105.1601.02
DMS Switching Evolution Transition Guide.....................................        50111.1601.01
DMS-100 Capacity Planner.....................................................        50112.1601.01
DMS-100 Software Portfolio...................................................        50170.1101.01
Expanded Carrier Identification Code Planner for Feature Group...............        57003.1601.01
DMS-100 Feature Description Manual...........................................    PLN-1001-00327.01
DMS SuperNode Technical Specification........................................    PLN-5001-00102.08
LEC0011 North American DMS-100 Release Document Volume 1 of 3................   PLN-8001-004109.02
LEC0011 North American DMS-100 Release Document Volume 2 of 3................   PLN-8001-004209.02
LEC0011 North American DMS-100 Release Document Volume 3 of 3................   PLN-8001-004309.02
LET0011 North American DMS-100 Release Document Volume 1 of 3................   PLN-8021-004109.02
LET0011 North American DMS-100 Release Document Volume 2 of 3................   PLN-8021-004209.02
LET0011 North American DMS-100 Release Document Volume 3 of 3................   PLN-8021-004309.02
ALL PRODUCTS COMPUTING-MODULE LOADS..........................................   PLN-8991-103105.03
ALL PRODUCTS COMPUTING-MODULE LOADS..........................................   PLN-8991-103205.03
ALL PRODUCTS COMPUTING-MODULE LOADS..........................................   PLN-8991-103305.03
ALL PRODUCTS COMPUTING-MODULE LOADS..........................................   PLN-8991-103405.03
Provisioning Manual - Active Detail Volume 1 of 4............................   PLN-8991-104105.03
Provisioning Manual - Active Detail Volume 2 of 4............................   PLN-8991-104205.03
Provisioning Manual - Active Detail Volume 3 of 4............................   PLN-8991-104305.03
Provisioning Manual - Active Detail Volume 4 of 4............................   PLN-8991-104405.03
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                              <C>
Listing of TAMs Technical Assistance Manual..................................    TAM-1001-00010.03
TAS Nonresident Tool Listing Technical Assistance Manual.....................    TAM-1001-00110.03
DISPCALL User Guide..........................................................    TAM-1001-00303.01
PMDEBUG Technical Assistance Manual..........................................    TAM-1001-00409.03
PMIST Technical Assistance Manual............................................    TAM-1001-00708.02
DEBUG Technical Assistance Manual............................................    TAM-1001-00803.02
Data Layout Manual Reference Manual..........................................    TAM-1001-01104.01
CallTrak User Guide..........................................................    TAM-1001-01201.01
MPCDebug User Guide..........................................................    TAM-1001-01301.01
SCANLOG User Guide...........................................................    TAM-1001-01401.02
C7TU Technical Assistance Manual.............................................    TAM-1001-01502.02
Super Nonresident Tool Listing Technical Assistance Manual...................    TAM-1001-01602.03
Automatic Message Accounting (AMA) Tools User Guide..........................    TAM-1001-01701.01
DMS-MTX Capacity Planning Guidelines for AMPS/TDMA...........................    411-2131-00903.02
DMS-MTX - Cell Site Hardware Product Guide...................................    411-2131-10010.01
Electrostatic Discharge Protection...........................................    411-2131-11301.01
DMS-MTX Equal Access Guide...................................................    411-2131-13603.02
DMS-MTX Authentication Deployment Guide - Reference..........................    411-2131-14103.02
DMS-MTX Authentication Center Deployment - Reference.........................    411-2131-14202.02
DMS-MTX Standalone Home Location Register (S-HLR)............................    411-2131-14302.02
DMS-MTX Short Message Service Application Guide..............................    411-2131-15204.02
MTX08 Software Delta for Planners Vol. 1 of 4................................   411-2131-199109.05
MTX08 Software Delta for Planners Vol. 2 of 4................................   411-2131-199209.05
MTX08 Software Delta for Planners Vol. 3 of 4................................   411-2131-199309.05
MTX08 Software Delta for Planners Vol. 4 of 4................................   411-2131-199409.05
DMS-MTX Billing Management Manual............................................    411-2131-20407.02
DMS-MTX Automatic File Transfer Application Guide............................    411-2131-20503.02
DMS-MTX Basic Cellular Translations..........................................    411-2131-22007.02
DMS-MTX One Night Process Software Delivery..................................    411-2131-30306.02
DMS-MTX International Tones - Signaling Applications.........................    411-2131-44107.02
DMS-MTX Customer Data Schema Reference Manual Vol. 1 of 3....................   411-2131-451110.03
DMS-MTX Customer Data Schema Reference Manual Vol. 2 of 3....................   411-2131-451210.03
DMS-MTX Customer Data Schema Reference Manual Vol. 3 of 3....................   411-2131-451310.03
DMS-MTX Office Parameters Reference Manual...................................    411-2131-45510.03
CDMA Circuit Switched Data Deployment Guide..................................    411-2131-50001.03
DMS-MTX TDMA Circuit Switched Data Deployment Guide..........................    411-2131-50101.03
DMS-MTX Logs Reference Manual................................................    411-2131-51010.03
DMS-MTX IS-41 Networking for X.25/CCS7 Guide.................................    411-2131-55402.03
DMS-MTX CDPD Deployment Guide................................................    411-2131-56207.02
DMS-MTX CDPD Handbook........................................................    411-2131-56307.02
DMS-MTX CDPD IP/CNLP.........................................................    411-2131-56405.02
DMS-MTX PM Software Release Document Supporting PRSM.........................    411-2131-59803.04
DMS-MTX MAPS Command Reference Vol. 1 of 4...................................   411-2131-809110.03
DMS-MTX MAPS Command Reference Vol. 2 of 4...................................   411-2131-809210.03
DMS-MTX MAPS Command Reference Vol. 3 of 4...................................   411-2131-809310.03
DMS-MTX MAPS Command Reference Vol. 4 of 4...................................   411-2131-809410.03
DMS-MTX Fraud Prevention - Detection Reference Manual........................    411-2131-81003.02
DMS-MTX Operational Measurements Reference Manual............................    411-2131-81410.02
DMS-MTX Glossary of Terms and Abbreviations..................................    411-2131-82507.02
DMS-MTX Operational Measurements Quick Reference Manual......................    411-2131-90004.02
DMS-MTX Logs Quick Reference Guide...........................................    411-2131-90102.02
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                              <C>
CDMA RF Optimization Guide...................................................    411-2133-00401.02
CDMA Metro Cell Carrier Growth...............................................    411-2133-00802.02
CDMA BSC Theory of Operations................................................    411-2133-10107.04
CDMA 800 MHz BTS Functional Operations Overview..............................    411-2133-10203.03
CDMA Base Station Manager User's Guide.......................................    411-2133-10305.02
CDMA BSS Manager Configuration Reference Manual..............................    411-2133-10405.02
CDMA BSS Manager Software Installation Guide.................................    411-2133-10503.02
CDMA Base Station Subsystem Manager..........................................    411-2133-10603.02
CDMA Metro Cell & Minicell Functional Description Manual.....................    411-2133-11002.18
CDMA Metro Cell Deployment Guidelines Reference Manual.......................    411-2133-11101.07
CDMA T1 Based Inter-System/Intra-BSC Soft Handoff............................    411-2133-12104.04
CDMA Second Carrier Deployment Handbook......................................    411-2133-12203.02
CDMA Six Sector Cell Applications Handbook...................................    411-2133-12301.01
MTX Planning Guide...........................................................    411-2133-13003.02
CDMA NBSS Software Delta for Planners Manual.................................    411-2133-19906.02
CDMA NBSS8.1 Software Delta for Planners.....................................    411-2133-19907.06
CDMA Minicell Pre-installation Manual........................................    411-2133-20201.03
CDMA Channel Data Services Unit (CDSU).......................................    411-2133-20401.05
CDMA Resource Management Unit Enhanced Selector Card.........................    411-2133-20501.01
CDMA RF Design Guidelines....................................................    411-2133-30101.01
CDMA 1900 MHz Outdoor BTS Maintenance - Troubleshooting......................    411-2133-50004.04
CDMA BSC Maintenance and Troubleshooting.....................................    411-2133-50108.04
CDMA 800 MHz BTS Maintenance - Troubleshooting Guide.........................    411-2133-50203.02
CDMA 1900MHz BTS RF Troubleshooting Guide....................................    411-2133-50401.04
CDMA 1900 MHz Indoor BTS Maintenance - Troubleshooting.......................    411-2133-50503.02
CDMA Metro Cell System - RF Datafill Parameters..............................    411-2133-50601.04
CDMA 800 MHz FCP BTS Functional Operations...................................    411-2133-50701.04
CDMA 800 MHz FCP BTS Maintenance - Troubleshooting Guide.....................    411-2133-50801.03
CDMA NBSS Alarms Reference Manual Volume 1 of  2.............................   411-2133-530105.03
CDMA NBSS Alarms Reference Manual Volume 2 of  2.............................   411-2133-530205.03
CDMA NBSS Alarms Delta Reference Manual......................................    411-2133-53103.04
CDMA NBSS Operational Measurements...........................................    411-2133-53504.02
CDMA Base Station Manager....................................................    411-2133-54006.02
CDMA Base Station Subsystem Manager..........................................    411-2133-54103.03
CDMA Fault Management - Recovery Guide.......................................    411-2133-54504.04
CDMA Metro Cell & Minicell Maintenance & Troubleshooting.....................    411-2133-55003.04
CDMA 800 MHz Schroff BTS RF Troubleshooting Guide............................    411-2133-56001.01
CDMA Log File Format and Managed Objects.....................................    411-2133-81005.02
CDMA Dual BSC Deployment Guide...............................................    411-2133-90301.02
CDMA BSS Manager Journaling Quick Reference Guide............................    411-2133-90401.02
CDMA Verilink Access System 2000 T1/E1 CDSU User Manual......................    411-2133-91201.02
CDMA BTS Maintenance Unit (BMU) User Guide...................................    411-2133-92002.03
CDMA BSM Tools Users Guide...................................................    411-2133-93004.02
CDMA ATM Networking Deployment Guide.........................................    411-2133-93502.06
Base/Telecom Translations Guide Volume 1 of 2................................   411-3001-220108.03
Base/Telecom Translations Guide Volume 2 of 2................................   411-3001-220208.03
Base/Telecom Customer Service Data Schema Volume 1 of  4.....................   411-3001-451108.03
Base/Telecom Customer Service Data Schema Volume 2 of  4.....................   411-3001-451208.03
Base/Telecom Customer Service Data Schema Volume 3 of  4.....................   411-3001-451308.03
Base/Telecom Customer Service Data Schema Volume 4 of  4.....................   411-3001-451408.03
Base/Telecom Office Parameters Reference Manual..............................    411-3001-45508.03
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                              <C>
Base/Telecom Log Reports Reference Manual Volume 1 of 5......................   411-3001-510108.03
Base/Telecom Log Reports Reference Manual Volume 2 of 5......................   411-3001-510208.03
Base/Telecom Log Reports Reference Manual Volume 3 of 5......................   411-3001-510308.03
Base/Telecom Log Reports Reference Manual Volume 4 of 5......................   411-3001-510408.03
Base/Telecom Log Reports Reference Manual Volume 5 of 5......................   411-3001-510508.03
Alarm Clearing - Performance Monitoring Procedures Vol. 1 of 3...............   411-3001-543108.03
Alarm Clearing - Performance Monitoring Procedures Vol. 2 of 3...............   411-3001-543208.03
Alarm Clearing - Performance Monitoring Procedures Vol. 3 of 3...............   411-3001-543308.03
Base/Telecom Trouble Locating - Clearing Procedures..........................    411-3001-54408.03
Base/Telecom Recovery Procedures.............................................    411-3001-54508.03
Base/Telecom Routine Maintenance Procedures..................................    411-3001-54608.03
Base/Telecom Card Replacement Procedures Volume 1 of 3.......................   411-3001-547108.03
Base/Telecom Card Replacement Procedures Volume 2 of 3.......................   411-3001-547208.03
Base/Telecom Card Replacement Procedures Volume 3 of 3.......................   411-3001-547308.03
Operational Measurements Reference Manual Vol. 1 of 3........................   411-3001-814108.03
Operational Measurements Reference Manual Vol. 2 of 3........................   411-3001-814208.03
Operational Measurements Reference Manual Vol. 3 of 3........................   411-3001-814308.03
Base/Telecom XPM Log Report Reference Manual.................................    411-3003-51005.01
Base/Telecom XPM Maintenance Procedures......................................    411-3003-54005.01
Base/Telecom Alarm Clearing Procedures.......................................    411-3003-54305.01
</TABLE>
<PAGE>

                                   EXHIBIT S
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

            AVAILABILITY OF INTEROPERABILITY SPECIFICATION ("IOS")

Vendor currently offers CDMA Development Group ("CDG") IOS V2.0A compliant
Software, as part of the MTX08 release, which is currently commercially
available.

The following features listed below are included in IOS 2.0A:

[Three Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT T-1
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                         VENDOR TAS WARRANTY SERVICES

1.0      TAS WARRANTY SERVICES

1.1      If Owner experiences operational difficulties, Owner may contact
         Vendor's Technical Assistance Service (TAS) Department. Special remote
         terminals in the TAS center are used to communicate with Owner's System
         to diagnose fault conditions and recommend corrective action.

[Four Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

                                  EXHIBIT T-2
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                           OEM EQUIPMENT WARRANTIES

          In accordance with Section 18.1 of the Agreement, OEM Equipment will
be warrantied by the Vendor on a pass-through basis only.  Vendor assumes no
liability for the warranty claims of the Owner for such OEM Equipment. In the
event that OEM Equipment provided to Owner hereunder carries less than a one (1)
year pass-through warranty, Vendor shall provide notice to Owner of such
warranty and Owner shall be offered the opportunity to cancel that portion of
the applicable Purchase Order relating to the purchase/license of such OEM
Equipment.

Products covered by Vendor's warranties in accordance with in Section 18
(Warranties) of the Agreement are as follows:

         DMS-MTX (including DC power)
         CDMA-BSCs
         CDMA-BTS (including DC power)
         Nortel manufactured ATM Switch Equipment
         Nortel manufactured Packet Data Switch Network

Vendor may identify other products from time-to-time that shall be covered by
Vendor's Warranty.

Some examples of OEM Equipment follows.  However, the list is not exhaustive and
is provided for informational purposes only.

[***]

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment.  The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                   EXHIBIT U
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                               REPAIR AND RETURN

Introduction

This Exhibit provides the Owner with instructions for obtaining Product repair
services for all Equipment purchased from Vendor.

How To Process Repair Orders

[Four Pages of Technical Information Deleted Pursuant to Confidential Treatment
                                    Request]
<PAGE>

NORTEL                                                              NORTEL
                                                                        NETWORKS
                                                   How the world shares ideas.

                              FAX - IN ORDER FORM
                                                                   Page __ of __
COMPANY:                                                        Nortel Use Only
CITY & STATE:                                                   ORDER / RMA#
CUSTOMER / SITE / ID # / Project Number:                        ____________
PURCHASE ORDER #                                                Nortel Use Only
NAME OF CONTACT PERSON:                           Fax Number:
TYPE OF SYSTEM:       DMS-10    DMS-100    BOC     IOC     OTHER

                               MATERIAL REQUIRED
#        Qty.                 PEC / CPC / Part #                Warranty Date
1
2
3
4
5
6
7
8
9
10

                                           Ship to:  Nortel
                                                 400 Industrial, Ste 200
                                                 Richardson, Tx 75081
<PAGE>

                                   EXHIBIT V
                                    TO THE
                         CRICKET COMMUNICATIONS, INC.
                      SYSTEM EQUIPMENT PURCHASE AGREEMENT

                                  AFFILIATES

Chase Telecommunications, Inc.<PAGE>

                                                                   EXHIBIT 10.36

                               CREDIT AGREEMENT

                          dated as of August 28, 2000

                                     among

                    CRICKET COMMUNICATIONS HOLDINGS, INC.,

                         CRICKET COMMUNICATIONS, INC.,

                           The Lenders Party Hereto,

                                      and

                             NORTEL NETWORKS INC.,
                            as Administrative Agent

CERTAIN MATERIAL (INDICATED BY AN ASTERISK) HAS BEEN OMITTED FROM THIS DOCUMENT
PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED MATERIAL HAS
BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
<PAGE>

                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<CAPTION>
                                                                                                                         Page
                                                                                                                         ----
<S>                                                                                                                      <C>
ARTICLE I - Definitions..........................................................................................          1
         Section 1.01      Defined Terms.........................................................................          1
         Section 1.02      Classification of Loans and Borrowings................................................         25
         Section 1.03      Terms Generally.......................................................................         25
         Section 1.04      Accounting Terms; GAAP; Consolidation of License Subsidiaries.........................         25

ARTICLE II - The Loans...........................................................................................         26
         Section 2.01      Commitments...........................................................................         26
         Section 2.02      Loans and Borrowings..................................................................         26
         Section 2.03      Requests for Borrowings...............................................................         27
         Section 2.04      Funding of Borrowings.................................................................         28
         Section 2.05      Interest Elections....................................................................         29
         Section 2.06      Termination and Reduction of Commitments..............................................         30
         Section 2.07      Repayment of Loans; Evidence of Debt..................................................         30
         Section 2.08      Amortization of Loans.................................................................         31
         Section 2.09      Prepayment of Loans...................................................................         32
         Section 2.10      Fees..................................................................................         34
         Section 2.11      Interest..............................................................................         35
         Section 2.12      Alternate Rate of Interest............................................................         35
         Section 2.13      Increased Costs.......................................................................         36
         Section 2.14      Break Funding Payments................................................................         37
         Section 2.15      Taxes.................................................................................         37
         Section 2.16      Payments Generally; Pro Rata Treatment; Sharing of Set-Offs...........................         38
         Section 2.17      Mitigation Obligations; Replacement of Lenders........................................         39

ARTICLE III - Representations and Warranties.....................................................................         40
         Section 3.01      Organization; Powers..................................................................         40
         Section 3.02      Authorization; Enforceability.........................................................         40
         Section 3.03      Governmental Approvals; No Conflicts..................................................         41
         Section 3.04      Financial Condition; No Material Adverse Change.......................................         41
         Section 3.05      Properties and Licenses...............................................................         41
         Section 3.06      Litigation and Environmental Matters..................................................         42
         Section 3.07      Compliance with Laws and Agreements...................................................         43
         Section 3.08      Investment and Holding Company Status.................................................         43
         Section 3.09      Taxes.................................................................................         43
         Section 3.10      ERISA.................................................................................         43
         Section 3.11      Disclosure............................................................................         43
         Section 3.12      Subsidiaries..........................................................................         44
         Section 3.13      Insurance.............................................................................         44
         Section 3.14      Labor Matters.........................................................................         44
         Section 3.15      Purchase Agreement....................................................................         44
         Section 3.16      Year 2000.............................................................................         44
</TABLE>

CREDIT AGREEMENT - Page i

<PAGE>

<TABLE>
<S>                                                                                                                       <C>
         Section 3.17      Certain Matters Relating to ChaseTel..................................................         44
         Section 3.18      Other Credit Agreements...............................................................         45
         Section 3.19      Eligible Secured Debt.................................................................         45

ARTICLE IV - Conditions..........................................................................................         45
         Section 4.01      Effective Date........................................................................         45
         Section 4.02      Initial Availability Date.............................................................         46
         Section 4.03      [Reserved]............................................................................         48
         Section 4.04      Each Borrowing........................................................................         48

ARTICLE V - Affirmative Covenants................................................................................         48
         Section 5.01      Financial Statements and Other Information............................................         48
         Section 5.02      Notices of Material Events............................................................         50
         Section 5.03      Information Regarding Collateral......................................................         51
         Section 5.04      Existence; Conduct of Business........................................................         51
         Section 5.05      Payment of Obligations................................................................         52
         Section 5.06      Maintenance of Properties.............................................................         52
         Section 5.07      Insurance.............................................................................         52
         Section 5.08      Books and Records; Inspection Rights..................................................         53
         Section 5.09      Compliance with Laws and Agreements...................................................         53
         Section 5.10      Use of Proceeds.......................................................................         53
         Section 5.11      Additional Subsidiaries...............................................................         53
         Section 5.12      Further Assurances....................................................................         53
         Section 5.13      Casualty and Condemnation.............................................................         54
         Section 5.14      Interest Rate Protection..............................................................         55
         Section 5.15      Intercompany Agreements...............................................................         55
         Section 5.16      Agreement regarding FCC Licenses......................................................         55
         Section 5.17      Subordination of ChaseTel Earnout.....................................................         55

ARTICLE VI - Negative Covenants..................................................................................         55
         Section 6.01      Indebtedness; Preferred Stock.........................................................         55
         Section 6.02      Liens.................................................................................         57
         Section 6.03      Fundamental Changes; Corporate Structure..............................................         58
         Section 6.04      Investments, Loans, Advances, Guarantees and Acquisitions; Asset Sales................         59
         Section 6.05      Hedging Agreements....................................................................         60
         Section 6.06      Restricted Payments...................................................................         60
         Section 6.07      Transactions with Affiliates..........................................................         61
         Section 6.08      Restrictive Agreements................................................................         62
         Section 6.09      Repayment of Indebtedness.............................................................         62
         Section 6.10      Intercompany Agreements...............................................................         62
         Section 6.11      Limitation on Sale-Leaseback Transactions.............................................         62
         Section 6.12      Equipment Site Interests and Real Estate Subsidiaries.................................         62
         Section 6.13      FCC Licenses and License Subsidiaries.................................................         62
         Section 6.14      Amendment of Material Documents.......................................................         63
         Section 6.22      Activities of Holdings................................................................         68
</TABLE>

CREDIT AGREEMENT - Page ii

<PAGE>

<TABLE>
<S>                                                                                                                       <C>
         Section 6.24      Additional Requirements regarding Permitted Indebtedness and Liens....................         68

ARTICLE VII - Events of Default..................................................................................         68

ARTICLE VIII - The Agents........................................................................................         71

ARTICLE IX - Miscellaneous.......................................................................................         73
         Section 9.01      Notices...............................................................................         73
         Section 9.02      Waivers; Amendments...................................................................         74
         Section 9.03      Expenses; Indemnity; Damage Waiver. ..................................................         75
         Section 9.04      Successors and Assigns................................................................         76
         Section 9.05      Survival..............................................................................         79
         Section 9.06      Counterparts; Integration; Effectiveness..............................................         79
         Section 9.07      Severability..........................................................................         79
         Section 9.08      Right of Setoff.......................................................................         79
         Section 9.09      Governing Law; Jurisdiction; Consent to Service of Process............................         80
         Section 9.10      WAIVER OF JURY TRIAL..................................................................         80
         Section 9.11      Headings..............................................................................         81
         Section 9.12      Confidentiality.......................................................................         81
         Section 9.13      Interest Rate Limitation..............................................................         81
         Section 9.14      Amendments to Other Credit Agreements.................................................         82
         Section 9.15      Parent Indenture Exception............................................................         83
</TABLE>

                               INDEX TO EXHIBITS
                               -----------------

Exhibit A       -     Form of Assignment and Acceptance Agreement
Exhibit B       -     Form of Amended and Restated Collateral Agency Agreement
Exhibit C       -     Form of Amendment to Indemnity, Subrogation and
                      Contribution Agreement
Exhibit D       -     Form of Parent Agreement
Exhibit E       -     Form of Parent Guarantee
Exhibit F       -     Form of Perfection Certificate
Exhibit G       -     Form of Amendment to Subordination Agreement

                               INDEX TO SCHEDULES
                               ------------------

Schedule 2.01        -     Commitments
Schedule 3.05A       -     Real Property
Schedule 3.05B       -     Licenses
Schedule 3.06        -     Disclosed Matters
Schedule 3.12        -     Subsidiaries
Schedule 3.13        -     Insurance
Schedule 6.01        -     Existing Indebtedness
Schedule 6.02        -     Existing Liens
Schedule 6.08        -     Existing Restrictions

CREDIT AGREEMENT - Page iii

<PAGE>

                               CREDIT AGREEMENT
                               ----------------

          CREDIT AGREEMENT dated as of August 28, 2000, among CRICKET
     COMMUNICATIONS HOLDINGS, INC., a Delaware corporation, CRICKET
     COMMUNICATIONS, INC., a Delaware corporation, the LENDERS party
     hereto, and NORTEL NETWORKS INC., as Administrative Agent.

     The parties hereto agree as follows:

                                   ARTICLE I

                                  Definitions
                                  -----------

     Section 1.01  Defined Terms.  As used in this Agreement, the following
                   -------------
terms have the meanings specified below:

     "ABR", when used in reference to any Loan or Borrowing, refers to the fact
      ---
that such Loan, or the Loans comprising such Borrowing, are bearing interest at
a rate determined by reference to the Alternate Base Rate.

     "Adjusted LIBO Rate" means, with respect to any LIBOR Borrowing for any
      ------------------
Interest Period, an interest rate per annum (rounded upwards, if necessary, to
the next 1/16 of 1%) equal to (a) the LIBO Rate for such Interest Period
multiplied by (b) the Statutory Reserve Rate.

     "Administrative Agent" means Nortel Networks, in its capacity as
      --------------------
administrative agent for the Lenders hereunder.

     "Administrative Questionnaire" means an administrative questionnaire in a
      ----------------------------
form supplied by the Administrative Agent.

     "Affiliate" means, with respect to a specified Person, another Person that
      ---------
directly, or indirectly through one or more intermediaries, Controls or is
Controlled by or is under common Control with the Person specified.

     "Agents" means the Administrative Agent and the Collateral Agent.
      ------

     "Alternate Base Rate" means, for any day, a rate per annum equal to the
      -------------------
greater of (a) the Prime Rate in effect on such day and (b) the Federal Funds
Effective Rate in effect on such day plus 2 of 1%.  Any change in the Alternate
Base Rate due to a change in the Prime Rate or the Federal Funds Effective Rate
shall be effective from and including the effective date of such change in the
Prime Rate or the Federal Funds Effective Rate, respectively.

     "Annualized EBITDA" means, as of any date, (a) Consolidated EBITDA for the
      -----------------
period of two consecutive fiscal quarters ended on such date (or, if such date
is not the last day of a fiscal

CREDIT AGREEMENT - Page 1
<PAGE>

quarter, then for the period of two consecutive fiscal quarters most recently
ended prior to such date), multiplied by (b) two.

     "Applicable Margin" means, for any day, the applicable rate per annum set
      -----------------
forth below under the caption "ABR Margin" or "Eurodollar Margin", as the case
                               ----------      -----------------
may be, based on the Leverage Ratio as of the most recent determination date:

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------
                        Leverage Ratio                  ABR Margin            Eurodollar Margin
--------------------------------------------------------------------------------------------------
<S>               <C>                                   <C>                   <C>
Category 1        #4.0 to 1.0                               2.50%                     3.50%
--------------------------------------------------------------------------------------------------

Category 2        *4.0 to 1.0 but #6.0 to 1.0               2.75%                     3.75%
--------------------------------------------------------------------------------------------------

Category 3        *6.0 to 1.0 but #10.0 to 1.0              3.00%                     4.00%
--------------------------------------------------------------------------------------------------

Category 4        *10.0 to 1.0                              3.25%                     4.25%
--------------------------------------------------------------------------------------------------
</TABLE>

* denotes greater than

For purposes of the foregoing, (a) the Leverage Ratio shall be determined as of
the end of each fiscal quarter of the Borrower's fiscal year based upon the
Borrower's consolidated financial statements delivered pursuant to Section
                                                                   -------
5.01(a) or (b) and (b) each change in the Applicable Margin resulting from a
-------    ---
change in the Leverage Ratio shall be effective during the period commencing on
and including the date of delivery to the Administrative Agent of such
consolidated financial statements indicating such change and ending on the date
immediately preceding the effective date of the next such change; provided that
                                                                  --------
the Leverage Ratio shall be deemed to be in Category 4 (i) at any time that an
Event of Default has occurred and is continuing or (ii) if the Borrower fails to
deliver the consolidated financial statements required to be delivered by it
pursuant to Section 5.01(a) or (b) within the period specified therein for
            ---------------    ---
delivery thereof, during the period from the expiration of the period specified
therein for delivery thereof until such consolidated financial statements are
delivered.

     "Assignment and Acceptance" means an assignment and acceptance entered into
      -------------------------
by a Lender and an assignee (with the consent of any party whose consent is
required by Section 9.04), and accepted by the Administrative Agent,
            ------------
substantially in the form of Exhibit A.
                             ---------

     "Availability Period" means the period from and including the Initial
      -------------------
Availability Date to but excluding the earlier of the Availability Termination
Date and the date of termination of the Commitments.

     "Availability Termination Date" means the date that is 36 months after the
      -----------------------------
Effective Date.

     "Board" means the Board of Governors of the Federal Reserve System of the
      -----
United States of America.

     "Borrower" means Cricket Communications, Inc., a Delaware corporation.
      --------

CREDIT AGREEMENT - Page 2
<PAGE>

     "Borrower Pledge Agreement" means the Borrower Pledge Agreement dated as of
      -------------------------
November 24, 1999, among Holdings, the Borrower, the Subsidiary Loan Parties and
the Collateral Agent, as supplemented by Supplement No. 1 dated as of March 20,
2000, Supplement No. 2 dated as of March 20, 2000, Supplement No. 3 dated as of
March 20, 2000, Supplement No. 4 dated as of April 28, 2000, Supplement No. 5
dated as of April 28, 2000, Supplement No. 6 dated as of April 28, 2000,
Supplement No. 7 dated as of April 28, 2000, Supplement No. 8 dated as of April
28, 2000, Supplement No. 9 dated as of April 28, 2000, Supplement No. 10 dated
as of April 28, 2000, Supplement No. 11 dated as of April 28, 2000, Supplement
No. 12 dated as of April 28, 2000, Supplement No. 13 dated as of April 28, 2000,
and Supplement No. 14 dated as of April 28, 2000, true and correct photocopies
of which have been delivered to the Administrative Agent.

     "Borrowing" means a Loan, or group of Loans of the same Type, made,
      ---------
converted or continued on the same date and, in the case of LIBOR Loans, as to
which a single Interest Period is in effect.

     "Borrowing Request" means a request by the Borrower for a Borrowing in
      -----------------
accordance with Section 2.03.
                ------------

     "BTA" means a Basic Trading Area, as defined in Rand McNally Commercial
      ---
Atlas and Marketing Guide and used by the Federal Communications Commission in
connection with the award of wireless telecommunications licenses.

     "Business Day" means any day that is not a Saturday, Sunday or other day on
      ------------
which commercial banks in New York City are authorized or required by law to
remain closed; provided that, when used in connection with a LIBOR Loan, the
term "Business Day" shall also exclude any day on which banks are not open for
      ------------
dealings in dollar deposits in the London interbank market.

     "Business Plan" means, for any fiscal year, the business plan of the
      -------------
Borrower and the Subsidiaries for such fiscal year.

     "Capital Expenditures" means, for any period, (a) the additions to
      --------------------
property, plant and equipment and other capital expenditures of the Borrower and
its Subsidiaries that are (or would be) set forth in a consolidated statement of
cash flows of the Borrower for such period prepared in accordance with GAAP and
(b) Capital Lease Obligations incurred by the Borrower and its Subsidiaries
during such period.

     "Capital Lease Obligations" of any Person means the obligations of such
      -------------------------
Person to pay rent or other amounts under any lease of (or other arrangement
conveying the right to use) real or personal property, or a combination thereof,
which obligations are required to be classified and accounted for as capital
leases on a balance sheet of such Person under GAAP, and the amount of such
obligations shall be the capitalized amount thereof determined in accordance
with GAAP.

     "Cash Interest Expense" means, for any period, the sum of (a) interest
      ---------------------
expense of the Borrower and the Subsidiary Loan Parties for such period,
determined on a consolidated basis in

CREDIT AGREEMENT - Page 3
<PAGE>

accordance with GAAP, excluding (to the extent otherwise included therein) (i)
amortization of debt discounts and loan fees, (ii) interest expense in respect
of any Indebtedness that constitutes a Primary Subordinated Obligation and (iii)
any other interest that is not required to be paid during such period or within
one year after the end of such period, plus (b) the aggregate amount of
Restricted Payments made during such period pursuant to clause (d) or (e) of
Section 6.06.
------------

     "Change in Control" means (a) the acquisition of ownership, directly or
      -----------------
indirectly, beneficially or of record, by any Person other than Holdings of any
Equity Interest in the Borrower, (b) the acquisition of ownership, directly or
indirectly, beneficially or of record, by any Person other than the Parent of
any Equity Interest in any License Subsidiary, (c) the sale, transfer or other
disposition by the Parent of any Equity Interest in Holdings, (d) the failure by
the Parent to own, beneficially and of record, Voting Stock of Holdings
representing at least 51% of the combined voting power of all Voting Stock of
Holdings, (e) the failure by the Parent to have the ability (without the consent
or approval of any other Person) to control the election of at least a majority
of the board of directors of Holdings, (f) the acquisition of beneficial
ownership (within the meaning of Rule 13d-3 of the Securities and Exchange
Commission under the Securities Exchange Act of 1934), directly or indirectly,
by any Person (or two or more Persons acting in concert), other than the Parent,
of Voting Stock of Holdings (or other securities convertible into such Voting
Stock) representing 15% or more of the combined voting power of all Voting Stock
of Holdings, (g) the acquisition of beneficial ownership (within the meaning of
such Rule 13d-3), directly or indirectly, by any Person (or two or more Persons
acting in concert) of Voting Stock of the Parent (or other securities
convertible into such Voting Stock) representing 20% or more of the combined
voting power of all Voting Stock of the Parent, (h) the failure on any day of at
least a majority of the board of directors of the Parent to be comprised of (i)
individuals who were directors of the Parent as of the later of the date 18
months prior to such day or September 1, 1999, and (ii) individuals whose
nomination as directors was approved by individuals who were directors of the
Parent as of the later of the date 18 months prior to such day or September 1,
1999, or (i) the acquisition, by contract or otherwise, of the power to
exercise, directly or indirectly, Control of the Parent by any Person (or two or
more Persons acting in concert), or the entering into of any contract or
arrangement that, upon consummation, will result in such acquisition of power.
For purposes of the foregoing, "Voting Stock" means Equity Interests issued by a
                                ------------
Person the holders of which are ordinarily, in the absence of contingencies,
entitled to vote for the election of directors (or persons performing similar
functions) of such Person, even if the right so to vote has been suspended by
the happening of such contingency.  The grant by the Parent of a Lien on any
Equity Interest in Holdings shall not constitute a Change in Control unless and
until any action is taken to exercise remedies in respect of such Lien.

     "Change in Law" means (a) the adoption of any law, rule or regulation after
      -------------
the date of this Agreement, (b) any change in any law, rule or regulation or in
the interpretation or application thereof by any Governmental Authority after
the date of this Agreement or (c) compliance by any Lender (or, for purposes of
Section 2.13(b), by any lending office of such Lender or by such Lender's
---------------
holding company, if any) with any request, guideline or directive (whether or
not having the force of law) of any Governmental Authority made or issued after
the date of this Agreement.

     "ChaseTel" means Chase Telecommunications, Inc., a Delaware corporation.
      --------

CREDIT AGREEMENT - Page 4
<PAGE>

     "ChaseTel Acquisition" means the purchase of ChaseTel, ChaseTel Licensee
      --------------------
and certain related assets pursuant to the ChaseTel Purchase Agreement.

     "ChaseTel Credit Agreement" means the Credit Agreement dated as of June 26,
      -------------------------
1998, as amended, between ChaseTel and QUALCOMM Incorporated.

     "ChaseTel Earnout" means (a) the obligation to pay the "Earnout Amount" (as
      ----------------                                       --------------
defined in the ChaseTel Purchase Agreement) or (b) any payment made in respect
of such obligation.

     "ChaseTel Indebtedness" means any Indebtedness of ChaseTel existing at the
      ---------------------
time of consummation of the ChaseTel Acquisition, including any Indebtedness
outstanding under the ChaseTel Credit Agreement.

     "ChaseTel Licensee" means ChaseTel Licensee Corp., a Delaware corporation.
      -----------------

     "ChaseTel Purchase Agreement" means the Asset Purchase Agreement dated as
      ---------------------------
of December 24, 1998, among the Parent, Chase Telecommunications Holdings, Inc.,
ChaseTel, Anthony Chase and Richard McDugald, as amended by the letter agreement
dated January 22, 1999, the letter agreement dated February 12, 1999, the letter
agreement dated February 19, 1999, the Third Amendment to Asset Purchase
Agreement dated November 15, 1999 and the letter agreement dated March 17, 2000
among the Parent, the Borrower and Chase Telecommunications Holdings, Inc.

     "Code" means the Internal Revenue Code of 1986, as amended from time to
      ----
time.

     "Collateral" means any and all "Collateral", as defined in any applicable
      ----------                     ----------
Security Document.

     "Collateral Agency Agreement" means the Amended and Restated Collateral
      ---------------------------
Agency and Intercreditor Agreement among the Borrower, Lucent, Nortel Networks,
the holders of Eligible Secured Debt (or their representatives) that become
parties thereto as provided therein and the Collateral Agent, in the form of
Exhibit B.
---------

     "Collateral Agent" means State Street Bank and Trust Company in its
      ----------------
capacity as collateral agent for the Secured Parties (as defined in the
Collateral Agency Agreement) under the Security Documents.

     "Collateral and Guarantee Requirement" means the requirement that:
      ------------------------------------

     (a) the Collateral Agent shall have received from the parties thereto a
fully executed Collateral Agency Agreement, from the Parent the Parent
Guarantee, and from Holdings and each Subsidiary Loan Party either (i) a
counterpart of the Guarantee Agreement duly executed and delivered on behalf of
such Subsidiary Loan Party or (ii) in the case of any Person that becomes a
Subsidiary Loan Party after the Effective Date, a supplement to the Guarantee
Agreement, in the form specified therein, duly executed and delivered on behalf
of such Subsidiary Loan Party;

CREDIT AGREEMENT - Page 5
<PAGE>

     (b) the Collateral Agent shall have received (i) from the Parent a
counterpart of the Parent Pledge Agreement duly executed and delivered on behalf
of the Parent, (ii) from Holdings, the Borrower and each of its Subsidiaries
either (A) a counterpart of the Borrower Pledge Agreement duly executed and
delivered on behalf of Holdings, the Borrower or such Subsidiary, as applicable,
or (B) in the case of any Person that becomes a Subsidiary after the Effective
Date, a supplement to the Borrower Pledge Agreement, in the form specified
therein, duly executed and delivered on behalf of such Subsidiary, and (iii)
from the Borrower and each Subsidiary Loan Party either (A) counterparts of each
of the Security Agreement and the Indemnity, Subrogation and Contribution
Agreement duly executed and delivered on behalf of the Borrower or such
Subsidiary Loan Party, as applicable, or (B) in the case of any Person that
becomes a Subsidiary Loan Party after the Effective Date, a supplement to each
such agreement, in the form specified therein, duly executed and delivered on
behalf of such Subsidiary Loan Party;

     (c) all outstanding Equity Interests of the Borrower and each Subsidiary
Loan Party owned by or on behalf of any Loan Party shall have been pledged
pursuant to the applicable Pledge Agreement and the Collateral Agent shall have
received certificates or other instruments representing all such Equity
Interests, together with stock powers or other instruments of transfer with
respect thereto endorsed in blank;

     (d) all Indebtedness of Holdings, the Borrower and each Subsidiary Loan
Party that is owing to any Loan Party (except for Indebtedness of Holdings that
is owing to the Parent) shall be evidenced by a promissory note and shall have
been pledged pursuant to the applicable Pledge Agreement and the Collateral
Agent shall have received all such promissory notes, together with instruments
of transfer with respect thereto endorsed in blank;

     (e) all documents and instruments, including Uniform Commercial Code
financing statements, required by law or reasonably requested by either Agent to
be filed, registered or recorded to create the Liens intended to be created by
the Security Documents, and to perfect such Liens to the extent required by, and
with the priority required by, the Security Documents, shall have been filed,
registered or recorded or delivered to the Collateral Agent for filing,
registration or recording;

     (f) the Collateral Agent shall have received (i) counterparts of a Mortgage
with respect to each Mortgaged Property duly executed and delivered by the
record owner of such Mortgaged Property, (ii) a policy or policies of title
insurance issued by a nationally recognized title insurance company insuring the
Lien of each such Mortgage as a valid first Lien on the Mortgaged Property
described therein, free of any other Liens except as expressly permitted by
Section 6.02, together with such endorsements, coinsurance and reinsurance as
------------
either Agent or the Required Lenders may reasonably request, and (iii) such
surveys, abstracts, appraisals, legal opinions and other documents as either
Agent or the Required Lenders may reasonably request with respect to any such
Mortgage or Mortgaged Property; and

     (g) each Loan Party shall have obtained all consents and approvals required
to be obtained by it in connection with the execution and delivery of the
Guarantee Agreement and all

CREDIT AGREEMENT - Page 6
<PAGE>

Security Documents to which it is a party, the performance of its obligations
thereunder and the granting by it of the Liens under such Security Documents.

     "Commitment" means, with respect to each Lender, the commitment, if any, of
      ----------
such Lender to make Loans hereunder during the Availability Period, expressed as
an amount representing the maximum principal amount of the Loans to be made by
such Lender hereunder, as such commitment may be (a) reduced from time to time
pursuant to Section 2.06 and (b) reduced or increased from time to time pursuant
            ------------
to assignments by or to such Lender pursuant to Section 9.04.  The initial
                                                ------------
amount of each Lender's Commitment is set forth on Schedule 2.01, or in the
                                                   -------------
Assignment and Acceptance pursuant to which such Lender shall have assumed its
Commitment, as applicable.  The initial aggregate amount of the Commitments is
$525,000,000.

     "Commitment Fee Rate" means a rate per annum equal to (a) 1.25% until the
      -------------------
aggregate principal amount of Loans made hereunder (whether or not repaid)
equals $175,000,000, (b) 1.00% thereafter, until the aggregate principal amount
of the Loans made hereunder (whether or not repaid) equals $350,000,000 and (c)
0.75% thereafter.

     "Consolidated EBITDA" means, for any period, Consolidated Net Income for
      -------------------
such period (adjusted to exclude all extraordinary items), plus, without
duplication and to the extent deducted from revenues in determining such
Consolidated Net Income, the sum of (a) consolidated interest expense for such
period, (b) consolidated income tax expense for such period, and (c) all amounts
attributable to depreciation and amortization for such period, all as determined
on a consolidated basis in accordance with GAAP.

     "Consolidated Net Income" means, for any period, the net income or loss of
      -----------------------
the Borrower and the Subsidiary Loan Parties for such period determined on a
consolidated basis in accordance with GAAP; provided that there shall be
excluded (a) the income of any Person (other than the Borrower or a Subsidiary
Loan Party) in which any other Person (other than the Borrower or any Subsidiary
or any director holding qualifying shares in compliance with applicable law)
owns an Equity Interest, except to the extent of the amount of dividends or
other distributions actually paid to the Borrower or any of the Subsidiaries
during such period, and (b) the income or loss of any Person accrued prior to
the date it becomes a Subsidiary Loan Party or is merged into or consolidated
with the Borrower or any Subsidiary Loan Party or the date that such Person's
assets are acquired by the Borrower or any Subsidiary Loan Party.

     "Control" means the possession, directly or indirectly, of the power to
      -------
direct or cause the direction of the management or policies of a Person, whether
through the ability to exercise voting power, by contract or otherwise.
"Controlling" and "Controlled" have meanings correlative thereto.
 -----------       ----------

     "Covered POPS" means, at any time, the aggregate number of POPS within the
      ------------
service areas of the facilities that are then owned by the Borrower and its
Subsidiaries and that have been placed in commercial operation.

     "Credit Facility Obligations" means (a) the principal of and premium, if
      ---------------------------
any, and interest (including interest accruing during the pendency of any
bankruptcy, insolvency, receivership or other

CREDIT AGREEMENT - Page 7
<PAGE>

similar proceeding, regardless of whether allowed or allowable in such
proceeding) on the Loans, when and as due, whether at maturity, by acceleration,
upon one or more dates set for prepayment or otherwise and (b) all other
monetary obligations, including fees, costs, expenses and indemnities, whether
primary, secondary, direct, contingent, fixed or otherwise (including monetary
obligations incurred during the pendency of any bankruptcy, insolvency,
receivership or other similar proceeding, regardless of whether allowed or
allowable in such proceeding) of the Borrower under this Agreement or any other
Loan Document.

     "Default" means any event or condition which constitutes an Event of
      -------
Default or which upon notice, lapse of time or both would, unless cured or
waived, become an Event of Default.

     "Disclosed Matters" means the actions, suits and proceedings and the
      -----------------
environmental matters disclosed in Schedule 3.06.
                                   -------------

     "Disqualified Stock" means any capital stock of Holdings, the Borrower or
      ------------------
any Subsidiary which by its terms (or by the terms of any security into which it
is convertible or for which it is exchangeable or exercisable) or upon the
happening of any event (a) matures or is mandatorily redeemable pursuant to a
sinking fund obligation or otherwise, (b) is convertible or exchangeable for
Indebtedness or Disqualified Stock, (c) requires the payment of dividends other
than dividends payable solely in additional shares of capital stock of Holdings
(other than Disqualified Stock) or (d) is redeemable or subject to required
repurchase at the option of the holder thereof, in whole or in part.

     "dollars" or "$" refers to lawful money of the United States of America.
      -------      -

     "Effective Date" means the date, on or after the date of this Agreement, on
      --------------
which the conditions specified in Section 4.01 are satisfied (or waived in
                                  ------------
accordance with Section 9.02).
                ------------

     "Eligible Assignee" means (a) Nortel Networks or any Affiliate of Nortel
      -----------------
Networks, (b) any commercial bank or other financial institution (including any
credit corporation), in each case that either (i) has total assets in excess of
$10,000,000,000, (ii) has a combined capital and surplus and undivided profits
in excess of $700,000,000, (iii) has long-term indebtedness rated BBB- or better
by S&P or Baa3 or better by Moody's, or commercial paper having one of the two
highest credit ratings obtainable from S&P or Moody's, or (iv) has an Affiliate
that satisfies any of the criteria described in the foregoing clauses (i), (ii)
                                                              -----------  ----
and (iii), or (c) any fund that is regularly engaged in making, purchasing or
    -----
investing in loans or securities that is controlled by an institution described
in clause (b) above or by any other nationally recognized investment fund
   ----------
manager.

     "Eligible Parent Debt" means Indebtedness of the Parent in respect of debt
      --------------------
securities issued in an underwritten public offering or private placement
pursuant to Rule 144A; provided that (a) such Indebtedness shall not mature, nor
                       --------
shall any scheduled repayment of any principal thereof be due, nor shall such
Indebtedness be subject to any mandatory redemption or required repurchase,
conversion or exchange (whether upon the occurrence of any contingency or
otherwise, but excluding contingent redemption offer provisions in the event of
a "change of control" or "asset sale"

CREDIT AGREEMENT - Page 8
<PAGE>

that are customary for similar debt securities), in each case prior to the date
that is one year after the Maturity Date, (b)

CREDIT AGREEMENT - Page 9

<PAGE>

any covenants, events of default and similar provisions relating thereto shall
be reasonably satisfactory to the Required Lenders, (c) the obligations of the
Parent in respect thereof shall not be Guaranteed by any Loan Party (except for
Holdings) or secured by any Lien (except for a Lien on the collateral account
established to fund interest payments as provided in clause (d) below), (d) by
                                                     ----------
its terms, no interest shall be payable in respect of such Indebtedness (other
than (i) by the issuance of additional Eligible Parent Debt or (ii) out of a
cash reserve funded by the Parent from the net proceeds of the issuance of such
Indebtedness in an amount sufficient to pay such cash interest) prior to October
1, 2003 and (e) the net proceeds of such Indebtedness (other than the portion,
if any, of such net proceeds (i) applied to fund any collateral account
established to fund interest payments as provided above or (ii) not exceeding
[*] to be used to purchase FCC Licenses (either directly as an asset purchase or
as a portion of the consideration for the acquisition of an entity that owns an
FCC License, such portion not to exceed the value of such FCC License) which are
contributed to a License Subsidiary prior to September 30, 2000, provided that
                                                                 --------
all proceeds described in this clause (ii) shall be held in an interest-bearing
                               -----------
account until so used and, to the extent such proceeds and the accrued interest
thereon are not used to purchase FCC Licenses prior to September 30, 2000, such
unused proceeds and accrued interest shall be contributed to the Borrower as
common equity on September 30, 2000) are contributed by the Parent to Holdings
as common equity or are used to repay, in an amount not to exceed $51,000,000, a
promissory note issued by the Parent to Holdings as consideration for the
purchase price of equity in Holdings and then, in each case, contributed by
Holdings to the Borrower as common equity.

     "Eligible Secured Debt" means, without duplication, (a) Indebtedness of the
      ---------------------
Borrower in respect of the Loans, (b) any other Indebtedness for borrowed money
of the Borrower incurred to finance the purchase price of (i) equipment
purchased by the Borrower and its Subsidiaries (other than pursuant to the
Purchase Agreement) for use in their wireless telecommunications and data
networking business and/or (ii) services purchased by the Borrower and its
Subsidiaries (other than pursuant to the Purchase Agreement) related to the
design, construction or installation of their wireless telecommunications and
data networks that incorporate equipment referred to in clause (i) above
                                                        ----------
(including site acquisition services), (c) any other Indebtedness for borrowed
money of the Borrower incurred to finance payments in respect of fees related to
or interest in respect of Eligible Secured Debt (other than the Loans) or the
purchase price of any FCC License that is acquired by a License Subsidiary and
is to be used in the business of the Borrower and its Subsidiaries after the
purchase thereof (provided that such FCC License is acquired by a License
Subsidiary free of any Liens and is not purchased subject to any FCC Debt,
Permitted License Acquisition Debt or other Indebtedness), and (d) any
Indebtedness for borrowed money of the Borrower incurred to refinance
Indebtedness referred to in clause (a), (b) or (c) above in compliance with the
                            ----------  ---    ---
proviso to clause (f) of Section 6.01 (other than clause (v) of such proviso);
           ----------    ------------             ----------
provided that:
--------

          (i) in the case of any Indebtedness described in clause (b) above, (A)
                                                           ----------
     such Indebtedness is incurred, for equipment, within six months after the
     later of the acquisition, the completion of construction and final
     acceptance or the commencement of full operation of the relevant equipment,
     and, for services, within six months of the completion thereof, (B) the
     principal amount thereof does not exceed 100% of the purchase price of the
     equipment or services (as applicable) financed thereby and (C) such
     equipment becomes

CREDIT AGREEMENT - Page 10

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

     Collateral under the Security Agreement upon the purchase thereof (free of
     any Liens other than the Lien of the Security Agreement);

          (ii)   in the case of any Indebtedness described in clause (c) above,
                                                              ----------
     at the time of and after giving effect to the incurrence of any such
     Indebtedness the aggregate principal amount of all Indebtedness described
     in clause (c) above that has been incurred (on a cumulative basis, whether
        ----------
     or not such Indebtedness remains outstanding) shall not exceed the sum of
     (A) 50% of the aggregate principal amount of all Indebtedness described in
     clause (b) above that has been incurred (on a cumulative basis, whether or
     ----------
     not such Indebtedness remains outstanding) at or prior to such time plus
     (B) $100,000,000; provided that Indebtedness incurred in reliance upon
                       --------
     clause (B) shall not be incurred to finance fees related to Eligible
     ----------
     Secured Debt;

          (iii)  in the case of any Indebtedness described in clause (b) or (c)
                                                              ----------    ---
     above, at the time of and after giving effect to the incurrence of any such
     Indebtedness the aggregate principal amount of all such Indebtedness that
     has been incurred and all Loans that have been incurred (in each case, on a
     cumulative basis, whether or not such Indebtedness or Loans remain
     outstanding) shall not exceed $1,845,000,000;

          (iv)   in the case of any Indebtedness described in clause (b), (c) or
                                                              ----------  ---
     (d) above, the holder or holders of such Indebtedness (or a duly authorized
     ---
     representative thereof on behalf of such holders) shall have become a party
     to the Collateral Agency Agreement as provided therein;

          (v)    in the case of any Indebtedness described in clause (b), (c) or
                                                              ----------  ---
     (d) above, such Indebtedness is not Guaranteed by any Person (other than
     ---
     (A) pursuant to the Guarantee Agreement or (B) Guarantees that also
     Guarantee the Credit Facility Obligations (as defined in the Collateral
     Agency Agreement) equally and ratably) or secured by any Lien (other than
     Liens granted to the Collateral Agent to secure all Eligible Secured Debt
     pursuant to the Security Documents); and

          (vi)   in the case of any Indebtedness described in clause (b), (c) or
                                                              ----------  ---
     (d) above, (A) the terms and conditions of such Indebtedness shall not be
     ---
     less favorable to the Borrower in any material respect than the terms and
     conditions of the Loans and shall not be inconsistent with the terms and
     conditions of the Loans, and (B) at the time of and after giving effect to
     the incurrence of any such Indebtedness, no Default shall have occurred and
     be continuing and the Borrower shall be in compliance with Sections 6.19
                                                                -------------
     and 6.20 determined on a pro forma basis as of the last day of the most
         ----
     recently ended calendar quarter of the Borrower for which financial
     statements are available as though such Indebtedness had been incurred on
     such day.

     "Environmental Laws" means all laws, rules, regulations, codes, ordinances,
      ------------------
orders, decrees, judgments, injunctions, notices or binding agreements issued,
promulgated or entered into by any Governmental Authority, relating in any way
to the environment, preservation or reclamation of natural resources, the
management, release or threatened release of any Hazardous Material or to health
and safety matters.

CREDIT AGREEMENT - Page 11
<PAGE>

     "Environmental Liability" means any liability, contingent or otherwise
      -----------------------
(including any liability for damages, costs of environmental remediation, fines,
penalties or indemnities), of any Loan Party directly or indirectly resulting
from or based upon (a) violation of any Environmental Law, (b) the generation,
use, handling, transportation, storage, treatment or disposal of any Hazardous
Materials, (c) exposure to any Hazardous Materials, (d) the release or
threatened release of any Hazardous Materials into the environment or (e) any
contract, agreement or other consensual arrangement pursuant to which liability
is assumed or imposed with respect to any of the foregoing.

     "Equipment Site Interest" means any ownership interest in, or right, title
      -----------------------
or interest under any lease, agreement or other arrangement providing for the
right to use, any site upon or at which any infrastructure equipment owned by
the Borrower or any Subsidiary is or is to be located.

     "Equity Interests" means shares of capital stock, partnership interests,
      ----------------
membership interests in a limited liability company, beneficial interests in a
trust or other equity ownership interests in a Person.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
      -----
amended from time to time.

     "ERISA Affiliate" means any trade or business (whether or not incorporated)
      ---------------
that, together with the Borrower, is treated as a single employer under Section
414(b) or (c) of the Code or, solely for purposes of Section 302 of ERISA and
Section 412 of the Code, is treated as a single employer under Section 414 of
the Code.

     "ERISA Event" means (a) any "reportable event", as defined in Section 4043
      -----------                 ----------------
of ERISA or the regulations issued thereunder with respect to a Plan (other than
an event for which the 30-day notice period is waived), (b) the existence with
respect to any Plan of an "accumulated funding deficiency" (as defined in
Section 412 of the Code or Section 302 of ERISA), whether or not waived, (c) the
filing pursuant to Section 412(d) of the Code or Section 303(d) of ERISA of an
application for a waiver of the minimum funding standard with respect to any
Plan, (d) the incurrence by the Borrower or any of its ERISA Affiliates of any
liability under Title IV of ERISA with respect to the termination of any Plan,
(e) the receipt by the Borrower or any ERISA Affiliate from the PBGC or a plan
administrator of any notice relating to an intention to terminate any Plan or
Plans or to appoint a trustee to administer any Plan, (f) the incurrence by the
Borrower or any of its ERISA Affiliates of any liability with respect to the
withdrawal or partial withdrawal from any Plan or Multiemployer Plan, or (g) the
receipt by the Borrower or any ERISA Affiliate of any notice, or the receipt by
any Multiemployer Plan from the Borrower or any ERISA Affiliate of any notice,
concerning the imposition of Withdrawal Liability or a determination that a
Multiemployer Plan is, or is expected to be, insolvent or in reorganization,
within the meaning of Title IV of ERISA.

     "Event of Default" has the meaning assigned to such term in Article VII.
      ----------------                                           -----------

     "Excess Cash Flow" means, for any fiscal year of the Borrower, the sum
      ----------------
(without duplication) of:

CREDIT AGREEMENT - Page 12
<PAGE>

     (a) the Consolidated Net Income of the Borrower and the Subsidiary Loan
Parties for such fiscal year, adjusted to exclude any gains or losses
attributable to Prepayment Events; plus

     (b) depreciation, amortization and other non-cash charges or losses
deducted in determining such Consolidated Net Income for such fiscal year; plus

     (c) the sum of (i) the amount, if any, by which Net Working Capital
decreased during such fiscal year plus (ii) the net amount, if any, by which the
                                  ----
consolidated deferred revenues of the Borrower and the Subsidiary Loan Parties
increased during such fiscal year; minus
                                   -----

     (d) the sum of (i) any non-cash gains included in determining such
consolidated net income (or loss) for such fiscal year plus (ii) the amount, if
                                                       ----
any, by which Net Working Capital increased during such fiscal year plus (iii)
                                                                    ----
the net amount, if any, by which the consolidated deferred revenues of the
Borrower and the Subsidiary Loan Parties decreased during such fiscal year;
minus
-----

     (e) Capital Expenditures for such fiscal year (except to the extent
attributable to the incurrence of Capital Lease Obligations or otherwise
financed by incurring Long-Term Indebtedness); minus
                                               -----

     (f) the aggregate principal amount of Long-Term Indebtedness repaid or
prepaid by the Borrower and the Subsidiary Loan Parties during such fiscal year,
excluding (i) Eligible Secured Debt prepaid pursuant to Section 2.09(c) or (d),
                                                        ---------------    ---
and (ii) repayments or prepayments of Long-Term Indebtedness financed by
incurring other Long-Term Indebtedness; minus
                                        -----

     (g) the aggregate amount of Restricted Payments made during such fiscal
year pursuant to clauses (d) or (e) of Section 6.06.
                 -----------    ---    ------------

     "Excluded Taxes" means, with respect to either Agent, any Lender or any
      --------------
other recipient of any payment to be made by or on account of any obligation of
the Borrower hereunder, (a) income or franchise taxes imposed on (or measured
by) its net income by the United States of America, or by the jurisdiction under
the laws of which such recipient is organized or in which its principal office
is located or, in the case of any Lender, in which its applicable lending office
is located, (b) any branch profits taxes imposed by the United States of America
or any similar tax imposed by any other jurisdiction described in clause (a)
above and (c) in the case of a Foreign Lender (other than an assignee pursuant
to a request by the Borrower under Section 2.17(b)), any withholding tax that
                                   ---------------
(i) is in effect and would apply to amounts payable to such Foreign Lender at
the time such Foreign Lender becomes a party to this Agreement (or designates a
new lending office), except to the extent that such Foreign Lender (or its
assignor, if any) was entitled, at the time of designation of a new lending
office (or assignment), to receive additional amounts from the Borrower with
respect to any withholding tax pursuant to Section 2.15(a) or (ii) is
                                           ---------------
attributable to such Foreign Lender's failure to comply with Section 2.15(a).
                                                             ---------------

     "FCC" means the Federal Communications Commission.
      ---

CREDIT AGREEMENT - Page 13
<PAGE>

     "FCC Debt" means Indebtedness owing to the FCC in respect of the deferred
      --------
purchase price of any FCC License.

     "FCC License" means any license granted by the FCC to the Borrower or any
      -----------
Subsidiary Loan Party or that is used by the Borrower or any Subsidiary in the
conduct of its business.

     "Federal Funds Effective Rate" means, for any day, the weighted average
      ----------------------------
(rounded upwards, if necessary, to the next 1/100 of 1%) of the rates on
overnight Federal funds transactions with members of the Federal Reserve System
arranged by Federal funds brokers, as published on the next succeeding Business
Day by the Federal Reserve Bank of New York, or, if such rate is not so
published for any day that is a Business Day, the average (rounded upwards, if
necessary, to the next 1/100 of 1%) of the quotations for such day for such
transactions received by the Administrative Agent from three Federal funds
brokers of recognized standing selected by it.

     "Financial Officer" means the chief financial officer, principal accounting
      -----------------
officer, treasurer or controller of the Borrower.

     "Fixed Charges" means, as of any date, the sum of (a) Cash Interest
      -------------
Expense, (b) Capital Expenditures and (c) scheduled principal payments of
Indebtedness to be made by the Borrower or any Subsidiary Loan Party to any
Person other than the Borrower or any Subsidiary Loan Party, in each case
projected (to the extent necessary) for the period of four consecutive fiscal
quarters of the Borrower beginning on such date or, if such date is not the
first day of a fiscal quarter of the Borrower, beginning on the last day of the
fiscal quarter of the Borrower most recently ended on such date.

     "Foreign Lender" means any Lender that is organized under the laws of a
      --------------
jurisdiction other than the United States of America, any State thereof or the
District of Columbia.

     "GAAP" means generally accepted accounting principles in the United States
      ----
of America.

     "Governmental Authority" means the government of the United States of
      ----------------------
America, any other nation or any political subdivision thereof, whether state or
local, and any agency, authority, instrumentality, regulatory body, court,
central bank or other entity exercising executive, legislative, judicial,
taxing, regulatory or administrative powers or functions of or pertaining to
government.

     "Guarantee" of or by any Person (the "guarantor") means any obligation,
      ---------                            ---------
contingent or otherwise, of the guarantor guaranteeing or having the economic
effect of guaranteeing any Indebtedness or other obligation of any other Person
(the "primary obligor") in any manner, whether directly or indirectly, and
      ---------------
including any obligation of the guarantor, direct or indirect, (a) to purchase
or pay (or advance or supply funds for the purchase or payment of) such
Indebtedness or other obligation or to purchase (or to advance or supply funds
for the purchase of) any security for the payment thereof, (b) to purchase or
lease property, securities or services for the purpose of assuring the owner of
such Indebtedness or other obligation of the payment thereof, (c) to maintain
working capital, equity capital or any other financial statement condition or
liquidity of the primary obligor so as to enable the primary obligor to pay such
Indebtedness or other obligation or (d) as an account

CREDIT AGREEMENT - Page 14
<PAGE>

party in respect of any letter of credit or letter of guaranty issued to support
such Indebtedness or obligation; provided, that the term Guarantee shall not
                                 --------
include endorsements for collection or deposit in the ordinary course of
business.

     "Guarantee Agreement" means the Guarantee Agreement dated as of November
      -------------------
24, 1999, among Holdings, the Subsidiary Loan Parties and the Collateral Agent,
as supplemented by Supplement No. 1 dated as of March 20, 2000, Supplement No. 2
dated as of March 20, 2000, Supplement No. 3 dated as of March 20, 2000,
Supplement No. 4 dated as of April 28, 2000, Supplement No. 5 dated as of April
28, 2000, Supplement No. 6 dated as of April 28, 2000, Supplement No. 7 dated as
of April 28, 2000, Supplement No. 8 dated as of April 28, 2000, Supplement No. 9
dated as of April 28, 2000, Supplement No. 10 dated as of April 28, 2000,
Supplement No. 11 dated as of April 28, 2000, Supplement No. 12 dated as of
April 28, 2000, Supplement No. 13 dated as of April 28, 2000, and Supplement No.
14 dated as of April 28, 2000, true and correct photocopies of which have been
delivered to the Administrative Agent.

     "Hazardous Materials" means all explosive or radioactive substances or
      -------------------
wastes and all hazardous or toxic substances, wastes or other pollutants,
including petroleum or petroleum distillates, asbestos or asbestos containing
materials, polychlorinated biphenyls, radon gas, infectious or medical wastes
and all other substances or wastes of any nature regulated pursuant to any
Environmental Law.

     "Hedging Agreement" means any interest rate protection agreement, foreign
      -----------------
currency exchange agreement, commodity price protection agreement or other
interest or currency exchange rate or commodity price hedging arrangement.

     "Holdings" means Cricket Communications Holdings, Inc., a Delaware
      --------
corporation.

     "Indebtedness" of any Person means, without duplication, (a) all
      ------------
obligations of such Person for borrowed money or with respect to deposits or
advances of any kind, (b) all obligations of such Person evidenced by bonds,
debentures, notes or similar instruments, (c) all obligations of such Person
upon which interest charges are customarily paid, (d) all obligations of such
Person under conditional sale or other title retention agreements relating to
property acquired by such Person, (e) all obligations of such Person in respect
of the deferred purchase price of property or services (excluding current
accounts payable incurred in the ordinary course of business), (f) all
Indebtedness of others secured by (or for which the holder of such Indebtedness
has an existing right, contingent or otherwise, to be secured by) any Lien on
property owned or acquired by such Person, whether or not the Indebtedness
secured thereby has been assumed, (g) all Guarantees by such Person of
Indebtedness of others, (h) all Capital Lease Obligations of such Person, (i)
all obligations, contingent or otherwise, of such Person as an account party in
respect of letters of credit and letters of guaranty, (j) all obligations,
contingent or otherwise, of such Person in respect of bankers' acceptances and
(k) all Disqualified Stock of such Person.  The Indebtedness of any Person shall
include the Indebtedness of any other entity (including any partnership in which
such Person is a general partner) to the extent such Person is liable therefor
as a result of such Person's ownership interest in or other relationship with
such entity, except to the extent the terms of such Indebtedness provide that
such Person is not liable therefor.

CREDIT AGREEMENT - Page 15
<PAGE>

     "Indemnified Taxes" means Taxes other than Excluded Taxes.
      -----------------

     "Indemnity, Subrogation and Contribution Agreement" means the Indemnity,
      -------------------------------------------------
Subrogation and Contribution Agreement dated as of November 24, 1999, among the
Borrower, the Subsidiary Loan Parties and the Collateral Agent, as supplemented
by Supplement No. 1 dated as of March 20, 2000, Supplement No. 2 dated as of
March 20, 2000, Supplement No. 3 dated as of March 20, 2000, Supplement No. 4
dated as of April 28, 2000, Supplement No. 5 dated as of April 28, 2000,
Supplement No. 6 dated as of April 28, 2000, Supplement No. 7 dated as of April
28, 2000, Supplement No. 8 dated as of April 28, 2000, Supplement No. 9 dated as
of April 28, 2000, Supplement No. 10 dated as of April 28, 2000, Supplement No.
11 dated as of April 28, 2000, Supplement No. 12 dated as of April 28, 2000,
Supplement No. 13 dated as of April 28, 2000, and Supplement No. 14 dated as of
April 28, 2000, true and correct photocopies of which have been delivered to the
Administrative Agent, as amended by an amendment thereto in the form of the
amendment attached hereto as Exhibit C.
                             ---------

     "Initial Availability Date" means the first date after the Effective Date
      -------------------------
on which the conditions set forth in Section 4.02 are satisfied (or waived in
                                     ------------
accordance with Section 9.02).
                ------------

     "Intercompany Agreements" has the meaning set forth in Section 5.15.
      -----------------------                               ------------

     "Interest Borrowing" means any Borrowing of Loans hereunder for the sole
      ------------------
purpose of paying, and the proceeds of which are applied solely to pay, accrued
interest on any Loans or accrued commitment fees payable under this Agreement.

     "Interest Election Request" means a request by the Borrower to convert or
      -------------------------
continue a Borrowing in accordance with Section 2.05.
                                        ------------

     "Interest Payment Date" means (a) with respect to any ABR Loan, the last
      ---------------------
day of each March, June, September and December and (b) with respect to any
LIBOR Loan, the last day of the Interest Period applicable to the Borrowing of
which such Loan is a part and, in the case of a LIBOR Borrowing with an Interest
Period of more than three months' duration, each day prior to the last day of
such Interest Period that occurs at intervals of three months' duration after
the first day of such Interest Period.

     "Interest Period" means, with respect to any LIBOR Borrowing, the period
      ---------------
commencing on the date of such Borrowing and ending on the numerically
corresponding day in the calendar month that is one, two, three or six months
thereafter, as the Borrower may elect; provided, that (a) if any Interest Period
would end on a day other than a Business Day, such Interest Period shall be
extended to the next succeeding Business Day unless such next succeeding
Business Day would fall in the next calendar month, in which case such Interest
Period shall end on the next preceding Business Day and (b) any Interest Period
that commences on the last Business Day of a calendar month (or on a day for
which there is no numerically corresponding day in the last calendar month of
such Interest Period) shall end on the last Business Day of the last calendar
month of such Interest Period. For purposes hereof, the date of a Borrowing
initially shall be the date on which such Borrowing is

CREDIT AGREEMENT - Page 16
<PAGE>

made and thereafter shall be the effective date of the most recent conversion or
continuation of such Borrowing.

     "July 1999 FCC Order" means that certain Memorandum Opinion and Order No.
      -------------------
DA 99-1440 adopted and released by the FCC on July 22, 1999.

     "Lenders" means the Persons listed on Schedule 2.01 and any other Person
      -------                              -------------
that shall have become a party hereto pursuant to an Assignment and Acceptance,
other than any such Person that ceases to be a party hereto pursuant to an
Assignment and Acceptance.

     "Leverage Ratio" means, on any date, the ratio of (a) Total Indebtedness as
      --------------
of such date to (b) Consolidated EBITDA for the period of four consecutive
fiscal quarters of the Borrower ended on such date or, if such date is not the
last day of a fiscal quarter, ended on the last day of the fiscal quarter of the
Borrower most recently ended prior to such date.

     "LIBOR", when used in reference to any Loan or Borrowing, refers to the
      -----
fact that such Loan, or the Loans comprising such Borrowing, are bearing
interest at a rate determined by reference to the Adjusted LIBO Rate.

     "LIBO Rate" means, with respect to any LIBOR Borrowing for any Interest
      ---------
Period, the rate appearing on Page 3750 of the Telerate Service (or on any
successor or substitute page of such Service, or any successor to or substitute
for such Service, providing rate quotations comparable to those currently
provided on such page of such Service, as determined by the Administrative Agent
from time to time for purposes of providing quotations of interest rates
applicable to dollar deposits in the London interbank market) at approximately
11:00 a.m., London time, two Business Days prior to the commencement of such
Interest Period, as the rate for dollar deposits with a maturity comparable to
such Interest Period.  In the event that such rate is not available at such time
for any reason, then the "LIBO Rate" with respect to such LIBOR Borrowing for
                          ---------
such Interest Period shall be the rate at which dollar deposits of $5,000,000
and for a maturity comparable to such Interest Period are offered by the
principal London office of the Administrative Agent (or, if the Administrative
Agent at the time is not a commercial bank, any commercial bank based in New
York City selected by the Administrative Agent for the purpose of quoting such
rate, provided that such commercial bank has a combined capital and surplus and
undivided profits of not less than $500,000,000) in immediately available funds
in the London interbank market at approximately 11:00 a.m., London time, two
Business Days prior to the commencement of such Interest Period.

     "License Subsidiary" has the meaning assigned to such term in Section 6.13.
      ------------------                                           ------------

     "Lien" means, with respect to any asset, (a) any mortgage, deed of trust,
      ----
lien, pledge, hypothecation, encumbrance, charge or security interest in, on or
of such asset, (b) the interest of a vendor or a lessor under any conditional
sale agreement, capital lease or title retention agreement (or any financing
lease having substantially the same economic effect as any of the foregoing)
relating to such asset and (c) in the case of securities, any purchase option,
call or similar right of a third party with respect to such securities.

CREDIT AGREEMENT - Page 17
<PAGE>

     "Loan Documents" means this Agreement, any promissory note issued in
      --------------
connection with the Loans, the Collateral Agency Agreement, the Guarantee
Agreement, the Parent Agreement, the Parent Guarantee, the Subordination
Agreement, the Security Documents and the Indemnity, Subrogation and
Contribution Agreement and all other agreements, documents, instruments or
certificates executed and/or delivered by any Loan Party in connection herewith
or therewith (other than purchase agreements and supply agreements and
agreements, documents, instruments and certificates executed and/or delivered
pursuant thereto).

     "Loan Parties" means the Parent, Holdings, the Borrower and the Subsidiary
      ------------
Loan Parties.

     "Loans" means loans made to the Borrower pursuant to this Agreement.
      -----

     "Long-Term Indebtedness" means any Indebtedness that, in accordance with
      ----------------------
GAAP, constitutes (or, when incurred, constituted) a long-term liability.

     "Lucent" means Lucent Technologies Inc.
      ------

     "Lucent Credit Agreement" means that certain Credit Agreement dated as of
      -----------------------
September 20, 1999, among Holdings, the Borrower, the lenders party thereto and
Lucent Technologies, Inc., as amended from time to time.

     "Lucent Loan Indebtedness" means the Indebtedness of the Borrower under the
      ------------------------
Lucent Credit Agreement.

     "Material Adverse Effect" means a material adverse effect on (a) the
      -----------------------
business, assets, operations, prospects or condition (financial or otherwise) of
the Borrower and the Subsidiary Loan Parties taken as a whole, (b) the ability
of any Loan Party to perform any of its obligations under any Loan Document or
(c) the rights or remedies of, or benefits available to, the Administrative
Agent, the Collateral Agent or the Lenders under any Loan Document.

     "Material Indebtedness" means (a) Indebtedness (other than the Loans), or
      ---------------------
obligations in respect of one or more Hedging Agreements, of any one or more of
the Loan Parties in an aggregate principal amount exceeding $5,000,000, (b) any
FCC Debt or (c) any Permitted License Acquisition Debt. For purposes of
determining Material Indebtedness, the "principal amount" of the obligations of
a Loan Party in respect of any Hedging Agreement at any time shall be the
maximum aggregate amount (giving effect to any netting agreements) that such
Loan Party would be required to pay if such Hedging Agreement were terminated at
such time.

     "Maturity Date" means September 30, 2008.
      -------------

     "Moody's" means Moody's Investors Service, Inc.
      -------

     "Mortgage" means a mortgage, deed of trust, assignment of leases and rents,
      --------
leasehold mortgage or other security document granting a Lien on any Mortgaged
Property to secure the Obligations.  Each Mortgage shall be satisfactory in form
and substance to the Agents.

CREDIT AGREEMENT - Page 18
<PAGE>

     "Mortgaged Property" means each parcel of real property and improvements
      ------------------
thereto with respect to which a Mortgage is granted pursuant to Section 5.12.
                                                                ------------

     "Multiemployer Plan" means a multiemployer plan as defined in Section
      ------------------
4001(a)(3) of ERISA.

     "Net Proceeds" means, with respect to any event (a) the cash proceeds
      ------------
received in respect of such event including (i) any cash received in respect of
any non-cash proceeds, but only as and when received, (ii) in the case of a
casualty, insurance proceeds, and (iii) in the case of a condemnation or similar
event, condemnation awards and similar payments, net of (b) the sum of (i) all
fees and out-of-pocket expenses paid by the Borrower and the Subsidiary Loan
Parties to third parties (other than Affiliates of the Borrower) in connection
with such event, (ii) in the case of a sale or other disposition of an asset
(including pursuant to a sale and leaseback transaction or a casualty or
condemnation), the amount of all payments required to be made by the Borrower
and the Subsidiary Loan Parties as a result of such event to repay Indebtedness
(other than Eligible Secured Debt) secured by such asset or otherwise subject to
mandatory prepayment as a result of such event, and (iii) the amount of all
taxes paid (or reasonably estimated to be payable) by the Borrower and the
Subsidiary Loan Parties, and the amount of any reserves established by the
Borrower and the Subsidiary Loan Parties to fund contingent liabilities
reasonably estimated to be payable, in each case during the year that such event
occurred or the next succeeding year and that are directly attributable to such
event (as determined reasonably and in good faith by the chief financial officer
of the Borrower).

     "Net Working Capital" means, at any date, (a) the sum of the consolidated
      -------------------
current assets and non-current deferred income tax assets of the Borrower and
the Subsidiary Loan Parties as of such date (excluding cash and Permitted
Investments) minus (b) the sum of the consolidated current liabilities and non-
             -----
current deferred income tax liabilities of the Borrower and the Subsidiary Loan
Parties as of such date (excluding current liabilities in respect of
Indebtedness), determined on a consolidated basis in accordance with GAAP.  Net
Working Capital at any date may be a positive or negative number. Net Working
Capital increases when it becomes more positive or less negative and decreases
when it becomes less positive or more negative.

     "Nortel Networks" means Nortel Networks Inc.
      ---------------

     "Nortel Networks Lenders" means, at any time, Nortel Networks and any
      -----------------------
Affiliates of Nortel Networks that are Lenders at such time.

     "Obligations" has the meaning assigned to such term in the Collateral
      -----------
Agency Agreement.

     "Other Loan Documents" has the meaning assigned to such term in Section
      --------------------                                           -------
3.18.
----

     "Other Taxes" means any and all present or future stamp or documentary
      -----------
taxes or any other excise or property taxes, charges or similar levies arising
from any payment made under any Loan Document or from the execution, delivery or
enforcement of, or otherwise with respect to, any Loan Document.

CREDIT AGREEMENT - Page 19
<PAGE>

     "PBGC" means the Pension Benefit Guaranty Corporation referred to and
      ----
defined in ERISA and any successor entity performing similar functions.

     "Parent" means Leap Wireless International, Inc., a Delaware corporation.
      ------

     "Parent Agreement" means the Parent Agreement dated as of August 28, 2000
      ----------------
between Parent and the Administrative Agent in the form of Exhibit D.
                                                           ---------

     "Parent Guarantee" means the Guarantee Agreement dated as of August 28,
      ----------------
2000, executed by the Parent in favor of the Collateral Agent in the form of
Exhibit E.
---------

     "Parent Indenture" means the Indenture dated as of February 23, 2000, among
      ----------------
the Parent, as issuer, Holdings, as guarantor, and State Street Bank and Trust
Company, as trustee.

     "Parent Pledge Agreement" means the Parent Pledge Agreement dated as of
      -----------------------
November 24, 1999, between the Parent and the Collateral Agent, a true and
correct copy of which has been delivered to the Administrative Agent.

     "Payment Date" means each March 31, June 30, September 30 and December 31,
      ------------
commencing on and including the first such date that is on or after the
Availability Termination Date, and ending on and including the Maturity Date.

     "Perfection Certificate" means a certificate in the form of Exhibit F or
      ----------------------                                     ---------
any other form approved by the Agents.

     "Permitted Encumbrances" means:
      ----------------------

     (a)   Liens imposed by law for taxes that are not yet due or are being
contested in compliance with Section 5.05;
                             ------------

     (b)   carriers', warehousemen's, mechanics', landlords', materialmen's,
repairmen's and other like Liens imposed by law, arising in the ordinary course
of business and securing obligations that are not overdue by more than 30 days
or are being contested in compliance with Section 5.05;
                                          ------------

     (c)   pledges and deposits made in the ordinary course of business in
compliance with workers' compensation, unemployment insurance and other social
security laws or regulations;

     (d)   deposits to secure the performance of bids, trade contracts, leases,
statutory obligations, surety and appeal bonds, performance bonds and other
obligations of a like nature, in each case in the ordinary course of business;

     (e)   judgment liens in respect of judgments that do not constitute an
Event of Default under clause (k) of Article VII; and
                       ----------    -----------

     (f)   easements, zoning restrictions, rights-of-way and similar
encumbrances on real property imposed by law or arising in the ordinary course
of business that do not secure any monetary obligations and do not materially
detract from the value of the affected property or

CREDIT AGREEMENT - Page 20
<PAGE>

interfere with the ordinary conduct of business of the Borrower or any
Subsidiary; provided that the term "Permitted Encumbrances" shall not include
            --------                ----------------------
any Lien securing Indebtedness.

     "Permitted Holdings Debt" means Indebtedness of Holdings in respect of debt
      -----------------------
securities issued in an underwritten public offering or private placement
pursuant to Rule 144A; provided that (a) such Indebtedness shall not mature, nor
                       --------
shall any scheduled repayment of any principal thereof be due, nor shall such
Indebtedness be subject to any mandatory redemption or required repurchase,
conversion or exchange (whether upon the occurrence of any contingency or
otherwise, but excluding contingent redemption offer provisions in the event of
a "change of control" or "asset sale" that are customary for similar debt
securities), in each case prior to the date that is one year after the Maturity
Date, (b) any covenants, events of default and similar provisions relating
thereto shall be reasonably satisfactory to the Required Lenders, (c) the
obligations of Holdings in respect thereof shall not be Guaranteed by any other
Loan Party or secured by any Lien, (d) by its terms, no interest shall be
payable in respect of such Indebtedness (other than (i) by the issuance of
additional Permitted Holdings Debt or (ii) out of a cash reserve funded by
Holdings from the net proceeds of the issuance of such Indebtedness in an amount
sufficient to pay such cash interest) prior to the later of (A) the date that is
five years after the date of issuance of such Indebtedness or (B) June 30, 2005,
and (e) the net proceeds of such Indebtedness (other than the portion, if any,
of such net proceeds applied to fund any cash reserve established to fund
interest payments as provided above) are contributed by Holdings to the Borrower
as common equity.

     "Permitted Investments" means:
      ---------------------

     (a)   direct obligations of, or obligations the principal of and interest
on which are unconditionally guaranteed by, the United States of America (or by
any agency thereof to the extent such obligations are backed by the full faith
and credit of the United States of America), in each case maturing within one
year from the date of acquisition thereof;

     (b)   investments in commercial paper maturing within 270 days from the
date of acquisition thereof and having, at such date of acquisition, the highest
credit rating obtainable from S&P or from Moody's;

     (c)   investments in certificates of deposit, banker's acceptances and time
deposits maturing within 180 days from the date of acquisition thereof issued or
guaranteed by or placed with, and money market deposit accounts issued or
offered by, any domestic office of any commercial bank organized under the laws
of the United States of America or any State thereof which has a combined
capital and surplus and undivided profits of not less than $500,000,000; and

     (d)   fully collateralized repurchase agreements with a term of not more
than 30 days for securities described in clause (a) above and entered into with
                                         ----------
a financial institution satisfying the criteria described in clause (c) above.
                                                             ----------

     "Permitted License Acquisition Debt" means Indebtedness (other than FCC
      ----------------------------------
Debt) of any License Subsidiary in respect of the deferred purchase price of any
FCC License purchased by such License Subsidiary; provided that (a) such
Indebtedness shall not be secured by any Lien, other than a Lien on the Equity
Interests of the License Subsidiary that holds such FCC License, (b)
arrangements satisfactory to the Agents shall have been made for the Lien
granted under the

CREDIT AGREEMENT - Page 21
<PAGE>

Parent Pledge Agreement on the Equity Interests of such License Subsidiary to be
perfected, subject to the prior Lien referred to in clause (a) above, (c) such
                                                    ----------
Indebtedness shall mature within three years after the date such Indebtedness is
incurred, and (d) the holder of such Indebtedness shall have entered into an
agreement with the Administrative Agent, in form and substance reasonably
satisfactory to the Administrative Agent, pursuant to which such holder shall
have agreed to sell such Indebtedness to one or more of the Lenders or other
lenders with respect to Eligible Secured Debt upon demand if an Event of Default
has occurred and is continuing, for a purchase price equal to the outstanding
principal amount thereof and accrued and unpaid interest thereon.

     "Permitted Preferred Stock" means Disqualified Stock issued by Holdings;
      -------------------------
provided that (a) by its terms, no dividends shall be payable in respect of such
stock (other than by the issuance of additional shares of Permitted Preferred
Stock) prior to the date that is one year after the Maturity Date, (b) such
stock shall not mature or be subject to mandatory redemption or required
repurchase, conversion or exchange (whether upon the occurrence of any
contingency or otherwise) prior to the date that is one year after the Maturity
Date, (c) any obligations of Holdings in respect of such stock shall not be
Guaranteed by any other Loan Party or secured by any Lien, and (d) the net
proceeds of such stock are contributed by Holdings to the Borrower as common
equity.

     "Permitted Third Party Payments" means (a) payments, not exceeding
      ------------------------------
[*] in aggregate amount, in respect of the purchase price of equipment
and services purchased by the Borrower and its Subsidiaries other than pursuant
to the Purchase Agreement, provided that any such equipment becomes Collateral
under the Security Agreement upon the purchase thereof (free of any Liens other
than the Lien of the Security Agreement) and (b) payments, not exceeding
$50,000,000 in aggregate amount, in respect of the purchase price of any FCC
License that is acquired by a License Subsidiary and is to be used in the
business of the Borrower and its Subsidiaries after the purchase thereof,
provided that such FCC License is acquired by a License Subsidiary free of any
Liens and is not purchased subject to any FCC Debt, Permitted License
Acquisition Debt or other Indebtedness; provided that, unless otherwise agreed
by Nortel Networks, payments for equipment referred to in clause (a) above shall
                                                          ----------
be "Permitted Third Party Payments" only if and to the extent that such payments
    ------------------------------
are permitted to be financed with the proceeds of Loans hereunder in accordance
with the applicable provisions of the Purchase Agreement.

     "Person" means any natural person, corporation, limited liability company,
      ------
trust, joint venture, association, company, partnership, Governmental Authority
or other entity.

     "Plan" means any employee pension benefit plan (other than a Multiemployer
      ----
Plan) subject to the provisions of Title IV of ERISA or Section 412 of the Code
or Section 302 of ERISA, and in respect of which the Borrower or any ERISA
Affiliate is (or, if such plan were terminated, would under Section 4069 of
ERISA be deemed to be) an "employer" as defined in Section 3(5) of ERISA.
                           --------

     "Pledge Agreements" means the Borrower Pledge Agreement and the Parent
      -----------------
Pledge Agreement.

     "POPS" means, with respect to any geographical area, the most recent
      ----
projection of the population of such geographic area as published in a
demographic data source based upon the most recent U.S. Census Bureau data, such
data source to be reasonably agreed upon by the Administrative Agent and the
Borrower.

CREDIT AGREEMENT - Page 22

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

     "Prepayment Event" means:
      ----------------

     (a)   any sale, transfer or other disposition (including pursuant to a sale
and leaseback transaction) of any property or asset of the Borrower or any
Subsidiary Loan Party, other than pursuant to clause (i), (ii) or (iii) of
                                              ----------  ----    -----
Section 6.04(b); or
---------------

     (b)   any casualty or other insured damage to, or any taking under power of
eminent domain or by condemnation or similar proceeding of, any property or
asset of the Borrower or any Subsidiary Loan Party, but only to the extent that
the Net Proceeds therefrom have not been applied to repair, restore or replace
such property or asset within 180 days after such event.

     "Primary Subordinated Obligations" has the meaning assigned to such term in
      --------------------------------
the Subordination Agreement.

     "Prime Rate" means the rate of interest per annum published from time to
      ----------
time in the "Money Rates" column (or any successor column) of The Wall Street
Journal as the prime rate or, if such rate shall cease to be so published or is
not available for any reason, the rate of interest publicly announced from time
to time by any commercial bank based in New York City selected by the
Administrative Agent for the purpose of quoting such rate; provided that if at
any time the Person serving as Administrative Agent is a commercial bank based
in New York City then the "Prime Rate" shall be the rate of interest per annum
                           ----------
publicly announced from time to time by such bank as its prime rate in effect at
its principal office in New York City. Each change in the Prime Rate shall be
effective from and including the date such change is publicly announced as being
effective.

     "Purchase Agreement" means the System Equipment Purchase Agreement dated as
      ------------------
of August 28, 2000 between the Borrower and Nortel Networks.

     "Purchase Price" means amounts paid or payable by the Borrower to Nortel
      --------------
Networks pursuant to invoices delivered by Nortel Networks pursuant to the
Purchase Agreement, excluding any such amounts attributable to sales taxes,
provided, however, that (a) such invoices must relate to goods and/or services
--------  -------
purchased by the Borrower to be used by the Borrower or any Subsidiary of the
Borrower and (b) up to $15,000,000 in aggregate amount of such invoices
delivered by Nortel Networks may relate to construction services not performed
pursuant to the Purchase Agreement but performed by subcontractors to Nortel
Networks in or around the Pittsburgh, Pennsylvania area.

     "Real Estate Subsidiary" has the meaning assigned to such term in Section
      ----------------------                                           -------
6.12.
----

     "Register" has the meaning set forth in Section 9.04.
      --------                               ------------

     "Related Parties" means, with respect to any specified Person, such
      ---------------
Person's Affiliates and the respective directors, officers, employees, agents
and advisors of such Person and such Person's Affiliates.

     "Repayment" means, in respect of any Indebtedness, the direct or indirect
      ---------
repayment, prepayment, redemption, purchase, acquisition, defeasance, retirement
or other satisfaction of the

CREDIT AGREEMENT - Page 23
<PAGE>

principal of such Indebtedness, in whole or in part, whether optional or
mandatory. "Repay" has a meaning correlative thereto.
            -----

     "Required Lenders" means, at any time, Lenders having outstanding Loans and
      ----------------
Commitments representing more than 50% of the sum of the total outstanding Loans
and Commitments at such time; provided that at any time that Nortel Networks
                              --------
Lenders have outstanding Loans and Commitments representing more than 50% of the
sum of all outstanding Loans and Commitments at such time, "Required Lenders"
                                                            ----------------
means each of (i) the Nortel Networks Lenders at such time and (ii) other
Lenders holding more than 50% of the outstanding Loans and Commitments
(excluding those held by the Nortel Networks Lenders) at such time.

     "Restricted Payment" means (a) any dividend or other distribution (whether
      ------------------
in cash, securities or other property) with respect to any Equity Interests in
Holdings, the Borrower or any Subsidiary Loan Party, or any payment (whether in
cash, securities or other property), including any sinking fund or similar
deposit, on account of the purchase, redemption, retirement, acquisition,
cancellation or termination of any Equity Interest in Holdings, the Borrower or
any Subsidiary Loan Party or any option, warrant or other right to acquire any
such Equity Interest in Holdings, the Borrower or any Subsidiary Loan Party or
(b) any Repayment in respect of any Primary Subordinated Obligation or any
payment of interest thereon.

     "S&P" means Standard & Poor's.
      ---

     "Secondary Subordinated Obligation" has the meaning assigned to such term
      ---------------------------------
in the Subordination Agreement.

     "Security Agreement" means the Security Agreement dated as of November 24,
      ------------------
1999, among the Borrower, the Subsidiary Loan Parties and the Collateral Agent,
as supplemented by Supplement No. 1 dated as of March 20, 2000, Supplement No. 2
dated as of March 20, 2000, Supplement No. 3 dated as of March 20, 2000,
Supplement No. 4 dated as of April 28, 2000, Supplement No. 5 dated as of April
28, 2000, Supplement No. 6 dated as of April 28, 2000, Supplement No. 7 dated as
of April 28, 2000, Supplement No. 8 dated as of April 28, 2000, Supplement No. 9
dated as of April 28, 2000, Supplement No. 10 dated as of April 28, 2000,
Supplement No. 11 dated as of April 28, 2000, Supplement No. 12 dated as of
April 28, 2000, Supplement No. 13 dated as of April 28, 2000, and Supplement No.
14 dated as of April 28, 2000, true and correct photocopies of which have been
delivered to the Administrative Agent.

     "Security Documents" means the Collateral Agency Agreement, the Pledge
      ------------------
Agreements, the Security Agreement, the Mortgages and each other security
agreement or other instrument or document executed and delivered pursuant to
Section 5.11 or 5.12 to secure any of the Obligations.
------------    ----

     "Statutory Reserve Rate" means a fraction (expressed as a decimal), the
      ----------------------
numerator of which is the number one and the denominator of which is the number
one minus the aggregate of the maximum reserve percentages (including any
    -----
marginal, special, emergency or supplemental reserves) expressed as a decimal
established by the Board to which any commercial banks subject to regulation by
the Board are subject with respect to the Adjusted LIBO Rate, for eurocurrency
funding (currently referred to as "Eurocurrency Liabilities" in Regulation D of
the Board).  Such reserve percentages shall include those imposed pursuant to
such Regulation D.  LIBOR Loans shall

CREDIT AGREEMENT - Page 24
<PAGE>

be deemed to constitute eurocurrency funding and to be subject to such reserve
requirements without benefit of or credit for proration, exemptions or offsets
that may be available from time to time to any Lender under such Regulation D or
any comparable regulation. The Statutory Reserve Rate shall be adjusted
automatically on and as of the effective date of any change in any reserve
percentage.

     "Subordination Agreement" means the Subordination Agreement dated as of
      -----------------------
November 24, 1999, among the Loan Parties and the Collateral Agent, as
supplemented by Supplement No. 1 dated as of March 20, 2000, Supplement No. 2
dated as of March 20, 2000, Supplement No. 3 dated as of March 20, 2000,
Supplement No. 4 dated as of April 28, 2000, Supplement No. 5 dated as of April
28, 2000, Supplement No. 6 dated as of April 28, 2000, Supplement No. 7 dated as
of April 28, 2000, Supplement No. 8 dated as of April 28, 2000, Supplement No. 9
dated as of April 28, 2000, Supplement No. 10 dated as of April 28, 2000,
Supplement No. 11 dated as of April 28, 2000, Supplement No. 12 dated as of
April 28, 2000, Supplement No. 13 dated as of April 28, 2000, and Supplement No.
14 dated as of April 28, 2000, true and correct photocopies of which have been
delivered to the Administrative Agent, as amended by an amendment thereto in the
form of the amendment attached hereto as Exhibit G.
                                         ---------

     "Subscribers" means customers that are purchasing wireless
      -----------
telecommunications service from the Borrower or any of its operating
Subsidiaries.

     "subsidiary" means, with respect to any Person (the "parent") at any date,
      ----------                                          ------
any corporation, limited liability company, partnership, association or other
entity the accounts of which would be consolidated with those of the parent in
the parent's consolidated financial statements if such financial statements were
prepared in accordance with GAAP as of such date, as well as any other
corporation, limited liability company, partnership, association or other entity
(a) of which securities or other ownership interests representing more than 50%
of the equity or more than 50% of the ordinary voting power or, in the case of a
partnership, more than 50% of the general partnership interests are, as of such
date, owned, controlled or held, or (b) that is, as of such date, otherwise
Controlled, by the parent or one or more subsidiaries of the parent or by the
parent and one or more subsidiaries of the parent.

     "Subsidiary" means any subsidiary of the Borrower.
      ----------

     "Subsidiary Loan Parties" means the Subsidiaries and the License
      -----------------------
Subsidiaries.

     "Taxes" means any and all present or future taxes, levies, imposts, duties,
      -----
deductions, charges or withholdings imposed by any Governmental Authority.

     "Total Capitalization" means, as of any date, the sum (without duplication)
      --------------------
of (a) Total Indebtedness as of such date, plus (b) Total Contributed Capital as
                                           ----
of such date, plus (c) if positive, consolidated retained earnings of the
              ----
Borrower and the Subsidiary Loan Parties as of such date.

     "Total Contributed Capital" means, as of any date, the sum (without
      -------------------------
duplication) of (a) the amount of consolidated paid-in equity capital of the
Borrower and the Subsidiary Loan Parties as of such date, plus (b) the
                                                          ----
outstanding principal amount of Indebtedness consisting of Primary Subordinated
Obligations as of such date; provided that "Total Contributed Capital" shall not
                             --------       -------------------------
include any of the foregoing to the extent that the consideration received by
the Borrower and the Subsidiary

CREDIT AGREEMENT - Page 25
<PAGE>

Loan Parties therefore did not consist of either (i) cash or (ii) assets useful
in the business of the Borrower and the Subsidiary Loan Parties that the
Borrower and the Subsidiary Loan Parties would have been permitted to acquire
hereunder if cash had been received by the Borrower as consideration therefor.
Any assets referred to in clause (ii) of the preceding sentence shall be valued
                          -----------
at the lesser of the cost or fair market value of such assets at the time
received by the Borrower and the Subsidiary Loan Parties, it being understood
that costs incurred and assets contributed to capital of the Borrower prior to
the Effective Date and treated as paid-in equity capital in accordance with GAAP
shall be valued at the amount reflected on the Borrower's balance sheet as paid-
in equity capital in accordance with GAAP.

     "Total Indebtedness" means, as of any date, the sum of (a) the aggregate
      ------------------
principal amount of Indebtedness of the Borrower and the Subsidiary Loan Parties
outstanding as of such date (excluding Indebtedness that constitutes a Primary
Subordinated Obligation), in the amount that would be reflected on a balance
sheet prepared as of such date on a consolidated basis in accordance with GAAP,
plus (b) the aggregate principal amount of Indebtedness of the Borrower and the
----
Subsidiary Loan Parties outstanding as of such date (excluding Indebtedness that
constitutes a Primary Subordinated Obligation) that is not required to be
reflected on a balance sheet in accordance with GAAP, determined on a
consolidated basis; provided that, for purposes of clause (b) above, the term
"Indebtedness" shall not include contingent obligations of the Borrower or any
 ------------
Subsidiary as an account party in respect of any letter of credit or letter of
guaranty unless such letter of credit or letter of guaranty supports an
obligation that constitutes Indebtedness.

     "Transactions" means the execution, delivery and performance by the Loan
      ------------
Parties of the Loan Documents, the borrowing of Loans and the use of the
proceeds thereof.

     "Type", when used in reference to any Loan or Borrowing, refers to whether
      ----
the rate of interest on such Loan, or on the Loans comprising such Borrowing, is
determined by reference to the Adjusted LIBO Rate or the Alternate Base Rate.

     "Withdrawal Liability" means liability to a Multiemployer Plan as a result
      --------------------
of a complete or partial withdrawal from such Multiemployer Plan, as such terms
are defined in Part I of Subtitle E of Title IV of ERISA.

     Section 1.02  Classification of Loans and Borrowings. For purposes of this
                   --------------------------------------
Agreement, Loans may be classified and referred to by Type (e.g., a "LIBOR
                                                                     -----
Loan"). Borrowings also may be classified and referred to by Type (e.g., a
----
"LIBOR Borrowing").
 ---------------

     Section 1.03  Terms Generally. The definitions of terms herein shall apply
                   ---------------
equally to the singular and plural forms of the terms defined. Whenever the
context may require, any pronoun shall include the corresponding masculine,
feminine and neuter forms. The words "include", "includes" and "including" shall
                                      -------    --------       ---------
be deemed to be followed by the phrase "without limitation". The word "will"
                                        ------------------             ----
shall be construed to have the same meaning and effect as the word "shall".
                                                                    -----
Unless the context requires otherwise (a) any definition of or reference to any
agreement, instrument or other document herein shall be construed as referring
to such agreement, instrument or other document as from time to time amended,
supplemented or otherwise modified (subject to any restrictions on such
amendments, supplements or modifications set forth herein or in any other Loan
Document),

CREDIT AGREEMENT - Page 26
<PAGE>

(b) any reference herein to any Person shall be construed to include such
Person's successors and assigns, (c) the words "herein", "hereof" and
                                                ------    ------
"hereunder", and words of similar import, shall be construed to refer to this
 ---------
Agreement in its entirety and not to any particular provision hereof, (d) all
references herein to Articles, Sections, Exhibits and Schedules shall be
construed to refer to Articles and Sections of, and Exhibits and Schedules to,
this Agreement and (e) the words "asset" and "property" shall be construed to
                                  -----       --------
have the same meaning and effect and to refer to any and all tangible and
intangible assets and properties, including cash, securities, accounts, contract
rights, licenses and intellectual property.

     Section 1.04  Accounting Terms; GAAP; Consolidation of License
                   ------------------------------------------------
Subsidiaries.
------------

     (a)   Except as otherwise expressly provided herein, all terms of an
accounting or financial nature shall be construed in accordance with GAAP, as in
effect from time to time; provided that, if the Borrower notifies the
Administrative Agent that the Borrower requests an amendment to any provision
hereof to eliminate the effect of any change occurring after the date hereof in
GAAP or in the application thereof on the operation of such provision (or if the
Administrative Agent notifies the Borrower that the Required Lenders request an
amendment to any provision hereof for such purpose), regardless of whether any
such notice is given before or after such change in GAAP or in the application
thereof, then such provision shall be interpreted on the basis of GAAP as in
effect and applied immediately before such change shall have become effective
until such notice shall have been withdrawn or such provision amended in
accordance herewith.

     (b)   Any determination required to be made under any Loan Document with
respect to the Borrower and the Subsidiary Loan Parties on a consolidated basis
shall be made as though the License Subsidiaries were consolidated subsidiaries
of the Borrower.

                                  ARTICLE II

                                  The Loans
                                  ---------

     Section 2.01  Commitments. Subject to the terms and conditions set forth
                   -----------
herein, each Lender agrees to make Loans to the Borrower at any time and from
time to time during the Availability Period in an aggregate principal amount not
exceeding its remaining Commitment at the time.  Amounts repaid in respect of
Loans may not be reborrowed.

     Section 2.02  Loans and Borrowings.
                   --------------------

     (a)   Each Loan shall be made as part of a Borrowing consisting of Loans of
the same Type made by the Lenders ratably in accordance with their respective
Commitments; provided that if a Commitment is assigned by Nortel Networks (in
             --------
its capacity as a Lender) after a receipt of a Borrowing Request in order to
permit the assignee to fund all or a portion of the Loan that otherwise would
have been funded by Nortel Networks in connection with such Borrowing Request
(any such assigned Commitment, a "Fronting Commitment"), Nortel Networks'
ratable share of such Borrowing shall equal (w) Nortel Networks' ratable share
of such Borrowing calculated without giving effect to such assignment minus (x)
the amount of such Fronting Commitment, and the assignee's ratable portion of
such Borrowing shall equal the sum of (y) such assignee's ratable share

CREDIT AGREEMENT - Page 27
<PAGE>

of such Borrowing calculated without giving effect to any assignment under which
such assignee was assigned a Fronting Commitment plus (z) the amount of such
Fronting Commitment. The failure of any Lender to make any Loan required to be
made by it shall not relieve any other Lender of its obligations hereunder;
provided that the Commitments of the Lenders are several and no Lender shall be
responsible for any other Lender's failure to make Loans as required.

     (b)   Subject to Section 2.12, each Borrowing shall be comprised entirely
                      ------------
of LIBOR Loans or ABR Loans as the Borrower may request in accordance herewith.
Each Lender at its option may make any LIBOR Loan by causing any domestic or
foreign branch or Affiliate of such Lender to make such Loan; provided that any
exercise of such option shall not affect the obligation of the Borrower to repay
such Loan in accordance with the terms of this Agreement.

     (c)   At the commencement of each Interest Period for any LIBOR Borrowing,
such Borrowing shall be in an aggregate amount that is an integral multiple of
$1,000,000 and not less than $3,000,000.  At the time that each ABR Borrowing
(other than an Interest Borrowing) is made, such Borrowing shall be in an
aggregate amount that is not less than $3,000,000; provided that an ABR
                                                   --------
Borrowing may be in an aggregate amount that is equal to the entire remaining
Commitments. Borrowings of more than one Type may be outstanding at the same
time; provided that there shall not at any time be more than a total of 12 LIBOR
      --------
Borrowings outstanding.

     (d)   Notwithstanding any other provision of this Agreement, the Borrower
shall not be entitled to request, or to elect to convert or continue, any
Borrowing as a LIBOR Borrowing if the Interest Period requested with respect
thereto would end after the Maturity Date.

     Section 2.03  Requests for Borrowings.
                   -----------------------

     (a)   To request a Borrowing, the Borrower shall notify the Administrative
Agent of such request by telephone not later than 11:00 a.m., New York City
time, three Business Days before the date of the proposed Borrowing; provided
that, except for Interest Borrowings, the Borrower may make only one request for
a Borrowing in any single calendar month (it being understood that all
Borrowings made by the Borrower on the same date shall be treated as a single
request for a Borrowing for purposes of this limitation).  Each such telephonic
Borrowing Request shall be irrevocable and shall be confirmed promptly by hand
delivery or telecopy to the Administrative Agent of a written Borrowing Request
in a form approved by the Administrative Agent and signed by the Borrower.  Each
such telephonic and written Borrowing Request shall specify the following
information in compliance with Section 2.02:
                               ------------

     (i)   the aggregate amount of such Borrowing and the use of proceeds
therefrom (and each written Borrowing Request shall attach copies of the
invoices to be paid with such proceeds, except to the extent such Borrowing is
to be applied to pay fees and interest payable hereunder);

     (ii)  the date of such Borrowing, which shall be a Business Day;

     (iii) whether such Borrowing is to be a LIBOR Borrowing or an ABR
Borrowing;

CREDIT AGREEMENT - Page 28
<PAGE>

     (iv)  in the case of a LIBOR Borrowing, the initial Interest Period to be
applicable thereto, which shall be a period contemplated by the definition of
the term "Interest Period"; and
          ---------------

     (v)   if any proceeds of such Borrowing are to be applied to pay the
purchase price of Permitted Third Party Payments, the location and number of the
Borrower's account to which funds are to be disbursed, which shall comply with
Section 2.04.
------------

If no election as to the Type of Borrowing is specified, then the requested
Borrowing shall be an ABR Borrowing.  If no Interest Period is specified with
respect to any requested LIBOR Borrowing, then the Borrower shall be deemed to
have selected an Interest Period of one month's duration. Promptly following
receipt of a Borrowing Request in accordance with this Section, the
Administrative Agent shall advise each Lender of the details thereof and of the
amount of such Lender's Loan to be made as part of the requested Borrowing.

     (b)   Notwithstanding anything to the contrary contained in this Agreement,
the Administrative Agent shall, at the request of Nortel Networks so long as it
is the only Lender hereunder, cause Loans to be advanced by the Lenders for and
on behalf of the Borrower whether or not (i) any Borrowings Request is given in
accordance with Section 2.03(a), (ii) any of the conditions precedent set forth
                ---------------
in Article IV hereof are satisfied, (iii) any Default exists, or (iv) any other
   ----------
fact or circumstance exists, if Nortel Networks shall have given five Business
Day's prior written notice to the Administrative Agent and the Borrower of
Nortel Networks' desire to cause the Lenders to make such Loans and all proceeds
of such Loans are used to pay the Purchase Price for Nortel Networks goods
and/or services which has not been disputed and which has not been paid when
due.  All Loans advanced pursuant to this Section 2.03(b) shall be initially
                                          ---------------
advanced as LIBOR Borrowings with a one month Interest Period (unless the
Borrower has requested in writing, at least three Business Days prior to such
advance, that any of such Loans have an Interest Period with a different
duration in accordance with the requirements of this Agreement) or, if the
maximum number of Interest Periods for LIBOR Borrowings is already then in
effect, as ABR Borrowings (but after such advancement, may be converted or
continued in accordance with Section 2.05 of this Agreement).
                             ------------

     Section 2.04  Funding of Borrowings.
                   ---------------------

     (a)   Each Lender shall make each Loan to be made by it hereunder on the
proposed date thereof by wire transfer of immediately available funds by 12:00
noon, New York City time, to the account of the Administrative Agent most
recently designated by it for such purpose by notice to the Lenders. Such
account shall be in New York, New York.  The Administrative Agent will make such
Loans available to the Borrower (i) in the case of amounts payable to Nortel
Networks, by promptly crediting the amounts so received, in like funds, to an
account of Nortel Networks maintained with the Administrative Agent and
designated by Nortel Networks for such purpose, (ii) in the case of amounts
payable to either Agent or any Lender, by promptly transmitting the amounts so
received to such Agent or Lender by wire transfer (or by crediting the account
of such Agent or Lender maintained with the Administrative Agent, if
applicable), in immediately available funds, or (iii) in the case of any other
amounts, by promptly transmitting the amounts so received to the Borrower by
wire transfer to an account of the Borrower in New York, New York (or crediting
the account of the Borrower maintained with the Administrative Agent in New
York, New York, if applicable), in

CREDIT AGREEMENT - Page 29
<PAGE>

immediately available funds, as designated by the Borrower in the applicable
Borrowing Request. Notwithstanding the foregoing, (i) any Lender may make its
Loan by crediting the amount thereof against any amount payable to such Lender
from the proceeds of such Borrowing and shall be deemed to have made a Loan in
the amount of such credit and (ii) the Administrative Agent will make the Loans
of the other Lenders available as provided in the preceding sentence. So long as
Nortel Networks is the Administrative Agent, any amounts to be made available or
paid as provided above to an account maintained with the Administrative Agent
may be made available or paid to an account maintained with a commercial bank
designated by Nortel Networks for the purpose.

     (b)   Unless the Administrative Agent shall have received notice from a
Lender prior to the proposed date of any Borrowing that such Lender will not
make available to the Administrative Agent such Lender's share of such
Borrowing, the Administrative Agent may assume that such Lender has made such
share available on such date in accordance with paragraph (a) of this Section
                                                -------------
and may, in reliance upon such assumption, make available to the Borrower a
corresponding amount. In such event, if a Lender has not in fact made its share
of the applicable Borrowing available to the Administrative Agent, then the
applicable Lender and the Borrower severally agree to pay to the Administrative
Agent forthwith on demand such corresponding amount with interest thereon, for
each day from and including the date such amount is made available to the
Borrower to but excluding the date of payment to the Administrative Agent, at
(i) in the case of such Lender, the greater of the Federal Funds Effective Rate
and a rate determined by the Administrative Agent in accordance with banking
industry rules on interbank compensation or (ii) in the case of the Borrower,
the interest rate applicable to ABR Loans.  If such Lender pays such amount to
the Administrative Agent, then such amount shall constitute such Lender's Loan
included in such Borrowing.

     Section 2.05  Interest Elections.
                   ------------------

     (a)   Each Borrowing initially shall be of the Type specified in the
applicable Borrowing Request and, in the case of a LIBOR Borrowing, shall have
an initial Interest Period as specified in such Borrowing Request.  Thereafter,
the Borrower may elect to convert such Borrowing to a different Type or to
continue such Borrowing and, in the case of a LIBOR Borrowing, may elect
Interest Periods therefor, all as provided in this Section.  The Borrower may
elect different options with respect to different portions of the affected
Borrowing, in which case each such portion shall be allocated ratably among the
Lenders holding the Loans comprising such Borrowing, and the Loans comprising
each such portion shall be considered a separate Borrowing.

     (b)   To make an election pursuant to this Section, the Borrower shall
notify the Administrative Agent of such election by telephone by the time that a
Borrowing Request would be required under Section 2.03 if the Borrower were
                                          ------------
requesting a Borrowing of the Type resulting from such election to be made on
the effective date of such election. Each such telephonic Interest Election
Request shall be irrevocable and shall be confirmed promptly by hand delivery or
telecopy to the Administrative Agent of a written Interest Election Request in a
form approved by the Administrative Agent and signed by the Borrower.

     (c)   Each telephonic and written Interest Election Request shall specify
the following information in compliance with Section 2.02:
                                             ------------

CREDIT AGREEMENT - Page 30
<PAGE>

     (i)   the Borrowing to which such Interest Election Request applies and, if
different options are being elected with respect to different portions thereof,
the portions thereof to be allocated to each resulting Borrowing (in which case
the information to be specified pursuant to clauses (iii) and (iv) below shall
                                            -------------     ----
be specified for each resulting Borrowing);

     (ii)  the effective date of the election made pursuant to such Interest
Election Request, which shall be a Business Day;

     (iii) whether the resulting Borrowing is to be a LIBOR Borrowing or an ABR
Borrowing; and

     (iv)  if the resulting Borrowing is a LIBOR Borrowing, the Interest Period
to be applicable thereto after giving effect to such election, which shall be a
period contemplated by the definition of the term "Interest Period". If any such
Interest Election Request requests a LIBOR Borrowing but does not specify an
Interest Period, then the Borrower shall be deemed to have selected an Interest
Period of one month's duration.

     (d)   Promptly following receipt of an Interest Election Request, the
Administrative Agent shall advise each Lender of the details thereof and of such
Lender's portion of each resulting Borrowing.

     (e)   If the Borrower fails to deliver a timely Interest Election Request
with respect to a LIBOR Borrowing prior to the end of the Interest Period
applicable thereto, then, unless such Borrowing is repaid as provided herein, at
the end of such Interest Period such Borrowing shall be converted to an ABR
Borrowing.  Notwithstanding any contrary provision hereof, if an Event of
Default has occurred and is continuing and the Administrative Agent, at the
request of the Required Lenders, so notifies the Borrower, then, so long as an
Event of Default is continuing (i) no outstanding Borrowing may be converted to
or continued as a LIBOR Borrowing and (ii) unless repaid, each LIBOR Borrowing
shall be converted to an ABR Borrowing at the end of the Interest Period
applicable thereto.

     Section 2.06  Termination and Reduction of Commitments.
                   ----------------------------------------

     (a)   Unless previously terminated, the Commitments shall terminate on the
earlier of (i) the Availability Termination Date or (ii) the date of termination
of the Purchase Agreement.

     (b)   On the date of each Loan made by any Lender, such Lender's Commitment
shall be reduced by an amount equal to such Loan.

     (c)   In the event that a prepayment of Loans would be required pursuant to
paragraph (b), (c) or (d) of Section 2.09, all Commitments then in effect shall
-------------  ---    ---    ------------
be reduced ratably by an aggregate amount equal to the excess, if any, of the
amount of the required prepayment (without regard to the aggregate principal
amount of the Loans then outstanding) over the aggregate principal amount of the
Loans outstanding immediately prior to giving effect to such prepayment.

CREDIT AGREEMENT - Page 31
<PAGE>

     (d)   The Borrower may at any time terminate, or from time to time reduce,
the Commitments; provided that each reduction of the Commitments pursuant to
this paragraph (d) shall be in an amount that is an integral multiple of
     -------------
$1,000,000 and not less than $5,000,000.

     (e)   The Borrower shall notify the Administrative Agent of any election to
terminate or reduce the Commitments under paragraph (d) of this Section at least
                                          -------------
three Business Days prior to the effective date of such termination or
reduction, specifying such election and the effective date thereof.  Promptly
following receipt of any such notice, the Administrative Agent shall advise the
Lenders of the contents thereof. Each notice delivered by the Borrower pursuant
to this Section shall be irrevocable. Any termination or reduction of the
Commitments shall be permanent.  Each reduction of the Commitments pursuant to
paragraph (d) of this Section shall be made ratably among the Lenders in
-------------
accordance with their respective Commitments.

     Section 2.07  Repayment of Loans; Evidence of Debt.
                   ------------------------------------

     (a)   The Borrower hereby unconditionally promises to pay to the
Administrative Agent for the account of each Lender the then unpaid principal
amount of each Loan of such Lender as provided in Section 2.08.
                                                  ------------

     (b)   Each Lender shall maintain in accordance with its usual practice an
account or accounts evidencing the indebtedness of the Borrower to such Lender
resulting from each Loan made by such Lender, including the amounts of principal
and interest payable and paid to such Lender from time to time hereunder.

     (c)   The Administrative Agent shall maintain accounts in which it shall
record (i) the amount of each Loan made hereunder and Type thereof and the
Interest Period applicable thereto, (ii) the amount of any principal or interest
due and payable or to become due and payable from the Borrower to each Lender
hereunder and (iii) the amount of any sum received by the Administrative Agent
hereunder for the account of the Lenders and each Lender's share thereof.

     (d)   The entries made in the accounts maintained pursuant to paragraph (b)
                                                                   -------------
or (c) of this Section shall be prima facie evidence of the existence and
   ---
amounts of the obligations recorded therein; provided that the failure of any
Lender or the Administrative Agent to maintain such accounts or any error
therein shall not in any manner affect the obligation of the Borrower to repay
the Loans in accordance with the terms of this Agreement.

     (e)   Any Lender may request that Loans made by it be evidenced by a
promissory note. In such event, the Borrower shall prepare, execute and deliver
to such Lender a promissory note payable to the order of such Lender (or, if
requested by such Lender, to such Lender and its registered assigns) and in a
form approved by the Administrative Agent.  Thereafter, the Loans evidenced by
such promissory note and interest thereon shall at all times (including after
assignment pursuant to Section 9.04) be represented by one or more promissory
                       ------------
notes in such form payable to the order of the payee named therein (or, if such
promissory note is a registered note, to such payee and its registered assigns).

CREDIT AGREEMENT - Page 32
<PAGE>

     Section 2.08  Amortization of Loans.
                   ---------------------

     (a)   Subject to adjustment pursuant to paragraph (c) of this Section, the
Borrower shall repay Borrowings on each Payment Date set forth below in an
aggregate amount equal to the percentage set forth opposite such Payment Date
multiplied by an amount equal to the sum of all Loans made during the
Availability Period (whether or not previously repaid):

     -----------------------------------------------------------------------
                     Payment Date                                Percentage
     -----------------------------------------------------------------------

     Each of first, second, third and fourth                       2.50%
     -----------------------------------------------------------------------

     Each of fifth, sixth, seventh and eighth                      3.75%
     -----------------------------------------------------------------------

     Each of ninth, tenth, eleventh and twelfth                    5.00%
     -----------------------------------------------------------------------

     Each of thirteenth, fourteenth, fifteenth and sixteenth       6.25%
     -----------------------------------------------------------------------

     Each of seventeenth, eighteenth, nineteenth and twentieth     7.50%
     -----------------------------------------------------------------------

     (b)   To the extent not previously paid, all Loans shall be due and payable
on the Maturity Date.

     (c)   Any prepayment of a Borrowing shall be applied to reduce the
subsequent scheduled repayments of the Borrowings to be made pursuant to this
Section in the inverse order of maturity thereof.

     (d)   Prior to any repayment of any Borrowings hereunder, the Borrower
shall select the Borrowing or Borrowings to be repaid and shall notify the
Administrative Agent by telephone (confirmed by telecopy) of such selection not
later than 2:00 p.m., New York City time, three Business Days before the
scheduled date of such repayment; provided that the Borrower shall select
Borrowings to be repaid such that each Lender shall receive its pro rata share
of such repayment as provided in Section 2.16. Each repayment of a Borrowing
                                 ------------
shall be applied ratably to the Loans included in the repaid Borrowing.
Repayments of Borrowings shall be accompanied by the payment of accrued interest
on the amount thereof.

     Section 2.09  Prepayment of Loans.
                   -------------------

     (a)   The Borrower shall have the right at any time and from time to time
to prepay any Borrowing in whole or in part, subject to the requirements of this
Section.

     (b)   Subject to paragraph (g) of this Section, in the event and on each
                      -------------
occasion that any Net Proceeds are received by or on behalf of the Borrower or
any Subsidiary Loan Party in respect of any Prepayment Event, the Borrower
shall, within three Business Days after such Net Proceeds are received, prepay
Borrowings in an aggregate principal amount equal to such Net Proceeds; provided
that, in the case of any event described in clause (a) of the definition of the
                                            ----------
term Prepayment Event, if the Borrower shall deliver to the Administrative Agent
a certificate of a

CREDIT AGREEMENT - Page 33
<PAGE>

Financial Officer to the effect that the Borrower and the Subsidiaries intend to
apply the Net Proceeds from such event (or a portion thereof specified in such
certificate), within 180 days after receipt of such Net Proceeds, to acquire
real property, equipment or other tangible assets to be used in the business of
the Borrower and the Subsidiaries, and certifying that no Default has occurred
and is continuing, then no prepayment shall be required pursuant to this
paragraph in respect of the Net Proceeds in respect of such event (or the
portion of such Net Proceeds specified in such certificate, if applicable)
except to the extent of any such Net Proceeds therefrom that have not been so
applied by the end of such 180-day period, at which time a prepayment shall be
required in an amount equal to such Net Proceeds that have not been so applied.

     (c)   Subject to paragraph (g) of this Section, following the end of each
                      -------------
fiscal year of the Borrower, commencing with the fiscal year during which the
Availability Termination Date occurs, the Borrower shall prepay Borrowings in an
aggregate principal amount equal to 50% of Excess Cash Flow for such fiscal
year. Each prepayment pursuant to this paragraph shall be made on or before the
date on which financial statements are delivered pursuant to Section 5.01 with
                                                             ------------
respect to the fiscal year for which Excess Cash Flow is being calculated (and
in any event within 90 days after the end of such fiscal year).

     (d)   In the event and on each occasion that the Borrower or any Subsidiary
Loan Party Repays any Indebtedness of the Borrower or any Subsidiary Loan Party,
the Borrower shall, within three Business Days after the date of such Repayment,
prepay Borrowings in an aggregate amount equal to the product of (x) the sum of
the aggregate principal amount of the Loans outstanding at the time, multiplied
by (y) a fraction, the numerator of which is the aggregate principal amount of
such Repayment, and the denominator of which is the amount of Total Indebtedness
immediately prior to such Repayment (excluding Indebtedness in respect of the
Loans and Indebtedness outstanding under revolving credit facilities); provided
                                                                       --------
that prepayments of Borrowings shall not be required pursuant to this paragraph
in respect of (i) Repayments of Loans, (ii) any Repayment of Indebtedness to the
extent such Repayment is refinanced by incurring other Indebtedness that (A) has
a scheduled maturity date that is on or after the scheduled maturity date of the
Indebtedness being refinanced, (B) has a weighted average life to maturity that
is equal to or longer than the remaining weighted average life to maturity of
the Indebtedness being refinanced, determined immediately prior to giving effect
to such Repayment, (C) does not include any provisions that may require
mandatory Repayment thereof prior to scheduled maturity, other than scheduled
repayments taken into consideration in determining compliance with clause (B)
                                                                   ----------
above and other provisions that are not materially more burdensome than any such
provisions included in the Indebtedness being refinanced, (D) is issued or
incurred by the same Person that issued or incurred the Indebtedness being
refinanced and is not Guaranteed or secured by any Lien unless the Indebtedness
being refinanced was Guaranteed or secured (in which case such Indebtedness
shall not be Guaranteed by any Person that did not Guarantee the Indebtedness
being refinanced and shall not be secured by a Lien on any asset that did not
secure the Indebtedness being refinanced), and (E) is subordinated to the
Obligations on terms no less favorable than the terms on which the Indebtedness
being refinanced was so subordinated, if such refinanced Indebtedness was so
subordinated, (iii) any Repayment of Indebtedness outstanding under a revolving
credit facility to the extent that (A) the commitments of the lenders to make
loans thereunder remain in effect after giving effect to such Repayment or are
replaced by commitments under a replacement revolving credit facility and (B)
such commitments are not reduced within six months thereafter, (iv) any
Repayment of secured Indebtedness in

CREDIT AGREEMENT - Page 34
<PAGE>

connection with the sale of the assets securing such Indebtedness, (v) any
Repayment of Indebtedness at the scheduled final maturity thereof or in
accordance with regularly scheduled amortization requirements prior to maturity
or (vi) any Repayment of other Eligible Secured Debt that constitutes a
mandatory prepayment thereof in respect of a Prepayment Event or Excess Cash
Flow, to the extent that the Lenders receive a pro rata prepayment in respect of
such event pursuant to paragraph (b) or (c) of this Section.
                       -------------    ---

     (e)   Prior to any optional or mandatory prepayment of Borrowings
hereunder, the Borrower shall select the Borrowing or Borrowings to be prepaid
and shall specify such selection in the notice of such prepayment pursuant to
paragraph (f) of this Section; provided that the Borrower shall select
------------                   --------
Borrowings to be prepaid such that each Lender shall receive its pro rata share
of such prepayment as provided in Section 2.16.
                                  ------------

     (f)   The Borrower shall notify the Administrative Agent by telephone
(confirmed by telecopy) of any prepayment hereunder not later than 11:00 a.m.,
New York City time, three Business Days before the date of prepayment.  Each
such notice shall be irrevocable and shall specify the prepayment date, the
principal amount of each Borrowing or portion thereof to be prepaid and, in the
case of a mandatory prepayment, a reasonably detailed calculation of the amount
of such prepayment. Promptly following receipt of any such notice, the
Administrative Agent shall advise the Lenders of the contents thereof.  Each
partial prepayment of any Borrowing shall be in an amount that would be
permitted in the case of an advance of a Borrowing of the same Type as provided
in Section 2.02, except as necessary to apply fully the required amount of a
   ------------
mandatory prepayment. Each prepayment of a Borrowing shall be applied ratably to
the Loans included in the prepaid Borrowing.  Prepayments of Borrowings shall be
accompanied by the payment of accrued interest on the amount prepaid.

     (g)   If any other Eligible Secured Debt is outstanding at the time that
any mandatory prepayment of Borrowings is required to be made pursuant to
paragraph (b) or (c) of this Section, then, to the extent that the terms of any
-------------    ---
such other Eligible Secured Debt require that a mandatory prepayment be made of
such other Eligible Secured Debt pursuant to corresponding provisions applicable
thereto, the aggregate principal amount of such prepayment required to be made
hereunder shall be reduced by the aggregate principal amount of such
corresponding prepayments required to be made in respect of other Eligible
Secured Debt; provided that, in any event, each mandatory prepayment of
Borrowings required to be made pursuant to paragraph (b) or (c) of this Section
                                           -------------    ---
shall be in an aggregate principal amount not less than (i) the aggregate
principal amount of Borrowings that would be required to be prepaid if no other
Eligible Secured Debt was outstanding at the time, multiplied by (ii) a
fraction, the numerator of which is the outstanding principal amount of Loans at
the time of and before giving effect to such prepayment and the denominator of
which is the aggregate principal amount of all Eligible Secured Debt (including
the Loans) outstanding at such time the terms of which require such mandatory
prepayment.

     Section 2.10  Fees.
                   ----

     (a)   The Borrower agrees to pay to the Administrative Agent for the
account of each Lender a commitment fee, which shall accrue at the Commitment
Fee Rate on the daily amount of the Commitment of such Lender during the period
from and including the Effective Date to but

CREDIT AGREEMENT - Page 35
<PAGE>

excluding the date on which the Commitments terminate. Accrued commitment fees
shall be payable in arrears on the last day of March, June, September and
December of each year and on the date on which the Commitments terminate,
commencing on the first such date to occur after the Effective Date. All
commitment fees shall be computed on the basis of a year of 360 days and shall
be payable for the actual number of days elapsed (including the first day but
excluding the last day).

     (b)   The Borrower agrees to pay to Nortel Networks, for its own account,
fees in the amounts and at the times separately agreed.

     (c)   The Borrower agrees to pay to the Administrative Agent and the
Collateral Agent (if other than Nortel Networks), for its own account, fees in
the amounts and at the times separately agreed.

     (d)   All fees payable hereunder shall be paid on the dates due, in
immediately available funds, (i) to the applicable Agent, (ii) to Nortel
Networks, in the case of fees payable to it, or (iii) to the Administrative
Agent, in the case of commitment fees, for distribution to the Lenders entitled
thereto. Fees paid shall not be refundable under any circumstances.

     Section 2.11  Interest.
                   --------

     (a)   The Loans comprising each ABR Borrowing shall bear interest at the
Alternate Base Rate plus the Applicable Margin.
                    ----

     (b)   The Loans comprising each LIBOR Borrowing shall bear interest at the
Adjusted LIBO Rate for the Interest Period in effect for such Borrowing plus the
                                                                        ----
Applicable Margin.

     (c)   Notwithstanding the foregoing, if any principal of or interest on any
Loan or any fee or other amount payable by the Borrower hereunder is not paid
when due, whether at stated maturity, upon acceleration or otherwise, such
overdue amount shall bear interest, after as well as before judgment, at a rate
per annum equal to 2% plus the rate applicable to ABR Loans as provided in
                      ----
paragraph (a) of this Section.
-------------

     (d)   All accrued interest on each Loan shall be payable in arrears on each
Interest Payment Date for such Loan; provided that (i) interest accrued pursuant
to paragraph (c) of this Section shall be payable on demand, (ii) in the event
   -------------
of any repayment or prepayment of any Loan, accrued interest on the principal
amount of such Loan repaid or prepaid shall be payable on the date of such
repayment or prepayment, and (iii) in the event of any conversion of any Loan
prior to the end of the current Interest Period therefor, accrued interest on
such Loan shall be payable on the effective date of such conversion.

     (e)   All interest hereunder shall be computed on the basis of a year of
360 days, except that interest computed by reference to the Alternate Base Rate
at times when the Alternate Base Rate is based on the Prime Rate shall be
computed on the basis of a year of 365 days (or 366 days in a leap year), and in
each case shall be payable for the actual number of days elapsed (including the
first day but excluding the last day). The applicable Alternate Base Rate or
Adjusted LIBO Rate

CREDIT AGREEMENT - Page 36
<PAGE>

shall be determined by the Administrative Agent, and such determination shall be
conclusive absent manifest error.

     Section 2.12  Alternate Rate of Interest. If prior to the commencement of
                   --------------------------
any Interest Period for a LIBOR Borrowing:

     (a)   the Administrative Agent determines (which determination shall be
conclusive absent manifest error) that adequate and reasonable means do not
exist for ascertaining the Adjusted LIBO Rate for such Interest Period; or

     (b)   the Administrative Agent is advised by a majority in interest of the
Lenders participating in such Borrowing that the Adjusted LIBO Rate for such
Interest Period will not adequately and fairly reflect the cost to such Lenders
of making or maintaining their Loans included in such Borrowing for such
Interest Period;

then the Administrative Agent shall give notice thereof to the Borrower and the
Lenders by telephone or telecopy as promptly as practicable thereafter and,
until the Administrative Agent notifies the Borrower and the Lenders that the
circumstances giving rise to such notice no longer exist, (i) any Interest
Election Request that requests the conversion of any Borrowing to, or
continuation of any Borrowing as, a LIBOR Borrowing shall be ineffective and
(ii) if any Borrowing Request requests a LIBOR Borrowing, such Borrowing shall
be made as an ABR Borrowing.

     Section 2.13  Increased Costs.
                   ---------------

     (a)   If any Change in Law shall:

     (i)   impose, modify or deem applicable any reserve, special deposit or
similar requirement against assets of, deposits with or for the account of, or
credit extended by, any Lender (except any such reserve requirement reflected in
the Adjusted LIBO Rate); or

     (ii)  impose on any Lender or the London interbank market any other
condition affecting this Agreement or LIBOR Loans made by such Lender; and the
result of any of the foregoing shall be to increase the cost to such Lender of
making or maintaining any LIBOR Loan (or of maintaining its obligation to make
any such Loan) or to reduce the amount of any sum received or receivable by such
Lender hereunder (whether of principal, interest or otherwise), then the
Borrower will pay to such Lender such additional amount or amounts as will
compensate such Lender for such additional costs incurred or reduction suffered.

     (b)   If any Lender determines that any Change in Law regarding capital
requirements has or would have the effect of reducing the rate of return on such
Lender's capital or on the capital of such Lender's holding company, if any, as
a consequence of this Agreement or the Loans made by such Lender to a level
below that which such Lender or such Lender's holding company could have
achieved but for such Change in Law (taking into consideration such Lender's
policies and the policies of such Lender's holding company with respect to
capital adequacy), then from time to time the Borrower will pay to such Lender
such additional amount or amounts as will compensate such Lender or such
Lender's holding company for any such reduction suffered.

CREDIT AGREEMENT - Page 37
<PAGE>

     (c)   A certificate of a Lender setting forth the amount or amounts
necessary to compensate such Lender or its holding company, as the case may be,
as specified in paragraph (a) or (b) of this Section shall be delivered to the
                -------------    ---
Borrower and shall be conclusive absent manifest error.  The Borrower shall pay
such Lender the amount shown as due on any such certificate within 10 days after
receipt thereof.

     (d)   Failure or delay on the part of any Lender to demand compensation
pursuant to this Section shall not constitute a waiver of such Lender's right to
demand such compensation; provided that the Borrower shall not be required to
                          --------
compensate a Lender pursuant to this Section for any increased costs or
reductions incurred more than 180 days prior to the date that such Lender
notifies the Borrower of the Change in Law giving rise to such increased costs
or reductions and of such Lender's intention to claim compensation therefor;
provided further that, if the Change in Law giving rise to such increased costs
or reductions is retroactive, then the 180-day period referred to above shall be
extended to include the period of retroactive effect thereof.

     Section 2.14  Break Funding Payments. In the event of (a) the payment of
                   ----------------------
any principal of any LIBOR Loan other than on the last day of an Interest Period
applicable thereto (including as a result of an Event of Default), (b) the
conversion of any LIBOR Loan other than on the last day of the Interest Period
applicable thereto, (c) the failure to borrow, convert, continue or prepay any
Loan on the date specified in any notice delivered pursuant hereto, or (d) the
assignment of any LIBOR Loan other than on the last day of the Interest Period
applicable thereto as a result of a request by the Borrower pursuant to Section
                                                                        -------
2.17, then, in any such event, the Borrower shall compensate each Lender for the
----
loss, cost and expense attributable to such event.  In the case of a LIBOR Loan,
such loss, cost or expense to any Lender shall be deemed to include an amount
determined by such Lender to be the excess, if any, of (i) the amount of
interest which would have accrued on the principal amount of such Loan had such
event not occurred, at the Adjusted LIBO Rate that would have been applicable to
such Loan, for the period from the date of such event to the last day of the
then current Interest Period therefor (or, in the case of a failure to borrow,
convert or continue, for the period that would have been the Interest Period for
such Loan), over (ii) the amount of interest which would accrue on such
principal amount for such period at the interest rate which such Lender would
bid were it to bid, at the commencement of such period, for dollar deposits of a
comparable amount and period from other banks in the eurodollar market.  A
certificate of any Lender setting forth any amount or amounts that such Lender
is entitled to receive pursuant to this Section shall be delivered to the
Borrower and shall be conclusive absent manifest error.  The Borrower shall pay
such Lender the amount shown as due on any such certificate within 10 days after
receipt thereof.

     Section 2.15  Taxes.
                   -----

     (a)   Any and all payments by or on account of any obligation of the
Borrower hereunder or under any other Loan Document shall be made free and clear
of and without deduction for any Indemnified Taxes or Other Taxes; provided that
if the Borrower shall be required to deduct any Indemnified Taxes or Other Taxes
from such payments, then (i) the sum payable shall be increased as necessary so
that after making all required deductions (including deductions applicable to
additional sums payable under this Section) the Administrative Agent or Lender
receives an amount equal to the sum it would have received had no such
deductions been made, (ii) the Borrower shall

CREDIT AGREEMENT - Page 38
<PAGE>

make such deductions and (iii) the Borrower shall pay the full amount deducted
to the relevant Governmental Authority in accordance with applicable law.

     (b)   In addition, the Borrower shall pay any Other Taxes to the relevant
Governmental Authority in accordance with applicable law.

     (c)   The Borrower shall indemnify the Administrative Agent and each
Lender, within 10 days after written demand therefor, for the full amount of any
Indemnified Taxes or Other Taxes paid by the Administrative Agent or such Lender
on or with respect to any payment by or on account of any obligation of the
Borrower hereunder or under any other Loan Document (including Indemnified Taxes
or Other Taxes imposed or asserted on or attributable to amounts payable under
this Section) and any penalties, interest and reasonable expenses arising
therefrom or with respect thereto, whether or not such Indemnified Taxes or
Other Taxes were correctly or legally imposed or asserted by the relevant
Governmental Authority. A certificate as to the amount of such payment or
liability delivered to the Borrower by a Lender, or by the Administrative Agent
on its own behalf or on behalf of a Lender, shall be conclusive absent manifest
error.

     (d)   As soon as practicable after any payment of Indemnified Taxes or
Other Taxes by the Borrower to a Governmental Authority, the Borrower shall
deliver to the Administrative Agent the original or a certified copy of a
receipt issued by such Governmental Authority evidencing such payment, a copy of
the return reporting such payment or other evidence of such payment reasonably
satisfactory to the Administrative Agent.

     (e)   Any Foreign Lender that is entitled to an exemption from or reduction
of withholding tax under the law of the United States of America, or any treaty
to which the United States of America is a party, with respect to payments under
this Agreement shall deliver to the Borrower (with a copy to the Administrative
Agent), at the time or times prescribed by applicable law, such properly
completed and executed documentation prescribed by applicable law or reasonably
requested by the Borrower as will permit such payments to be made without
withholding or at a reduced rate; provided that such Foreign Lender has received
                                  --------
written notice from the Borrower advising it of the availability of such
exemption or reduction and supplying all applicable documentation.

     Section 2.16  Payments Generally; Pro Rata Treatment; Sharing of Set-Offs.
                   -----------------------------------------------------------

     (a)   The Borrower shall make each payment required to be made by it
hereunder or under any other Loan Document (whether of principal, interest or
fees, or of amounts payable under Section 2.13, 2.14 or 2.15, or otherwise)
                                  ------------  ----    ----
prior to 12:00 (noon), New York City time, on the date when due, in immediately
available funds, without set-off or counterclaim.  Any amounts received after
such time on any date may, in the discretion of the Administrative Agent, be
deemed to have been received on the next succeeding Business Day for purposes of
calculating interest thereon. All such payments shall be made to the
Administrative Agent for the account of Nortel Networks at Bank One, Chicago,
Illinois, ABA no. 071000013, account no. 5107520 (or such other account in New
York, New York as the Administrative Agent shall from time to time specify by
notice), except that payments pursuant to Sections 2.10(b), 2.10(c), 2.13, 2.14,
                                          ----------------  -------  ----  ----
2.15 and 9.03 shall be made directly to the Persons entitled thereto and
----     ----
payments pursuant to other Loan Documents shall be made to the

CREDIT AGREEMENT - Page 39
<PAGE>

Persons specified therein. The Administrative Agent shall distribute any such
payments received by it for the account of any other Person to the appropriate
recipient promptly following receipt thereof. If any payment under any Loan
Document shall be due on a day that is not a Business Day, the date for payment
shall be extended to the next succeeding Business Day, and, in the case of any
payment accruing interest, interest thereon shall be payable for the period of
such extension. All payments under each Loan Document shall be made in dollars.

     (b)   Each repayment or prepayment of principal of the Loans hereunder, or
selection of Borrowings for repayment or prepayment, shall be made such that the
benefit of such repayment or prepayment is shared by the Lenders ratably in
accordance with the aggregate principal amount of their respective Loans then
outstanding.

     (c)   If at any time insufficient funds are received by and available to
the Administrative Agent to pay fully all amounts of principal, interest and
fees then due hereunder, such funds shall be applied (i) first, towards payment
of interest and fees then due hereunder, ratably among the parties entitled
thereto in accordance with the amounts of interest and fees then due to such
parties, and (ii) second, towards payment of principal then due hereunder,
ratably among the parties entitled thereto in accordance with the amounts of
principal then due to such parties.

     (d)   If any Lender shall, by exercising any right of set-off or
counterclaim or otherwise, obtain payment in respect of any principal of or
interest on any of its Loans resulting in such Lender receiving payment of a
greater proportion of the aggregate amount of its Loans and accrued interest
thereon than the proportion received by any other Lender, then the Lender
receiving such greater proportion shall purchase (for cash at face value)
participations in the Loans of other Lenders to the extent necessary so that the
benefit of all such payments shall be shared by the Lenders ratably in
accordance with the aggregate amount of principal of and accrued interest on
their respective Loans; provided that (i) if any such participations are
                        --------
purchased and all or any portion of the payment giving rise thereto is
recovered, such participations shall be rescinded and the purchase price
restored to the extent of such recovery, without interest, and (ii) the
provisions of this paragraph shall not be construed to apply to any payment made
by the Borrower pursuant to and in accordance with the express terms of this
Agreement or any payment obtained by a Lender as consideration for the
assignment of or sale of a participation in any of its Loans to any assignee or
participant, other than to the Borrower or any Subsidiary or Affiliate thereof
(as to which the provisions of this paragraph shall apply). The Borrower
consents to the foregoing and agrees, to the extent it may effectively do so
under applicable law, that any Lender acquiring a participation pursuant to the
foregoing arrangements may exercise against the Borrower rights of set-off and
counterclaim with respect to such participation as fully as if such Lender were
a direct creditor of the Borrower in the amount of such participation.

     (e)   Unless the Administrative Agent shall have received notice from the
Borrower prior to the date on which any payment is due to the Administrative
Agent for the account of the Lenders hereunder that the Borrower will not make
such payment, the Administrative Agent may assume that the Borrower has made
such payment on such date in accordance herewith and may, in reliance upon such
assumption, distribute to the Lenders the amount due.  In such event, if the
Borrower has not in fact made such payment, then each of the Lenders severally
agrees to repay to the Administrative Agent forthwith on demand the amount so
distributed to such Lender with interest thereon, for each

CREDIT AGREEMENT - Page 40
<PAGE>

day from and including the date such amount is distributed to it to but
excluding the date of payment to the Administrative Agent, at the greater of the
Federal Funds Effective Rate and a rate determined by the Administrative Agent
in accordance with banking industry rules on interbank compensation.

     (f)   Without limiting the generality of paragraph (a) above, the
                                              -------------
Borrower's obligations to make each payment required to be made by it hereunder
or under any other Loan Document (whether of principal, interest, fees or
otherwise) shall be absolute and unconditional and shall not be subject to any
delay, reduction, set-off, counterclaim, defense or recoupment for any reason,
including any dispute with, breach of representation or warranty by or claim
against any supplier, manufacturer, installer, vendor or distributer, including
Nortel Networks.

     Section 2.17  Mitigation Obligations; Replacement of Lenders.
                   ----------------------------------------------

     (a)   If any Lender requests compensation under Section 2.13, or if the
                                                     ------------
Borrower is required to pay any additional amount to any Lender or any
Governmental Authority for the account of any Lender pursuant to Section 2.15,
                                                                 ------------
then such Lender shall use reasonable efforts to designate a different lending
office for funding or booking its Loans hereunder or to assign its rights and
obligations hereunder to another of its offices, branches or affiliates, if, in
the judgment of such Lender, such designation or assignment (i) would eliminate
or reduce amounts payable pursuant to Section 2.13 or 2.15, as the case may be,
                                      ------------    ----
in the future and (ii) would not subject such Lender to any unreimbursed cost or
expense and would not otherwise be disadvantageous to such Lender. The Borrower
hereby agrees to pay all reasonable costs and expenses incurred by any Lender in
connection with any such designation or assignment.

     (b)   If any Lender requests compensation under Section 2.13, or if the
                                                     ------------
Borrower is required to pay any additional amount to any Lender or any
Governmental Authority for the account of any Lender pursuant to Section 2.15,
                                                                 ------------
then the Borrower may, at its sole expense and effort, upon notice to such
Lender and the Administrative Agent, require such Lender to use all reasonable
efforts to assign and delegate, without recourse (in accordance with and subject
to the restrictions contained in Section 9.04), all its interests, rights and
                                 ------------
obligations under this Agreement to an assignee that shall assume such
obligations (which assignee may be another Lender, if a Lender accepts such
assignment); provided that (i) the Borrower shall have received the prior
             --------
written consent of the Administrative Agent, which consent shall not
unreasonably be withheld, (ii) such Lender shall have received payment of an
amount equal to the outstanding principal of its Loans, accrued interest
thereon, accrued fees and all other amounts payable to it hereunder, from the
assignee (to the extent of such outstanding principal and accrued interest and
fees) or the Borrower (in the case of all other amounts) and (iii) such
assignment will result in a material reduction in such compensation or payments.
A Lender shall not be required to make any such assignment and delegation if,
prior thereto, as a result of a waiver by such Lender or otherwise, the
circumstances entitling the Borrower to require such assignment and delegation
cease to apply.

                                 ARTICLE III

                        Representations and Warranties
                        ------------------------------

CREDIT AGREEMENT - Page 41
<PAGE>

     Each of Holdings and the Borrower represents and warrants to the
Administrative Agent and the Lenders that, as of the Effective Date and on and
as of the date of each Borrowing:

     Section 3.01  Organization; Powers.  Each of the Loan Parties is duly
                   --------------------
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization, has all requisite power and authority to carry
on its business as now conducted and, except where the failure to do so,
individually or in the aggregate, could not reasonably be expected to result in
a Material Adverse Effect, is qualified to do business in, and is in good
standing in, every jurisdiction where such qualification is required.

     Section 3.02  Authorization; Enforceability. The Transactions entered into
                   -----------------------------
or to be entered into by each Loan Party are within such Loan Party's powers and
have been duly authorized by all necessary corporate and, if required,
stockholder action. This Agreement has been duly executed and delivered by
Holdings and the Borrower and constitutes, and each other Loan Document to which
any Loan Party is or is to be a party constitutes (or, when executed and
delivered by it, will constitute) a legal, valid and binding obligation of
Holdings and the Borrower or such Loan Party (as the case may be), enforceable
in accordance with its terms, subject to applicable bankruptcy, insolvency,
reorganization, moratorium or other laws affecting creditors' rights generally
and subject to general principles of equity, regardless of whether considered in
a proceeding in equity or at law.

     Section 3.03  Governmental Approvals; No Conflicts. The Transactions (a) do
                   ------------------------------------
not require any consent or approval of, registration or filing with, or any
other action by, any Governmental Authority, except such as have been obtained
or made and are in full force and effect and except filings necessary to perfect
Liens created under the Security Documents, (b) will not violate any applicable
law or regulation or the charter, by-laws or other organizational documents of
any Loan Party or any order of any Governmental Authority, (c) will not violate
or result in a default under any indenture, agreement or other instrument
binding upon any Loan Party or its assets (including, without limitation, any
documents or agreements governing the Lucent Loan Indebtedness), or give rise to
a right thereunder to require any payment to be made by any Loan Party, and (d)
will not result in the creation or imposition of any Lien on any asset of any
Loan Party, except Liens created under the Security Documents.

     Section 3.04  Financial Condition; No Material Adverse Change.
                   -----------------------------------------------

     (a)   The Parent has heretofore furnished to the Lenders its consolidated
balance sheet and statements of income, stockholders equity and cash flows (i)
as of and for the fiscal year ended August 31, 1999, reported on by
PricewaterhouseCoopers LLP, independent public accountants, and (ii) as of and
for the fiscal quarter and the portion of the fiscal year ended February 29,
2000, certified by its chief financial officer.  Such financial statements
present fairly, in all material respects, the financial position and results of
operations and cash flows of the Parent and its consolidated subsidiaries as of
such dates and for such periods in accordance with GAAP, subject to year-end
audit adjustments and the absence of footnotes in the case of the statements
referred to in clause (ii) above.
               -----------

     (b)   The Borrower has heretofore furnished to the Lenders its consolidated
balance sheet and statement of operations, stockholder's equity and cash flows
as of and for the fiscal year ended

CREDIT AGREEMENT - Page 42
<PAGE>

August 31, 1999, and as of and for the six-month period ended June 30, 2000,
certified by its chief financial officer. Such financial statements present
fairly, in all material respects, the financial position and results of
operations and cash flows of the Borrower and its consolidated subsidiaries as
of such dates and for such periods in accordance with GAAP.

     (c)   Since June 30, 2000, there has been no material adverse change in the
business, assets, operations, prospects or condition (financial or otherwise) of
the Borrower and the Subsidiary Loan Parties, taken as a whole.

     Section 3.05  Properties and Licenses.
                   -----------------------

     (a)   Each of the Borrower and the Subsidiary Loan Parties has good title
to, or valid leasehold interests in, all the real and personal property material
to its business (other than licenses, which are addressed in paragraph (d) of
                                                             -------------
this Section), except for minor defects in title that do not interfere with its
ability to conduct its business as currently conducted or proposed to be
conducted.

     (b)   Each of the Borrower and the Subsidiary Loan Parties owns, or is
licensed to use, all trademarks, tradenames, copyrights, patents and other
intellectual property material to its business, and the use thereof by the
Borrower and the Subsidiary Loan Parties does not infringe upon the rights of
any other Person, except for any such infringements that, individually or in the
aggregate, could not reasonably be expected to result in a Material Adverse
Effect.

     (c)   Schedule 3.05A sets forth the address of each real property that is
           --------------
owned or leased by the Borrower or any of its Subsidiaries as of the date of
this Agreement after giving effect to the Transactions; provided, however, that
                                                        --------  -------
such Schedule is required to disclose only leased properties which constitute
MSC switch locations and leased properties whereat personal property or fixtures
having an aggregate value of $1,000,000 or more are located.  As of the
Effective Date, neither Holdings, the Borrower nor any of its Subsidiaries has
received notice of, or has knowledge of, any pending or contemplated
condemnation proceeding affecting any Mortgaged Property or any sale or
disposition thereof in lieu of condemnation.  Neither any Mortgaged Property nor
any interest therein is subject to any right of first refusal, option or other
contractual right to purchase such Mortgaged Property or interest therein.

     (d)   Schedule 3.05B sets forth all FCC Licenses existing as of the date of
           --------------
this Agreement (and the respective holders of such FCC Licenses) and all other
licenses and permits in effect as of the date of this Agreement that are
material to the business of the Borrower and the Subsidiary Loan Parties. Each
of the FCC Licenses, and each other license or permit that is material to the
business of the Borrower and the Subsidiary Loan Parties, is valid and in full
force and effect, and the Borrower and the Subsidiary Loan Parties are in
compliance with the terms and conditions thereof except where the failure to so
comply could not, individually or in the aggregate, reasonably be expected to
result in a Material Adverse Effect.  The Borrower has the right to utilize all
FCC Licenses held by the License Subsidiaries.

CREDIT AGREEMENT - Page 43
<PAGE>

     Section 3.06  Litigation and Environmental Matters.
                   ------------------------------------

     (a)   There are no actions, suits or proceedings by or before any
arbitrator or Governmental Authority pending against or, to the knowledge of
Holdings or the Borrower, threatened against or affecting any Loan Party (i) as
to which there is a reasonable possibility of an adverse determination and that,
if adversely determined, could reasonably be expected, individually or in the
aggregate, to result in a Material Adverse Effect (other than the Disclosed
Matters) or (ii) that involve any of the Loan Documents or the Transactions.

     (b)   Except for the Disclosed Matters and except with respect to any other
matters that, individually or in the aggregate, could not reasonably be expected
to result in a Material Adverse Effect, none of the Loan Parties (i) has failed
to comply with any Environmental Law or to obtain, maintain or comply with any
permit, license or other approval required under any Environmental Law, (ii) has
become subject to any Environmental Liability, (iii) has received notice of any
claim with respect to any Environmental Liability or (iv) knows of any basis for
any Environmental Liability.

     (c)   Since the date of this Agreement, there has been no change in the
status of the Disclosed Matters that, individually or in the aggregate, has
resulted in, or materially increased the likelihood of, a Material Adverse
Effect.

     Section 3.07  Compliance with Laws and Agreements.  Each of the Loan
                   -----------------------------------
Parties is in compliance with all laws, regulations and orders of any
Governmental Authority applicable to it or its property and all indentures,
agreements and other instruments binding upon it or its property (including,
without limitation, all agreements, instruments or documents governing the
Lucent Loan Indebtedness or any other Eligible Secured Debt), except where the
failure to do so, individually or in the aggregate, could not reasonably be
expected to result in a Material Adverse Effect.  No Default has occurred and is
continuing.

     Section 3.08  Investment and Holding Company Status.  None of the Loan
                   -------------------------------------
Parties is (a) an "investment company" as defined in, or subject to regulation
under, the Investment Company Act of 1940 or (b) a "holding company" or a
"subsidiary company" of a "holding company" or an "affiliate" of a "holding
company" or a "public utility" as defined in, or subject to regulation under,
the Public Utility Holding Company Act of 1935, as amended.

     Section 3.09  Taxes. Each of the Loan Parties has timely filed or caused to
                   -----
be filed all Tax returns and reports required to have been filed and has paid or
caused to be paid all Taxes required to have been paid by it, except (a) Taxes
that are being contested in good faith by appropriate proceedings and for which
the applicable Loan Party has set aside on its books adequate reserves or (b)
the filing of state or local Tax returns and reports, or the payment of state or
local Taxes, to the extent that the failure to do so, individually or in the
aggregate, could not reasonably be expected to result in a Material Adverse
Effect.

     Section 3.10  ERISA.  No ERISA Event has occurred or is reasonably expected
                   -----
to occur that, when taken together with all other such ERISA Events for which
liability is reasonably expected to occur, could reasonably be expected to
result in a Material Adverse Effect. The present

CREDIT AGREEMENT - Page 44
<PAGE>

value of all accumulated benefit obligations under each Plan (based on the
assumptions used for purposes of Statement of Financial Accounting Standards No.
87) did not, as of the date of the most recent financial statements reflecting
such amounts, exceed by more than $1,000,000 the fair market value of the assets
of such Plan, and the present value of all accumulated benefit obligations of
all underfunded Plans (based on the assumptions used for purposes of Statement
of Financial Accounting Standards No. 87) did not, as of the date of the most
recent financial statements reflecting such amounts, exceed by more than
$5,000,000 the fair market value of the assets of all such underfunded Plans.

     Section 3.11  Disclosure. Holdings and the Borrower have disclosed to the
                   ----------
Lenders all agreements, instruments and corporate or other restrictions to which
any of the Loan Parties is subject, and all other matters known to any of them,
that, individually or in the aggregate, could reasonably be expected to result
in a Material Adverse Effect. None of the reports, financial statements,
certificates or other information furnished by or on behalf of any Loan Party to
the Administrative Agent or any Lender in connection with the negotiation of
this Agreement or any other Loan Document or delivered hereunder or thereunder
(as modified or supplemented by other information so furnished) contains any
material misstatement of fact or omits to state any material fact necessary to
make the statements therein, in the light of the circumstances under which they
were made, not misleading; provided that, with respect to projected financial
                           --------
information, Holdings and the Borrower represent only that such information was
prepared in good faith based upon assumptions believed to be reasonable at the
time.

     Section 3.12  Subsidiaries.  Holdings does not have any subsidiaries other
                   ------------
than the Borrower and the Borrower's Subsidiaries. Schedule 3.12 sets forth as
                                                   -------------
of the Effective Date (a) the name of, and the ownership interest of the
Borrower in, each Subsidiary of the Borrower and (b) the name of, and the
ownership interest of the Parent in, each License Subsidiary.

     Section 3.13  Insurance.  Schedule 3.13 sets forth a description of all
                   ---------   -------------
insurance maintained by or on behalf of the Borrower and the Subsidiary Loan
Parties as of the Effective Date.  As of the Effective Date, all premiums then
due and payable in respect of such insurance have been paid.

     Section 3.14  Labor Matters.  As of the Effective Date, there are no
                   -------------
strikes, lockouts or slowdowns against any Loan Party pending or, to the
knowledge of Holdings or the Borrower, threatened. The hours worked by and
payments made to employees of the Loan Parties have not been in violation of the
Fair Labor Standards Act or any other applicable Federal, state, local or
foreign law dealing with such matters.  All payments due from any Loan Party, or
for which any claim may be made against any Loan Party, on account of wages and
employee health and welfare insurance and other benefits, have been paid or
accrued as a liability on the books of the applicable Loan Party. The
consummation of the Transactions will not give rise to any right of termination
or right of renegotiation on the part of any union under any collective
bargaining agreement to which any Loan Party is bound.

     Section 3.15  Purchase Agreement.  The Purchase Agreement is in full force
                   ------------------
and effect. The Borrower is in compliance in all material respects with the
terms and conditions of the Purchase Agreement.

CREDIT AGREEMENT - Page 45
<PAGE>

     Section 3.16  Year 2000.  Any reprogramming required to permit the proper
                   ---------
functioning, in and following the year 2000, of (a) the computer systems of the
Borrower and its Subsidiaries (including any computer systems of the Parent that
are used in connection with the business of the Borrower and its Subsidiaries)
and (b) equipment containing embedded microchips (including systems and
equipment supplied by others or with which the Borrower's systems interface) and
the testing of all such systems and equipment, as so reprogrammed, have been
completed.  The cost to the Borrower and its Subsidiaries of such reprogramming
and testing and of the reasonably foreseeable consequences of year 2000 to the
Borrower and its Subsidiaries (including reprogramming errors and the failure of
others' systems or equipment) will not result in a Default or a Material Adverse
Effect.

     Section 3.17  Certain Matters Relating to ChaseTel.
                   ------------------------------------

     (a)   The ChaseTel Acquisition has been consummated in compliance with
Section 6.04 of the Lucent Credit Agreement and in all material respects in
accordance with the ChaseTel Purchase Agreement, and, as a result, no "Loans"
(as such term is defined in the Lucent Credit Agreement) constitute "ChaseTel
Loans" (as such term is defined in the Lucent Credit Agreement).

     (b)   The ChaseTel Credit Agreement has been terminated and all ChaseTel
Indebtedness existing on March 17, 2000 (including all ChaseTel Indebtedness
arising under the ChaseTel Credit Agreement) has been paid or forgiven in full;
provided, however, that the ChaseTel Earnout remains unpaid and is payable in
--------  -------
accordance with the ChaseTel Purchase Agreement.  The maximum amount of the
ChaseTel Earnout is the sum of $41,000,000 plus the aggregate amount of the
                                           ----
legal fees, accounting fees and severance payments to employees as provided in
the ChaseTel Purchase Agreement.

     (c)   All Indebtedness of ChaseTel constituting the "Permitted ChaseTel
Financing," as such term is defined in the Lucent Credit Agreement, has been
paid or forgiven in full.

     (d)   All Liens securing any of the Indebtedness of ChaseTel referred to in
this Section 3.17 have been fully released.
     ------------

     Section 3.18  Other Credit Agreements.  A true, correct and complete
                   -----------------------
photocopy of the Lucent Credit Agreement, each other loan, credit or similar
agreement relating to any other Eligible Secured Debt and all other agreements,
instruments or documents of a material nature relating to any of the foregoing
(other than purchase agreements and supply agreements and agreements, documents,
instruments and certificates executed and/or delivered pursuant thereto)
(collectively, the "Other Loan Documents") has been previously delivered to the
                    --------------------
Administrative Agent.

     Section 3.19  Eligible Secured Debt.  The Loans made and contemplated to be
                   ---------------------
made in accordance with this Agreement constitute a part of the "Obligations",
as such term is defined in the Collateral Agency Agreement, and are permitted to
be secured by all Collateral in accordance with the Collateral Agency Agreement.

CREDIT AGREEMENT - Page 46
<PAGE>

                                  ARTICLE IV

                                  Conditions
                                  ----------

     Section 4.01  Effective Date.  This Agreement (including, without
                   --------------
limitation, the obligations of the Lenders to make Loans hereunder) shall not
become effective until the date on which each of the following conditions is
satisfied (or waived in accordance with Section 9.02):
                                        ------------

     (a)   The Administrative Agent (or its counsel) shall have received from
each party hereto either (i) a counterpart of this Agreement signed on behalf of
such party or (ii) written evidence satisfactory to the Administrative Agent
(which may include telecopy transmission of a signed signature page of this
Agreement) that such party has signed a counterpart of this Agreement.

     (b)   The Lenders shall be satisfied with the corporate and legal structure
and capitalization of Holdings, the Borrower and the Subsidiary Loan Parties,
including the charter and by-laws of Holdings, the Borrower and each Subsidiary
Loan Party and each agreement or instrument evidencing Indebtedness.

     (c)   All Equipment Site Interests (if any) shall be owned by Real Estate
Subsidiaries in accordance with Section 6.12.  Each FCC License shall be owned
                                ------------
by a License Subsidiary in accordance with Section 6.13.  No event shall have
                                           ------------
occurred that would subject any FCC License to revocation by the FCC.

     (d)   The Purchase Agreement shall have been executed and delivered by the
Borrower and Nortel Networks and shall be in full force and effect.

     (e)   The Borrower and the Administrative Agent shall have received waivers
relating to this Agreement from Lucent under Sections 6.08 and 6.22 of the
Lucent Credit Agreement, which waivers shall be in form and substance reasonably
satisfactory to the Administrative Agent.

     (f)   The Administrative Agent shall have received a favorable written
opinion or opinions (addressed to the Agents and the Lenders and dated the
Effective Date) of one or more counsel for the Loan Parties reasonably
satisfactory to the Administrative Agent, which opinion or opinions shall be in
form and substance reasonably satisfactory to the Administrative Agent and shall
cover such matters relating to the Loan Parties, the Loan Documents or the
Transactions as the Administrative Agent shall reasonably request.  Holdings and
the Borrower hereby request their counsel referred to in this paragraph to
deliver such opinions.

The Administrative Agent shall notify the Borrower and the Lenders of the
Effective Date (if and when such date occurs), and such notice shall be
conclusive and binding.

     Section 4.02  Initial Availability Date. The obligations of the Lenders to
                   -------------------------
make Loans hereunder on the occasion of the first Borrowing hereunder shall be
subject to the occurrence of the Effective Date and the satisfaction (or waiver
in accordance with Section 9.02) of the following additional conditions:
                   ------------

CREDIT AGREEMENT - Page 47
<PAGE>

     (a)   [Reserved];

     (b)   The Administrative Agent shall have received such documents and
certificates as the Administrative Agent or its counsel may reasonably request
relating to the organization, existence and good standing of the Loan Parties,
the authorization of the Transactions and any other legal matters relating to
the Loan Parties, the Loan Documents or the Transactions, all in form and
substance satisfactory to the Administrative Agent and its counsel.

     (c)   The Administrative Agent shall have received a certificate, dated the
Effective Date and signed by the President, a Vice President or a Financial
Officer of the Borrower, confirming compliance with the conditions set forth in
paragraphs (a) and (b) of Section 4.04.
--------------     ---    ------------

     (d)   The Agents and Nortel Networks shall have received all fees and other
amounts due and payable to them hereunder on or prior to the Initial
Availability Date, including, to the extent invoiced, reimbursement or payment
of all expenses required to be reimbursed or paid by the Borrower hereunder or
under any other Loan Document.

     (e)   The Collateral and Guarantee Requirement shall have been satisfied
and the Agents shall have received a completed Perfection Certificate dated the
Effective Date and signed by a Financial Officer of the Borrower, together with
all attachments contemplated thereby, including (i) the results of a search of
the Uniform Commercial Code (or equivalent) filings made with respect to the
Borrower and the Subsidiary Loan Parties in the jurisdictions contemplated by
the Perfection Certificate and (ii) copies of the financing statements (or
similar documents) disclosed by such search and evidence reasonably satisfactory
to the Agents that the Liens indicated by such financing statements (or similar
documents) are permitted by Section 6.02 or have been released.
                            ------------

     (f)   The Administrative Agent shall have received evidence satisfactory to
it that (i) the insurance required by Section 5.07 is in effect, (ii) that the
                                      ------------
Collateral Agent has been named as an additional insured and loss payee under
all insurance policies to be maintained with respect to the properties of the
Borrower and the Subsidiary Loan Parties constituting the Collateral and (iii)
the Administrative Agent has been named as loss payee under all such liability
insurance policies required to be so maintained.

     (g)   The Collateral Agent shall have received a counterpart of the
Subordination Agreement duly executed and delivered on behalf of each Loan
Party.

     (h)   The Lenders shall have received a permit issued by the California
Department of Corporations pursuant to Section 25113 of the California
Corporation Code exempting the Loans from California usury laws without
condition or qualification except as may be reasonably acceptable to the
Lenders, or, if such permit is not issued, the Lenders shall be reasonably
satisfied that California usury laws shall not be applicable to the Loans.

     (i)   The Parent shall have obtained all consents, waivers and amendments
required under all agreements and documents governing the Lucent Loan
Indebtedness and in connection with the Transactions, in each case on terms
reasonably satisfactory to the Lenders.

CREDIT AGREEMENT - Page 48
<PAGE>

     (j)   The Lucent Credit Agreement shall have been amended such that (i)
clause (i) of the proviso of the definition of the term "Eligible Secured Debt"
therein shall be identical to clause (i) of the proviso of the definition of the
                              ----------
term "Eligible Secured Debt" contained herein, (ii) the final proviso contained
in the definition of the term "Permitted Third Party Payments" therein shall be
substantively identical to the proviso contained in the definition of the term
"Permitted Third Party Payments" contained herein, (iii) the definition of the
term "Subscribers" therein shall be identical to the definition of the term
"Subscribers" contained herein, (iv) Section 6.15 thereof shall be identical to
Section 6.15 hereof, and (v) the second sentence of Section 6.22 thereof shall
------------
be substantively identical to the second sentence of Section 6.22 hereof, and
                                                     ------------
Section 8(b) of the Parent Agreement dated as of November 24, 1999 between the
Parent and Lucent shall have been amended to be substantively identical to
Section 1(b) of the Parent Agreement.

CREDIT AGREEMENT - Page 49

<PAGE>

     (k)   The Collateral Agent shall have received control agreements in form
and substance reasonably satisfactory to the Administrative Agent pursuant to
which the Collateral Agent's Lien in and to the securities accounts of the
Borrower having an aggregate value of approximately $380,000,000 (as of August
24, 2000) shall have been perfected.

     (l)   Each of (i) the Collateral Agency Agreement in the form of Exhibit B
                                                                      ---------
hereto, (ii) the amendment to the Indemnity, Subrogation and Contribution
Agreement included as part of Exhibit C hereto, (iii) the Parent Agreement in
                              ---------
the form of Exhibit D hereto, (iv) the Parent Guarantee in the form of Exhibit E
            ---------                                                  ---------
hereto, and (v) the amendment to the Subordination Agreement included as a part
of Exhibit G hereto, shall have been executed and delivered by all parties
   ---------
thereto.

Notwithstanding the foregoing, the Lenders shall not be required to make Loans
hereunder unless each of the foregoing conditions is satisfied (or waived
pursuant to Section 9.02) at or prior to 3:00 p.m., New York City time, on
            ------------
October 30, 2000 (and, in the event such conditions are not so satisfied or
waived, the Commitments shall terminate at such time).

     Section 4.03  [Reserved]

     Section 4.04  Each Borrowing. The obligation of each Lender to make a Loan
                   --------------
on the occasion of any Borrowing is subject to the satisfaction of the following
conditions:

     (a)   At the time of and immediately after giving effect to such Borrowing,
the representations and warranties of the Loan Parties set forth in the Loan
Documents shall be true and correct on and as of the date of such Borrowing.

     (b)   At the time of and immediately after giving effect to such Borrowing,
no Default shall have occurred and be continuing.

     (c)   At the time of and immediately after giving effect to such Borrowing,
(i) the aggregate principal amount of all Loans made hereunder (whether or not
repaid) shall not exceed [*] of the sum of the aggregate Purchase Price payments
made to Nortel Networks at or prior to such time, (ii) the ratio of Total
Indebtedness to Total Contributed Capital shall not exceed 2.0 to 1.0 and (iii)
the aggregate principal amount (without duplication) of all Loans advanced after
giving effect to such Borrowing and all other Eligible Secured Debt described in
clauses (a), (b) and (c) of the definition of "Eligible Secured Debt" that has
-----------  ---     ---                       ---------------------
been incurred (on a cumulative basis, whether or not such Eligible Secured Debt
remains outstanding) shall not exceed $1,845,000,000.

     (d)   In the case of a Borrowing to finance the Purchase Price of any
assets, a License Subsidiary shall have a valid FCC License for the geographic
market in which such assets are to be installed or operated. Each Borrowing
shall be deemed to constitute a representation and warranty by the Borrower on
the date thereof as to the matters specified in paragraphs (a), (b), (c) and (d)
                                                --------------  ---  ---     ---
of this Section.

CREDIT AGREEMENT - Page 50

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

                                   ARTICLE V

                             Affirmative Covenants
                             ---------------------

     Until the Commitments have expired or been terminated and the principal of
and interest on each Loan and all fees payable hereunder shall have been paid in
full, each of Holdings and the Borrower covenants and agrees with the Lenders
that:

     Section 5.01  Financial Statements and Other Information. The Borrower will
                   ------------------------------------------
furnish to the Administrative Agent and each Lender:

     (a)   within 90 days after the end of each fiscal year of the Borrower (A)
the audited consolidated balance sheets of each of the Parent and its
subsidiaries and of the Borrower and its Subsidiaries, respectively, and their
respective related statements of operations, stockholders' equity and cash flows
as of the end of and for such year, setting forth in each case in comparative
form the figures for the previous fiscal year all reported on by
PricewaterhouseCoopers LLP or other independent public accountants of recognized
national standing (without a "going concern" or like qualification or exception
and without any qualification or exception as to the scope of such audit) to the
effect that such consolidated financial statements present fairly in all
material respects the financial condition and results of operations of each of
the Parent and its subsidiaries and of the Borrower and its Subsidiaries,
respectively, in each case on a consolidated basis in accordance with GAAP
consistently applied and (B) a combined consolidated balance sheet of the
Borrower and the Subsidiary Loan Parties and related statements of operations,
stockholders' equity and cash flows, for the same period as (and prepared based
on) the financial statements referred to in clause (A) above, consolidated as
though all the License Subsidiaries were subsidiaries of the Borrower, and
prepared by the same firm of independent public accountants as reported on such
financial statements;

     (b)   within 45 days after the end of each of the first three fiscal
quarters of each fiscal year of the Borrower, the consolidated balance sheets of
each of the Parent and its subsidiaries and of the Borrower and its
Subsidiaries, respectively, and their respective related statements of
operations, stockholders' equity and cash flows as of the end of and for such
fiscal quarter and the then elapsed portion of the fiscal year setting forth in
each case in comparative form the figures for the corresponding period or
periods of (or, in the case of the balance sheet, as of the end of) the previous
fiscal year all certified by one of its Financial Officers as presenting fairly
in all material respects the financial condition and results of operations of
each of the Parent and its subsidiaries and of the Borrower and its
Subsidiaries, respectively, in each case on a consolidated basis in accordance
with GAAP consistently applied, subject to normal year-end audit adjustments and
the absence of footnotes and (B) a combined consolidated balance sheet of the
Borrower and the Subsidiary Loan Parties and related statements of operations,
stockholders' equity and cash flows, for the same period as (and prepared based
on) the financial statements referred to in clause (A) above, consolidated as
though all the License Subsidiaries were subsidiaries of the Borrower, and
prepared and certified by one of the Borrower's Financial Officers;

     (c)   within 30 days after the end of each fiscal month of the Borrower
(other than after the end of each fiscal quarter), the consolidated balance
sheet of the Borrower and its Subsidiaries and related statements of operations,
stockholders' equity and cash flows as of the end of and for

CREDIT AGREEMENT - Page 51
<PAGE>

such fiscal month and the then elapsed portion of the fiscal year, all certified
by one of its Financial Officers as presenting in all material respects the
financial condition and results of operations of the Borrower and its
Subsidiaries on a consolidated basis in accordance with GAAP consistently
applied, subject to normal year-end audit adjustments and the absence of
footnotes;

     (d)  concurrently with any delivery of the Borrower's financial statements
under clause (a) or (b) above, a certificate of a Financial Officer of the
Borrower (i) certifying as to whether a Default has occurred and, if a Default
has occurred, specifying the details thereof and any action taken or proposed to
be taken with respect thereto, (ii) setting forth reasonably detailed
calculations demonstrating compliance with Sections 6.15, 6.18, 6.19, 6.20 and
6.21, and (iii) stating whether any change in GAAP or in the application thereof
has occurred since the date of the Borrower's audited financial statements
referred to in Section 3.04 and, if any such change has occurred, specifying the
effect of such change on the financial statements accompanying such certificate;

     (e)  concurrently with the delivery of financial statements under clause
(a) above, a certificate of the accounting firm that reported on such financial
statements stating whether they obtained knowledge during the course of their
examination of such financial statements of any Default (which certificate may
be limited to the extent required by accounting rules or guidelines);

     (f)  promptly after the same become available but in any event within 30
days after the end of each fiscal year of the Borrower, the Business Plan for
the current fiscal year and updated financial projections through the Maturity
Date;

     (g)  promptly after the end of (i) each fiscal year of the Borrower and
(ii) each fiscal quarter a certificate signed on behalf of the Borrower by the
President, a Vice President or a Financial Officer of the Borrower, setting
forth the number of Covered POPS and the number of Subscribers as of the end of
such fiscal year;

     (h)  promptly after the same become publicly available, copies of all
periodic and other reports, proxy statements and other materials filed by any
Loan Party with the Securities and Exchange Commission, or any Governmental
Authority succeeding to any or all of the functions of said Commission, or with
any national securities exchange, or distributed by the Parent to its
shareholders generally or by Holdings to its securityholders generally, as the
case may be;

     (i)  promptly after execution thereof, copies of any agreement, instrument
or other document evidencing or governing any other Eligible Secured Debt and of
any amendment or modification thereto or waiver thereunder; and

     (j)  promptly following any request therefor, such other information
regarding the operations, business affairs and financial condition of Holdings,
the Borrower or any Subsidiary, or compliance with the terms of any Loan
Document, as either Agent or any Lender may reasonably request.

     Section 5.02  Notices of Material Events. The Borrower will furnish to the
                   --------------------------
the Administrative Agent and each Lender prompt written notice of the following:

     (a)  the occurrence of any Default;

CREDIT AGREEMENT - Page 52
<PAGE>

     (b)  the filing or commencement of any action, suit or proceeding by or
before any arbitrator or Governmental Authority against or affecting the
Borrower or any Affiliate thereof that, if adversely determined, could
reasonably be expected to result in a Material Adverse Effect;

     (c)  the occurrence of any ERISA Event that, alone or together with any
other ERISA Events that have occurred, could reasonably be expected to result in
liability of the Borrower and the Subsidiary Loan Parties in an aggregate amount
exceeding $1,000,000; and

     (d)  any other development that results in, or could reasonably be expected
to result in, a Material Adverse Effect.

Each notice delivered under this Section shall be accompanied by a statement of
a Financial Officer or other executive officer of the Borrower setting forth the
details of the event or development requiring such notice and any action taken
or proposed to be taken with respect thereto.

     Section 5.03  Information Regarding Collateral.
                   --------------------------------

     (a)  The Borrower will furnish to the Agents prompt written notice of any
change (i) in the Borrower's or any Subsidiary Loan Party's corporate name or in
any trade name used to identify it in the conduct of its business or in the
ownership of its properties, (ii) in the location of the Borrower's or any
Subsidiary Loan Party's chief executive office, its principal place of business,
any office in which it maintains books or records relating to the Collateral or
any premises where any asset constituting Collateral is installed or situated
(including the installation of any asset constituting Collateral at a location
where Collateral has not previously been located), (iii) in the Borrower's or
any Subsidiary Loan Party's identity or corporate structure or (iv) in the
Borrower's or any Subsidiary Loan Party's Federal Taxpayer Identification
Number. The Borrower agrees not to effect or permit any change referred to in
the preceding sentence unless all filings have been made under the Uniform
Commercial Code or otherwise that are required in order for the Collateral Agent
to continue at all times following such change to have a valid, legal and
perfected security interest in all the Collateral. The Borrower also agrees
promptly to notify the Agents if any material portion of the Collateral is
damaged or destroyed.

     (b)  Each year, at the time of delivery of annual financial statements for
the Borrower with respect to the preceding fiscal year pursuant to clause (a) of
                                                                   ----------
Section 5.01, the Borrower shall deliver to the Agents a certificate of a
------------
Financial Officer of the Borrower (i) setting forth the information required
pursuant to Section 2 of the Perfection Certificate or confirming that there has
been no change in such information since the date of the Perfection Certificate
delivered on the Effective Date or the date of the most recent certificate
delivered pursuant to this Section and (ii) certifying that all Uniform
Commercial Code financing statements (including fixture filings, as applicable)
or other appropriate filings, recordings or registrations, including all
refilings, rerecordings and reregistrations, containing a description of the
Collateral have been filed of record in each governmental, municipal or other
appropriate office in each jurisdiction identified pursuant to clause (i) above
                                                               ----------
to the extent necessary to protect and perfect the security interests under the
Security Agreement for a period of not less than 18 months after the date of
such certificate (except as noted therein with respect to any continuation
statements to be filed within such period).

CREDIT AGREEMENT - Page 53
<PAGE>

     Section 5.04  Existence; Conduct of Business. Each of Holdings and the
                   ------------------------------
Borrower will, and will cause each of the Subsidiary Loan Parties to, do or
cause to be done all things necessary to preserve, renew and keep in full force
and effect its legal existence and the rights, licenses, permits, privileges and
franchises material to the conduct of the business of the Borrower and the
Subsidiary Loan Parties, taken as a whole; provided that the foregoing shall not
prohibit any merger, consolidation, liquidation or dissolution permitted under
Section 6.03.
-------------

     Section 5.05  Payment of Obligations.  Each of Holdings and the Borrower
                   ----------------------
will, and will cause each of the Subsidiary Loan Parties to, pay its
Indebtedness and other obligations, including Tax liabilities, before the same
shall become delinquent or in default, except where (a) the validity or amount
thereof is being contested in good faith by appropriate proceedings, (b) the
Borrower or such Subsidiary Loan Party has set aside on its books adequate
reserves with respect thereto in accordance with GAAP, (c) such contest
effectively suspends collection of the contested obligation and the enforcement
of any Lien securing such obligation and (d) the failure to make payment pending
the resolution of such contest could not reasonably be expected to result in a
Material Adverse Effect.

     Section 5.06  Maintenance of Properties. The Borrower will, and will cause
                   -------------------------
each of the Subsidiary Loan Parties to, keep and maintain all property material
to the conduct of its business in good working order and condition, ordinary
wear and tear excepted.

     Section 5.07  Insurance.
                   ---------

     (a)  The Borrower will, and will cause each of the Subsidiary Loan Parties
to, maintain, with financially sound and reputable insurance companies,
insurance in such amounts and against such risks (including fire and other risks
insured by extended coverage) as are customarily maintained by companies engaged
in the same or similar businesses operating in the same or similar locations,
including public liability insurance against claims for personal injury, death
or property damage occurring upon, about or in connection with the use of any
properties owned, occupied or controlled by it as well as such other insurance
as may be required by law.

     (b)  All policies of casualty insurance maintained by or for the benefit of
the Borrower or any Subsidiary Loan Party with respect to any of the Collateral
shall be endorsed or otherwise amended to include a "standard" or "New York"
lender's loss payable endorsement, in favor of and satisfactory to the
Collateral Agent, which endorsement shall provide that the insurance carrier
shall pay all proceeds otherwise payable to any Loan Party under such policies
directly to the Collateral Agent. All such policies also shall provide that none
of the Loan Parties, the Administrative Agent, the Collateral Agent nor any
other party shall be a coinsurer thereunder and shall contain a "Replacement
Cost Endorsement", without any deduction for depreciation, "mortgagee's
interest" and/or "breach of warranty coverage" and such other provisions as the
Administrative Agent or the Collateral Agent may reasonably require from time to
time to protect the interests of the Lenders. Each such policy also shall
provide that it shall not be canceled, modified or not renewed (i) by reason of
nonpayment of premium except upon not less than 10 days' prior written notice
thereof by the insurer to the Administrative Agent and the Collateral Agent
(giving the Administrative Agent and the Collateral Agent the right to cure
defaults in the payment of premiums) or (ii) for any other reason except upon
not less than 30 days' prior written notice thereof by the insurer to the
Administrative Agent and the Collateral Agent. The Borrower shall deliver to the
Administrative

CREDIT AGREEMENT - Page 54
<PAGE>

Agent and the Collateral Agent, prior to the cancellation, modification or
nonrenewal of any such policy of insurance, a copy of a renewal or replacement
policy (or other evidence of renewal of a policy previously delivered to the
Administrative Agent and the Collateral Agent) together with evidence
satisfactory to the Administrative Agent and the Collateral Agent of payment of
the premium therefor.

     (c)  The Borrower shall notify the Administrative Agent and the Collateral
Agent immediately whenever any separate insurance concurrent in form or
contributing in the event of loss with that required to be maintained under this
Section is taken out by any Loan Party, and shall promptly deliver to the
Administrative Agent and the Collateral Agent a duplicate original copy of such
policy or policies.

     Section 5.08  Books and Records; Inspection Rights. Each of Holdings and
                   ------------------------------------
the Borrower will, and will cause each of the Subsidiary Loan Parties to, keep
proper books of record and account in which full, true and correct entries are
made of all dealings and transactions in relation to its business and
activities.  Each of Holdings and the Borrower will, and will cause each of the
Subsidiary Loan Parties to, permit any representatives designated by either
Agent or any Lender, upon reasonable prior notice, to visit and inspect its
properties, to examine and make extracts from its books and records, and to
discuss its affairs, finances and condition with its officers and independent
accountants, all during normal business hours but as often as reasonably
requested.

     Section 5.09  Compliance with Laws and Agreements. Each of Holdings and the
                   -----------------------------------
Borrower will, and will cause each of the Subsidiary Loan Parties to, comply
with all laws, rules, regulations and orders of any Governmental Authority
(including ERISA and all Environmental Laws) applicable to it or its property
and all indentures, agreements and other instruments binding upon it or its
property, except where the failure to do so, individually or in the aggregate,
could not reasonably be expected to result in a Material Adverse Effect.

     Section 5.10  Use of Proceeds. The proceeds of the Loans will be used (a)
                   ---------------
to make payments in respect of the Purchase Price and Permitted Third Party
Payments and (b) to pay fees payable under Sections 2.10(a), 2.10(b) and
                                           ----------------  -------
2.10(c), interest payable to Nortel Networks, the Agent or the Lenders under
-------
this Agreement and out-of-pocket expenses incurred in connection with the
negotiation, execution and delivery of the Loan Documents; provided, however,
                                                           --------  -------
that the equipment, goods and/or services financed with or constituting
Permitted Third Party Payments shall be used solely in the markets which are
generally utilizing equipment provided by Nortel Networks (as opposed to markets
which are generally utilizing equipment provided by Lucent or other competitors
of Nortel Networks).

     Section 5.11  Additional Subsidiaries.  If any additional Subsidiary Loan
                   -----------------------
Party is formed or acquired after the Effective Date, the Borrower will, within
three Business Days after such Subsidiary Loan Party is formed or acquired, (a)
notify the Agents and the Lenders thereof, (b) cause the Collateral and
Guarantee Requirement to be satisfied with respect to such Subsidiary Loan Party
and with respect to any Equity Interest in or Indebtedness of such Subsidiary
Loan Party owned by or on behalf of any Loan Party and (c) cause such Subsidiary
Loan Party to become a party to the Subordination Agreement.

CREDIT AGREEMENT - Page 55
<PAGE>

     Section 5.12  Further Assurances.
                   ------------------

     (a)  Each of Holdings and the Borrower will, and will cause each Subsidiary
Loan Party to, execute any and all further documents, financing statements,
agreements and instruments, and take all such further actions (including the
filing and recording of financing statements, fixture filings, mortgages, deeds
of trust and other documents), which may be required under any applicable law,
or which either Agent or the Required Lenders may reasonably request, to cause
the Collateral and Guarantee Requirement to be and remain satisfied, all at the
expense of the Loan Parties. The Borrower also agrees to provide to the Agents,
from time to time upon request, evidence reasonably satisfactory to the Agents
as to the perfection and priority of the Liens created or intended to be created
by the Security Documents.

     (b)  If any material assets (including any real property or improvements
thereto or any interest therein, but excluding Equipment Site Interests acquired
by Real Estate Subsidiaries) are acquired by the Borrower or any Subsidiary Loan
Party after the Effective Date (other than assets constituting Collateral under
the Security Agreement that become subject to the Lien of the Security Agreement
upon acquisition thereof), the Borrower will notify the Agents and the Lenders
thereof, and, if requested by the Administrative Agent or the Required Lenders,
the Borrower will cause such assets to be subjected to a Lien securing the
Obligations and will take, and cause the Subsidiary Loan Parties to take, such
actions as shall be necessary or reasonably requested by the Administrative
Agent to grant and perfect such Liens, including actions described in paragraph
                                                                      ---------
(a) of this Section, all at the expense of the Loan Parties.
---

     (c)  Each of Holdings and the Borrower will, and will cause each Subsidiary
Loan Party to, ensure that the Loans made from time to time pursuant to this Ag
reement, and all "Permitted Refinancings" (as such term is defined in the
Collateral Agency Agreement) of such Loans, shall at all times constitute
Eligible Secured Debt and are permitted to be incurred and secured by all
Collateral in accordance with the Collateral Agency Agreement.

     Section 5.13  Casualty and Condemnation.
                   -------------------------

     (a)  The Borrower will furnish to the Agents and the Lenders prompt written
notice of any casualty or other damage to any portion of any Collateral or the
commencement of any action or proceeding for the taking of any Collateral or any
part thereof or interest therein under power of eminent domain or by
condemnation or similar proceeding.

     (b)  If any event described in paragraph (a) of this Section results in Net
                                    -------------
Proceeds (whether in the form of insurance proceeds, condemnation award or
otherwise), the Collateral Agent is authorized to collect such Net Proceeds and,
if received by the Borrower or any Subsidiary Loan Party, such Net Proceeds
shall be paid over to the Collateral Agent. All such Net Proceeds retained by or
paid over to the Collateral Agent shall be held by the Collateral Agent and
released from time to time to pay the costs of repairing, restoring or replacing
the affected property or purchasing additional property constituting Collateral
in accordance with the terms of this Agreement and the applicable provisions of
the Security Documents, subject to the provisions of the Security Documents
regarding application of such Net Proceeds during a Default.

CREDIT AGREEMENT - Page 56
<PAGE>

     (c)  If any Net Proceeds retained by or paid over to the Collateral Agent
as provided above continue to be held by the Collateral Agent on the date that
any prepayment is due pursuant to Section 2.09(b) in respect of the event
                                  ---------------
resulting in such Net Proceeds, then such Net Proceeds shall be applied to
prepay Borrowings as provided in Section 2.09(b).
                                 ---------------

     Section 5.14  Interest Rate Protection.  After the consolidated Long-Term
                   ------------------------
Indebtedness (excluding Primary Subordinated Obligations) of the Borrower and
the Subsidiary Loan Parties exceeds $225,000,000, the Borrower will from time to
time enter into and maintain in effect one or more Hedging Agreements
satisfactory to the Required Lenders, the effect of which shall be to fix or
limit the interest cost to the Borrower and the Subsidiary Loan Parties with
respect to such portion of their Long-Term Indebtedness as shall be necessary in
order that, at all times, at least 50% of consolidated Long-Term Indebtedness
(excluding Primary Subordinated Obligations) of the Borrower and the Subsidiary
Loan Parties shall be comprised of a combination of (a) Indebtedness bearing
interest at a fixed rate and (b) Indebtedness covered by such Hedging
Agreements.

     Section 5.15  Intercompany Agreements.  Each of Holdings and the Borrower
                   -----------------------
agrees that,  prior to the date of this Agreement, true and correct copies of
all intercompany agreements and arrangements between Holdings, the Borrower or
any Subsidiary Loan Party, on the one hand, and the Parent or any other
Affiliate of Holdings, the Borrower or any Subsidiary Loan Party (other than
Holdings, the Borrower or any Subsidiary Loan Party), on the other hand,
including, without limitation, agreements with respect to tax sharing,
management fees or sharing of facilities, services or employees and purchases
pursuant to the Purchase Agreement (collectively, the "Intercompany Agreements")
                                                       -----------------------
shall have been delivered to the Lenders.

     Section 5.16  Agreement regarding FCC Licenses.  Within 60 days after the
                   --------------------------------
written request of the Required Lenders that the Borrower and any License
Subsidiary do so, the Borrower shall, and shall cause such License Subsidiary
to, execute and deliver a written agreement pursuant to which the Borrower or a
Subsidiary, as applicable, is granted the right to use all FCC Licenses held by
such License Subsidiary.

     Section 5.17  Subordination of ChaseTel Earnout.  Each of Holdings and the
                   ---------------------------------
Borrower will, and will cause each Subsidiary Loan Party to, comply in all
material respects with the terms and provisions of the Subordination Agreement
dated as of March 16, 2000, among the Borrower, Holdings, Chase
Telecommunications Holdings, Inc. and Lucent (which subordination agreement
relates to the ChaseTel Earnout), without giving effect to any amendment to or
waiver of any term or provision of such subordination agreement.

                                  ARTICLE VI

                              Negative Covenants
                              ------------------

     Until the Commitments have expired or terminated and the principal of and
interest on each Loan and all fees payable hereunder have been paid in full,
each of Holdings and the Borrower covenants and agrees with the Administrative
Agent and the Lenders that:

CREDIT AGREEMENT - Page 57
<PAGE>

     Section 6.01  Indebtedness; Preferred Stock.  The Borrower will not, nor
                   -----------------------------
will it permit any Subsidiary Loan Party to, create, incur, assume or permit to
exist any Indebtedness or issue any preferred stock, except:

     (a)  Indebtedness created under the Loan Documents and other Eligible
Secured Debt;

     (b)  subject to Section 6.04, Indebtedness of the Borrower to any
                     ------------
Subsidiary and of any Subsidiary to the Borrower or any other Subsidiary;

     (c)  subject to Section 6.04, Guarantees by the Borrower of Indebtedness of
                     ------------
of any Subsidiary;

     (d)  Indebtedness of the Borrower or any Subsidiary incurred to finance the
acquisition, construction or improvement of any fixed or capital assets by the
Borrower or such Subsidiary (other than assets that are an integral part of any
of the telecommunications or data network systems of the Borrower and its
Subsidiaries or other assets that become accessions to such assets or the
removal or loss of which would adversely affect the value of any such assets),
including Capital Lease Obligations and any Indebtedness assumed in connection
with the acquisition of any such assets or secured by a Lien on any such assets
prior to the acquisition thereof; provided that (A) such Indebtedness is
                                  --------
incurred prior to or within 90 days after such acquisition or the completion of
such construction or improvement and (B) any such Indebtedness incurred in
connection with any particular acquisition, construction or improvement shall
not exceed 90% of the cost of such acquisition, construction or improvement;
provided further that the aggregate principal amount of such Indebtedness (and
Indebtedness incurred to refinance such Indebtedness permitted by clause (f)
                                                                  ----------
below) shall not exceed $10,000,000 at any time outstanding;

     (e)  Indebtedness outstanding on the Effective Date and set forth on
Schedule 6.01;
-------------

     (f)  Indebtedness of the Borrower incurred to refinance any Indebtedness
referred to in clause (d) or (e) above and Indebtedness of any Subsidiary
               ----------    ---
incurred to refinance any Indebtedness of such Subsidiary referred to in clause
                                                                         ------
(d) or (e) above; provided that (i) the principal amount of any such
---    ---        --------
Indebtedness does not exceed the principal amount of, plus accrued interest and
                                                      ----
any prepayment premiums applicable to, the Indebtedness refinanced thereby, (ii)
any such Indebtedness has a scheduled maturity date that is on or after the
scheduled maturity date of the Indebtedness refinanced thereby, (iii) any such
Indebtedness has a weighted average life to maturity that is equal to or longer
than the remaining weighted average life to maturity of the Indebtedness
refinanced thereby (determined immediately prior to giving effect to such
refinancing), (iv) any such Indebtedness does not include any provisions that
may require mandatory Repayment thereof prior to scheduled maturity, other than
scheduled repayments taken into account in determining compliance with clause
                                                                       ------
(iii) above and other provisions that are not materially more burdensome than
-----
any such provisions included in the Indebtedness refinanced thereby, (v) any
such Indebtedness shall not be secured by any Lien other than Liens on assets
securing the Indebtedness being refinanced thereby, and shall not be Guaranteed
by any Subsidiary other than any Subsidiary that Guaranteed the Indebtedness
being refinanced thereby, and (vi) if the Indebtedness being refinanced is
subordinated to the Obligations, then such refinancing Indebtedness shall be
subordinated to the Obligations on terms no less favorable to the Lenders than
the Indebtedness being refinanced;

CREDIT AGREEMENT - Page 58
<PAGE>

     (g)  Indebtedness of the Borrower that constitutes a Primary Subordinated
Obligation;

     (h)  other unsecured Indebtedness of the Borrower in an aggregate principal
amount not exceeding $5,000,000 at any time outstanding; and

     (i)  FCC Debt and Permitted License Acquisition Debt of any License
Subsidiary incurred to finance the purchase of any FCC License owned by such
License Subsidiary; provided that (i) the aggregate principal amount of FCC Debt
                    --------
and Permitted License Acquisition Debt of any License Subsidiary shall not
exceed 75% of the sum of such principal amount plus the additional cash
                                               ----
consideration paid to acquire the FCC License or Licenses acquired by such
License Subsidiary, and (ii) the aggregate principal amount of Permitted License
Acquisition Debt incurred on a cumulative basis during the term of this
Agreement shall not exceed [*].

     Section 6.02  Liens.
                   -----

     (a)  The Borrower will not, nor will it permit any Subsidiary Loan Party
to, create, incur, assume or permit to exist any Lien on any property or asset
now owned or hereafter acquired by it, or assign or sell any income or revenues
(including accounts receivable) or rights in respect of any thereof, except:

          (i)   Liens created under the Security Documents;

          (ii)  Permitted Encumbrances;

          (iii) any Lien on any property or asset of the Borrower or any
     Subsidiary existing on the date hereof and set forth in Schedule 6.02;
                                                             -------------
     provided that (A) such Lien shall not apply to any other property or asset
     --------
     of the Borrower or any Subsidiary Loan Party and (B) such Lien shall secure
     only those obligations which it secures on the date hereof and refinancings
     thereof that satisfy the criteria set forth in clause (f) of Section 6.01;
                                                    ----------    ------------

          (iv)  any Lien existing on any property or asset prior to the date
     that such property or asset was first acquired by the Borrower or any
     Subsidiary or any Affiliate thereof or existing on any property or asset of
     any Person that becomes a Subsidiary after the date hereof prior to the
     time such Person becomes a Subsidiary; provided that (A) such Lien is not
                                            --------
     created in contemplation of or in connection with such acquisition or such
     Person becoming a Subsidiary, (B) such Lien shall not apply to any other
     property or assets of the Borrower or any Subsidiary Loan Party and (C)
     such Lien shall secure only those obligations which it secures on the date
     of such acquisition or the date such Person becomes a Subsidiary, as the
     case may be, and refinancings thereof that satisfy the criteria set forth
     in clause (f) of Section 6.01;
        ----------    ------------

CREDIT AGREEMENT - Page 59

[*] Certain material (indicated by an asterisk) has been omitted from this
document pursuant to a request for confidential treatment. The omitted material
has been filed separately with the Securities and Exchange Commission.
<PAGE>

          (v)  Liens on fixed or capital assets (other than assets that are an
     integral part of any of the telecommunications or data network systems of
     the Borrower and its Subsidiaries or other assets that become accessions to
     such assets or the removal or loss of which would adversely affect the
     value of any such assets) acquired, constructed or improved by the Borrower
     or a Subsidiary; provided that (A) such Liens secure only Indebtedness
     permitted by clause (d) of Section 6.01 or a refinancing thereof permitted
                                ------------
     by clause (f) of Section 6.01, (B) such Liens and the Indebtedness secured
                      ------------
     thereby are incurred prior to or within 90 days after such acquisition or
     the completion of such construction or improvement, (C) the Indebtedness
     secured thereby does not exceed 90% of the cost of acquiring, constructing
     or improving such fixed or capital assets and (D) such Liens shall not
     apply to any other property or assets of the Borrower or any Subsidiary
     Loan Party; and

          (vi) any Lien on any FCC License owned by any License Subsidiary
     securing FCC Debt of such Subsidiary incurred to finance the purchase of
     such FCC License.

     (b)  Notwithstanding the foregoing, the Borrower will not, nor will it
permit any Subsidiary Loan Party to, create any Lien (other than any Permitted
Encumbrance, Liens created under the Security Documents and Liens permitted by
clause (vi) of Section 6.01(a) above) on any FCC License.
-----------    ---------------

     Section 6.03  Fundamental Changes; Corporate Structure.
                   ----------------------------------------

     (a)  Neither Holdings nor the Borrower will, nor will it permit any
Subsidiary Loan Party to, merge into or consolidate with any other Person, or
permit any other Person to merge into or consolidate with it, or sell, transfer,
lease or otherwise dispose of (in one transaction or in a series of
transactions) all or substantially all of its assets, or all or substantially
all of the Equity Interests of any of any Subsidiary Loan Party (in each case,
whether now owned or hereafter acquired), or liquidate or dissolve, except that,
if at the time thereof and immediately after giving effect thereto no Default
shall have occurred and be continuing (i) any Subsidiary may merge into any
other Subsidiary, (ii) any Subsidiary may sell, transfer, lease or otherwise
dispose of its assets to another Subsidiary, (iii) any Subsidiary may liquidate
or dissolve if the Borrower determines in good faith that such liquidation or
dissolution is in its best interests and is not materially disadvantageous to
the Lenders, or (iv) ChaseTel may merge with and into the Borrower if the
Borrower is the surviving entity in such merger.

     (b)  The Borrower will not, nor will it permit any of its Subsidiaries to,
engage to any material extent in any business other than the wireless
telecommunications and data networking business and businesses reasonably
related thereto, in each case in the United States.

     (c)  The Borrower will conduct its business as an operating company or
through one or more operating Subsidiaries, which, together with the Borrower,
shall own all equipment and other assets (other than FCC Licenses and Equipment
Site Interests) used to conduct such business.

     (d)  Each Subsidiary will be wholly owned directly by the Borrower and will
be either (i) an operating Subsidiary formed for the purpose of conducting
business in one or more geographical markets as contemplated by paragraph (c)
                                                                -------------
above or (ii) a Real Estate Subsidiary.

CREDIT AGREEMENT - Page 60
<PAGE>

     (e)  The Borrower will not issue any Equity Interests (or warrants, options
or other rights in respect thereof) other than shares of common stock issued to
Holdings that are pledged pursuant to the Borrower Pledge Agreement. The
Borrower will not permit any Subsidiary Loan Party to issue any Equity Interests
(or warrants, options or other rights in respect thereof) other than (i) Equity
Interests issued by Subsidiaries to the Borrower that are pledged pursuant to
the Borrower Pledge Agreement and (ii) Equity Interests issued by License
Subsidiaries to the Parent that are pledged pursuant to the Parent Pledge
Agreement.

     (f)  The Borrower will not (i) have any Subsidiaries organized in a
jurisdiction outside the United States of America or (ii) permit any Collateral
or other assets owned by the Borrower or any Subsidiary to be located in a
jurisdiction outside of the United States of America.

     (g)  Holdings will not issue any Equity Interests (or warrants, options or
other rights in respect thereof) other than (i) Equity Interests issued to the
Parent, (ii) shares of common stock of Holdings issued to Persons other than the
Parent or any Affiliate of the Parent and that do not result in a Change of
Control and (iii) Permitted Preferred Stock of Holdings issued in compliance
with the applicable provisions of this Agreement.  The Net Proceeds of any such
Equity Interests issued by Holdings shall be contributed by Holdings to the
Borrower as common equity (except any such Net Proceeds retained by Holdings to
pay interest on Permitted Holdings Debt or to pay the ChaseTel Earnout).

     Section 6.04  Investments, Loans, Advances, Guarantees and Acquisitions;
                   ----------------------------------------------------------
Asset Sales.
-----------

     (a)  The Borrower will not, nor will it permit any Subsidiary Loan Party
to, purchase, hold or acquire (including pursuant to any merger with any Person
that was not a wholly owned Subsidiary prior to such merger) any Equity
Interests in, evidences of indebtedness or other securities (including any
option, warrant or other right to acquire any of the foregoing) of, make or
permit to exist any loans or advances to, Guarantee any obligations of, or make
or permit to exist any investment or any other interest in, any other Person, or
purchase or otherwise acquire (in one transaction or a series of transactions)
any assets of any other Person constituting a business unit, except:

          (i)   Permitted Investments;

          (ii)  investments by the Borrower in Equity Interests in the
     Subsidiaries;

          (iii) loans or advances (A) made by the Borrower to any Subsidiary
     and (B) made by any Subsidiary to the Borrower; provided that all such
                                                     --------
     loans and advances shall be evidenced by promissory notes pledged pursuant
     to the Borrower Pledge Agreement and shall be subordinated to the
     Obligations as provided in the Subordination Agreement;

          (iv)  Guarantees by the Borrower of obligations of the Subsidiaries;
     and

CREDIT AGREEMENT - Page 61
<PAGE>

          (v)   investments by the Borrower and the Subsidiaries received in
     connection with the bankruptcy or reorganization of, or settlement of
     delinquent accounts and disputes with, customers and suppliers, in each
     case in the ordinary course of business.

     (b)  The Borrower will not, nor will it permit any Subsidiary Loan Party
to, sell, transfer, lease or otherwise dispose of any asset, including any
Equity Interest in any other Person owned by it, except:

          (i)   sales of inventory, obsolete, uneconomic or surplus equipment
     and Permitted Investments, in each case in the ordinary course of business;

          (ii)  transfers constituting investments permitted by paragraph (a) of
                                                                -------------
     this Section or Restricted Payments permitted by Section 6.06;
                                                      ------------

          (iii) sales, transfers and dispositions by the Borrower or a
     Subsidiary to the Borrower or a Subsidiary; and

          (iv)  other sales and dispositions by the Borrower and the
     Subsidiaries of assets (other than Equity Interests in any Subsidiary) with
     a fair market value not exceeding, in the aggregate, $1,000,000 during any
     fiscal year of the Borrower;

provided that all sales, transfers, leases and other dispositions permitted
--------
hereby (other than pursuant to clause (iii) above) shall be made for fair value
                               ------------
and solely for cash consideration.

     Section 6.05  Hedging Agreements.  The Borrower will not, nor will it
                   ------------------
permit any of the Subsidiary Loan Parties to, enter into any Hedging Agreement,
other than Hedging Agreements required by Section 5.14 and other Hedging
                                          ------------
Agreements entered into by the Borrower in the ordinary course of business to
hedge or mitigate risks to which the Borrower or any Subsidiary is exposed in
the conduct of its business or the management of its liabilities.

     Section 6.06  Restricted Payments.  Neither Holdings nor the Borrower will,
                   -------------------
nor will it permit any Subsidiary Loan Party to, declare or make, or agree
to pay or make, directly or indirectly, any Restricted Payment, except:

     (a)  the Borrower may declare and pay dividends with respect to its capital
stock payable solely in additional shares of its common stock;

     (b)  Subsidiaries may declare and pay dividends and distributions to the
Borrower;

     (c)  after the Parent pays the ChaseTel Earnout (but in any event not prior
to January 1, 2006), the Borrower may make Restricted Payments in an aggregate
amount not exceeding the lesser of $41,000,000 or the amount of such ChaseTel
Earnout paid by the Parent (and Holdings may make Restricted Payments with the
proceeds of any such Restricted Payments received by Holdings), provided that at
                                                                --------
the time of and after giving effect to any such Restricted Payment (i) no
Default shall have occurred and be continuing, (ii) the Borrower shall be in
compliance with Sections 6.18 and 6.19 determined on a pro forma basis as of the
                -------------     ----
last day of the most recently ended fiscal quarter of the Borrower for which
financial statements are available as though such payment had been made

CREDIT AGREEMENT - Page 62
<PAGE>

on the first day of each relevant period for testing compliance with such
covenant, and (iii) the ratio of Annualized EBITDA to Fixed Charges shall be
greater than or equal to 1.0 to 1.0;

     (d)  on or after the earlier of April 1, 2004 or the date after the end of
the Availability Period on which the Borrower shall have repaid at least 7.50%
of the aggregate principal amount of the Loans that were outstanding at the end
of the Availability Period, the Borrower may make Restricted Payments at the
time that any scheduled interest payment is due in respect of any Permitted
Holdings Debt or Eligible Parent Debt (and, in the case of Restricted Payments
made in respect of such interest payments on Eligible Parent Debt, Holdings may
make Restricted Payments with the proceeds of any such Restricted Payments
received by Holdings), in an aggregate amount not exceeding the aggregate amount
of such interest payment; provided that (i) at the time of and after giving
                          --------
effect to any such Restricted Payment, (A) no Default shall have occurred and be
continuing and (B) the ratio of Annualized EBITDA to Fixed Charges shall be
greater than or equal to 1.0 to 1.0, (ii) such Restricted Payments shall be
applied to make such interest payment and (iii) the aggregate amount of
Restricted Payments made in reliance upon this clause (d) shall not exceed
                                               ----------
$35,000,000 during any 12-month period;

     (e)  on or after the earlier of June 30, 2005 or the date after the end of
the Availability Period on which the Borrower shall have repaid at least 25% of
the aggregate principal amount of the Loans that were outstanding at the end of
the Availability Period, the Borrower may make Restricted Payments at the time
that any scheduled interest payment is due in respect of any Permitted Holdings
Debt or Eligible Parent Debt (and, in the case of Restricted Payments made in
respect of such interest payments on Eligible Parent Debt, Holdings may make
Restricted Payments with the proceeds of any such Restricted Payments received
by Holdings), in an aggregate amount not exceeding the aggregate amount of such
interest payment; provided that (i) at the time of and after giving effect to
                  --------
any such Restricted Payment, (A) no Default shall have occurred and be
continuing and (B) the ratio of Annualized EBITDA to Fixed Charges shall be
greater than or equal to 1.2 to 1.0, (ii) such Restricted Payments shall be
applied to make such interest payment and (iii) the aggregate amount of
Restricted Payments made in reliance upon this clause (e) together with the
                                               ----------
aggregate amount of Restricted Payments made in reliance upon clause (d) above
                                                              ----------
shall not exceed $100,000,000 during any 12-month period; and

     (f)  the Borrower and Holdings may make Restricted Payments the proceeds of
which are contemporaneously used to purchase FCC Licenses (either directly as an
asset purchase or as a portion of the consideration for the acquisition of an
entity that owns an FCC License, such portion not to exceed the value of such
FCC License) which are contributed to a License Subsidiary within one Business
Day of the date that such Restricted Payments are made.

CREDIT AGREEMENT - Page 63
<PAGE>

     Section 6.07  Transactions with Affiliates.
                   ----------------------------

     (a)  Neither Holdings nor the Borrower will, nor will it permit any
Subsidiary Loan Party to, sell, lease or otherwise transfer any property or
assets to, or purchase, lease or otherwise acquire any property or assets from,
or otherwise engage in any other transactions with, any of its Affiliates,
except (i) transactions that do not involve Holdings and are at prices and on
terms and conditions not less favorable to the Borrower or such Subsidiary Loan
Party than could be obtained on an arm's-length basis from unrelated third
parties, (ii) transactions between or among the Borrower and the Subsidiary Loan
Parties not involving any other Affiliate, (iii) any Restricted Payment
permitted by Section 6.06, and (iv) transactions expressly contemplated by the
             ------------
Intercompany Agreements that are conducted in accordance with the terms of the
Intercompany Agreements.

     (b)  Neither Holdings nor the Borrower will, nor will it permit any
Subsidiary Loan Party to, create, incur, assume or permit to exist any
Indebtedness (or any other obligation or liability of the type defined as a
"Subordinated Obligation" in the Subordination Agreement) owing to or for the
benefit of the Parent or any other Affiliate of Holdings, the Borrower or any
Subsidiary Loan Party, unless (i) such Affiliate shall have become a party to
the Subordination Agreement and agreed to subordinate such Indebtedness (or such
other obligation or liability) as provided therein and (ii) in the case of any
such Indebtedness, such Indebtedness is evidenced by one or more promissory
notes or similar instruments that are pledged pursuant to the Pledge Agreement.

     Section 6.08  Restrictive Agreements.  Neither Holdings nor the Borrower
                   ----------------------
will, nor will it permit any Subsidiary Loan Party to, directly or indirectly,
enter into, incur or permit to exist any agreement or other arrangement that
prohibits, restricts or imposes any condition upon the ability of any Subsidiary
Loan Party to pay dividends or other distributions with respect to any of its
Equity Interests or to make or repay loans or advances to the Borrower or to
Guarantee Indebtedness of the Borrower; provided that (a) the foregoing shall
                                        --------
not apply to restrictions and conditions imposed by law or by any Loan Document
and (b) the foregoing shall not apply to restrictions and conditions existing on
the date hereof identified on Schedule 6.08 (but shall apply to any extension or
                              -------------
renewal of, or any amendment or modification expanding the scope of, any such
restriction or condition).

     Section 6.09  Repayment of Indebtedness.  The Borrower will not, nor will
                   -------------------------
it permit any Subsidiary Loan Party to, make any Repayment in respect of, or
make any payment in violation of any subordination terms of, any Indebtedness of
the Borrower or any Subsidiary Loan Party except (a) any Repayment of
Indebtedness resulting in a prepayment of Loans pursuant to Section 2.09(d) and
                                                            ---------------
(b) Repayments described in any of the clauses of the proviso to Section
                                                                 -------
2.09(d).
-------

     Section 6.10  Intercompany Agreements.  Neither Holdings nor the Borrower
                   -----------------------
will, nor will it permit any Subsidiary Loan Party to, enter into any agreement
or arrangement after the date hereof that would constitute an Intercompany
Agreement without the prior written approval of the Required Lenders.

     Section 6.11  Limitation on Sale-Leaseback Transactions.  The Borrower will
                   -----------------------------------------
not, nor will it permit any Subsidiary Loan Party to, enter into any
arrangement, directly or indirectly, whereby it shall sell or transfer any
property, real or personal, used or useful in its business, whether now owned or
hereafter acquired, and thereafter rent or lease such property or other property
that it intends to use for substantially the same purpose or purposes as the
property sold or transferred.

CREDIT AGREEMENT - Page 64
<PAGE>

     Section 6.12  Equipment Site Interests and Real Estate Subsidiaries.  The
                   -----------------------------------------------------
Borrower will not permit any Equipment Site Interests to be owned or acquired by
any Person other than a Subsidiary that (a) is wholly owned directly by the
Borrower, (b) does not engage in any business or activity other than the
ownership of Equipment Site Interests and activities incidental thereto, (c)
does not own or acquire any assets other than Equipment Site Interests, cash and
Permitted Investments and (d) does not have or incur any Indebtedness or other
liabilities other than liabilities under the Loan Documents, liabilities imposed
by law, including tax liabilities, and other liabilities incidental to its
existence and permitted business and activities (any such Subsidiary satisfying
the foregoing requirements, a "Real Estate Subsidiary"). The Equipment Site
                               ----------------------
Interests relating to all sites in any particular state shall be owned by a
separate Real Estate Subsidiary; provided that if the Equipment Site Interests
                                 --------
relating to sites in any particular BTA are in more than one state, then such
Equipment Site Interests may be owned by the Real Estate Subsidiary that is
formed to own Equipment Site Interests in the state in which a majority of the
sites located in such BTA are situated.

     Section 6.13  FCC Licenses and License Subsidiaries.  The Borrower will not
                   -------------------------------------
permit any FCC License to be owned or acquired by any Person other than a
corporation that (a) is wholly owned directly by the Parent, (b) does not engage
in any business or activity other than the ownership of one or more FCC Licenses
and activities incidental thereto, (c) does not own or acquire any assets other
than one or more FCC Licenses, cash and Permitted Investments and (d) does not
have or incur any Indebtedness or other liabilities other than liabilities under
the Loan Documents, liabilities imposed by law, including tax liabilities, other
liabilities incidental to its existence and permitted business and activities
and FCC Debt or Permitted License Acquisition Debt incurred to finance the
purchase by it of its FCC Licenses (any corporation satisfying the foregoing
requirements, a "License Subsidiary").  Each FCC License that is acquired
                 ------------------
without being financed with FCC Debt or Permitted License Acquisition Debt shall
be owned by a License Subsidiary that does not have any liability in respect of
any FCC Debt or Permitted License Acquisition Debt.  Each FCC License that is
financed with FCC Debt or Permitted License Acquisition Debt shall be owned by a
separate License Subsidiary (which shall be the only Loan Party liable for such
FCC Debt or Permitted License Acquisition Debt), except that any combination of
two or more such FCC Licenses that are acquired contemporaneously pursuant to
the same acquisition may be owned by the same License Subsidiary if required by
the terms of such FCC Debt or Permitted License Acquisition Debt.

     Section 6.14  Amendment of Material Documents.  Neither Holdings nor the
                   -------------------------------
Borrower will, nor will it permit any Subsidiary Loan Party to, amend, modify or
waive any of its rights or obligations under (a) any Intercompany Agreement, (b)
its certificate or articles of incorporation, by-laws or other organizational
documents, (c) the ChaseTel Purchase Agreement, or (d) any agreement or
instrument governing or evidencing any Permitted Holdings Debt, FCC Debt or
Eligible Parent Debt.

     Section 6.15  Capital Expenditures.  The Borrower will not permit the
                   --------------------
aggregate amount of Capital Expenditures made by the Borrower and its
Subsidiaries in any fiscal year to exceed the amount set forth below with
respect to such fiscal year:

          ---------------------------------------------------
               Year                               Amount
          ---------------------------------------------------
          ---------------------------------------------------

CREDIT AGREEMENT - Page 65
<PAGE>

         -------------------------------------------------
                        Year                   Amount
         -------------------------------------------------
         2000                               $550,000,000
         -------------------------------------------------
         2001                               $850,000,000
         -------------------------------------------------
         2002                               $110,000,000
         -------------------------------------------------
         2003                               $180,000,000
         -------------------------------------------------
         2004 and thereafter                $100,000,000
         -------------------------------------------------

         Section 6.16 Covered POPS. The Borrower will not permit the total
                       ------------
number of Covered POPS at any time during any period set forth below to be less
than the number set forth below with respect to such period:

         --------------------------------------------------------------
                   Period                                     Number
         --------------------------------------------------------------

         April 1, 2000 to and including                         275,000
         June 30, 2000
         --------------------------------------------------------------

         July 1, 2000 to and including                        1,150,000
         September 30, 2000
         --------------------------------------------------------------

         October 1, 2000 to and including                     1,150,000
         December 31, 2000
         --------------------------------------------------------------

         January 1, 2001 to and including                     5,000,000
         March 31, 2001
         --------------------------------------------------------------

         April 1, 2001 to and including                       6,000,000
         June 30, 2001
         --------------------------------------------------------------

         July 1, 2001 to and including                        8,000,000
         September 30, 2001
         --------------------------------------------------------------

         October 1, 2001 to and including                    15,000,000
         December 31, 2001
         --------------------------------------------------------------

         January 1, 2002 to and including                    17,500,000
         December 31, 2002
         --------------------------------------------------------------

         January 1, 2003 to and including                    19,800,000
         December 31, 2003
         --------------------------------------------------------------

         January 1, 2004 to and including                    20,500,000
         December 31, 2004
         --------------------------------------------------------------

         January 1, 2005 and thereafter                      21,000,000
         --------------------------------------------------------------

CREDIT AGREEMENT - Page 66
<PAGE>

     Section 6.17   Subscribers. The Borrower will not permit the total number
                    -----------
of Subscribers at any time during any period set forth below to be less than the
number set forth below with respect to such period:

<TABLE>
<CAPTION>
     --------------------------------------------------------------------------
                Period                                             Number
     --------------------------------------------------------------------------
     <S>                                                       <C>
     April 1, 2000 to and including                                      16,500
     June 30, 2000
     --------------------------------------------------------------------------
     July 1, 2000 to and including                                       44,000
     September 30, 2000
     --------------------------------------------------------------------------
     October 1, 2000 to and including                                    56,000
     December 31, 2000
     --------------------------------------------------------------------------
     January 1, 2001 to and including                                   150,000
     March 31, 2001
     --------------------------------------------------------------------------
     April 1, 2001 to and including                                     225,000
     June 30, 2001
     --------------------------------------------------------------------------
     July 1, 2001 to and including                                      355,000
     September 30, 2001
     --------------------------------------------------------------------------
     October 1, 2001 to and including                                   600,000
     December 31, 2001
     --------------------------------------------------------------------------
     January 1, 2002 to and including                                 1,050,000
     March 31, 2002
     --------------------------------------------------------------------------
     April 1, 2002 to and including                                   1,200,000
     June 30, 2002
     --------------------------------------------------------------------------
     July 1, 2002 to and including                                    1,350,000
     September 30, 2002
     --------------------------------------------------------------------------
     October 1, 2002 to and including                                 1,550,000
     December 31, 2002
     --------------------------------------------------------------------------
     January 1, 2003 to and including                                 1,800,000
     March 31, 2003
     --------------------------------------------------------------------------
     April 1, 2003 to and including                                   1,900,000
     June 30, 2003
     --------------------------------------------------------------------------
     July 1, 2003 to and including                                    2,000,000
     September 30, 2003
     --------------------------------------------------------------------------
     October 1, 2003 to and including                                 2,100,000
     December 31, 2003
     --------------------------------------------------------------------------
</TABLE>

CREDIT AGREEMENT - Page 67
<PAGE>

     --------------------------------------------------------------------------
              Period                                                  Number
     --------------------------------------------------------------------------
     January 1, 2004 to and including                                 2,250,000
     December 31, 2004
     --------------------------------------------------------------------------
     January 1, 2005 to and including                                 2,550,000
     December 31, 2005
     --------------------------------------------------------------------------
     January 1, 2006 and thereafter                                   2,700,000
     --------------------------------------------------------------------------

     Section 6.18  Total Indebtedness to Total Capitalization.  The Borrower
                   ------------------------------------------
will not permit the ratio of Total Indebtedness to Total Capitalization at any
time during any period set forth below to exceed the ratio set forth with
respect to such period:

     ------------------------------------------------------------------
               Period                                          Ratio
     ------------------------------------------------------------------
     Initial Availability Date to and                   0.67 to 1.0
     including December 31, 2002
     ------------------------------------------------------------------
     January 1, 2003 to and including                   0.60 to 1.0
     December 31, 2003
     ------------------------------------------------------------------
     January 1, 2004 and thereafter                     0.50 to 1.0
     ------------------------------------------------------------------

     Section 6.19  Total Indebtedness to Annualized EBITDA. The Borrower will
                   ---------------------------------------
not permit the ratio of Total Indebtedness to Annualized EBITDA as of any date
during any period set forth below to exceed the ratio set forth below with
respect to such period:

     ------------------------------------------------------------------
               Period                                          Ratio
     ------------------------------------------------------------------
     January 1, 2003 to and including                   10.0 to 1.0
     March 31, 2003
     ------------------------------------------------------------------
     April 1, 2003 to and including                      7.0 to 1.0
     June 30, 2003
     ------------------------------------------------------------------
     July 1, 2003 to and including                       7.0 to 1.0
     September 30, 2003
     ------------------------------------------------------------------
     October 1, 2003 to and including                    5.5 to 1.0
     December 31, 2003
     ------------------------------------------------------------------
     January 1, 2004 and thereafter                      5.0 to 1.0
     ------------------------------------------------------------------

     Section 6.20 Consolidated EBITDA to Cash Interest Expense. The Borrower
                  --------------------------------------------
will not permit the ratio of Consolidated EBITDA to Cash Interest Expense for
any period of four

CREDIT AGREEMENT - Page 68
<PAGE>

consecutive fiscal quarters ending during any period set
forth below to be less than the ratio set forth with respect to such period:

     ------------------------------------------------------------------
          Period                                         Ratio
     ------------------------------------------------------------------
     October 1, 2002 to and including                1.0 to 1.0
     December 31, 2002
     ------------------------------------------------------------------
     January 1, 2003 to and including                1.3 to 1.0
     March 31, 2003
     ------------------------------------------------------------------
     April 1, 2003 to and including                  1.4 to 1.0
     June 30, 2003
     ------------------------------------------------------------------
     July 1, 2003 to and including                   1.5 to 1.0
     September 30, 2003
     ------------------------------------------------------------------
     October 1, 2003 to and including                1.9 to 1.0
     December 31, 2003
     ------------------------------------------------------------------
     January 1, 2004 and thereafter                  3.0 to 1.0
     ------------------------------------------------------------------

     Section 6.21   Minimum Gross Revenue.
                    ---------------------

     (a)  The Borrower will not permit the consolidated revenue of the Borrower
and the Subsidiary Loan Parties during any fiscal quarter ending on a date set
forth below to be less than the amount set forth below with respect to such
date:

     ---------------------------------------------------------------------------
     Fiscal Quarter Ending                                       Amount
     ---------------------------------------------------------------------------
     December 31, 1999                                              $  1,330,000
     ---------------------------------------------------------------------------
     March 31, 2000                                                 $  2,300,000
     ---------------------------------------------------------------------------
     June 30, 2000                                                  $  4,900,000
     ---------------------------------------------------------------------------
     September 30, 2000                                             $  6,300,000
     ---------------------------------------------------------------------------
     December 31, 2000                                              $ 17,100,000
     ---------------------------------------------------------------------------
     March 31, 2001                                                 $ 25,000,000
     ---------------------------------------------------------------------------
     June 30, 2001                                                  $ 40,000,000
     ---------------------------------------------------------------------------
     September 30, 2001                                             $ 70,000,000
     ---------------------------------------------------------------------------
     December 31, 2001                                              $120,000,000
     ---------------------------------------------------------------------------
     March 31, 2002                                                 $130,000,000
     ---------------------------------------------------------------------------
     June 30, 2002                                                  $150,000,000
     ---------------------------------------------------------------------------

CREDIT AGREEMENT - Page 69
<PAGE>

     ---------------------------------------------------------------------------
            Fiscal Quarter Ending                               Amount
     ---------------------------------------------------------------------------
     September 30, 2002                                             $170,000,000
     ---------------------------------------------------------------------------
     December 31, 2002                                              $190,000,000
     ---------------------------------------------------------------------------
     March 31, 2003                                                 $205,000,000
     ---------------------------------------------------------------------------
     June 30, 2003                                                  $220,000,000
     ---------------------------------------------------------------------------
     September 30, 2003                                             $230,000,000
     ---------------------------------------------------------------------------
     December 31, 2003                                              $250,000,000
     ---------------------------------------------------------------------------

     (b)  The Borrower will not permit the consolidated revenue of the Borrower
and the Subsidiary Loan Parties during any fiscal year ending on a date set
forth below to be less than the amount set forth below with respect to such
date:

     ----------------------------------------------------------------------
     Fiscal Year Ending                               Amount
     ----------------------------------------------------------------------
     December 31, 2004                                $1,100,000,000
     ----------------------------------------------------------------------
     December 31, 2005                                $1,200,000,000
     ----------------------------------------------------------------------
     December 31, 2006 and                            $1,300,000,000
     thereafter
     ----------------------------------------------------------------------

     Section 6.22  Activities of Holdings.  Holdings will not engage in any
                   ----------------------
business or activity other than the ownership of all the outstanding Equity
Interests of the Borrower and activities incidental thereto. Holdings will not
own or acquire any assets (other than shares of common stock of the Borrower,
cash, Permitted Investments and, prior to the issuance of Eligible Parent Debt,
a promissory note issued by the Parent to Holdings as consideration for the
purchase price of equity in Holdings) or incur any liabilities (other than
liabilities under the Loan Documents, liabilities under the Lucent Credit
Agreement and any other credit agreement entered into in the future governing
Eligible Secured Debt, liabilities imposed by law, including tax liabilities,
other liabilities incidental to its existence and liabilities in respect of
Permitted Holdings Debt, the ChaseTel Earnout or guarantees of Eligible Parent
Debt). Holdings will not create, incur, assume or permit to exist any Lien on
any asset now owned or hereafter acquired by it, except Liens created under the
Loan Documents and Permitted Encumbrances.

     Section 6.23  Fiscal Year and Fiscal Quarters.  The Borrower will cause all
                   -------------------------------
of its fiscal years and fiscal quarters to be the same as the calendar years and
calendar quarters.

     Section 6.24  Additional Requirements regarding Permitted Indebtedness and
                   ------------------------------------------------------------
Liens.  Notwithstanding anything to the contrary contained in Section 6.01,
-----                                                         ------------
Section 6.02 or elsewhere in this Agreement, the Borrower will not, nor will it
------------
permit any Loan Party to, (a) create, incur, assume or permit to exist any
Indebtedness which is secured by any Lien created, evidenced or governed by any
of the Security Documents other than Eligible Secured Debt and (b) grant, create
or permit to

CREDIT AGREEMENT - Page 70
<PAGE>

exist any Lien which is created, evidenced or governed by any of the Security
Documents other than Liens securing Eligible Secured Debt.

                                  ARTICLE VII

                               Events of Default
                               -----------------

     If any of the following events ("Events of Default") shall occur:
                                      -----------------

     (a)  the Borrower shall fail to pay any principal of any Loan when and as
the same shall become due and payable, whether at the due date thereof or at a
date fixed for prepayment thereof or otherwise;

     (b)  the Borrower shall fail to pay any interest on any Loan or any fee or
any other amount (other than an amount referred to in clause (a) of this
                                                      ----------
Article) payable under this Agreement or any other Loan Document, when and as
the same shall become due and payable, and such failure shall continue
unremedied for a period of three Business Days;

     (c)  any representation or warranty made or deemed made by or on behalf of
any Loan Party in or in connection with any Loan Document or any amendment or
modification thereof or waiver thereunder, or in any report, certificate,
financial statement or other document furnished pursuant to or in connection
with any Loan Document or any amendment or modification thereof or waiver
thereunder, shall prove to have been incorrect in any respect when made or
deemed made;

     (d)  Holdings or the Borrower shall fail to observe or perform any
covenant, condition or agreement contained in Section 5.02, 5.04 (with respect
                                              ------------  ----
to the existence of the Borrower) or 5.10 or in Article VI;
                                     ----       ----------

     (e)  any Loan Party shall fail to observe or perform any covenant,
condition or agreement contained in any Loan Document (other than those
specified in clause (a), (b) or (d) of this Article), and such failure shall
             ----------  ---    ---
continue unremedied for a period of 30 days after notice thereof from the
Administrative Agent to the Borrower (which notice will be given at the request
of any Lender);

     (f)  any Loan Party shall fail to make any payment (whether of principal or
interest and regardless of amount) in respect of any Material Indebtedness, when
and as the same shall become due and payable;

     (g)  any event or condition occurs that results in any Material
Indebtedness becoming due prior to its scheduled maturity or that enables or
permits (with or without the giving of notice, the lapse of time or both) the
holder or holders of any Material Indebtedness or any trustee or agent on its or
their behalf to cause any Material Indebtedness to become due, or to require the
prepayment, repurchase, redemption or defeasance thereof, prior to its scheduled
maturity; provided that this clause (g) shall not apply to secured Indebtedness
                             ----------
that becomes due as a result of the voluntary sale or transfer of the property
or assets securing such Indebtedness;

     (h)  an involuntary proceeding shall be commenced or an involuntary
petition shall be filed seeking (i) liquidation, reorganization or other relief
in respect of any Loan Party or its debts,

CREDIT AGREEMENT - Page 71
<PAGE>

or of a substantial part of its assets, under any Federal, state or foreign
bankruptcy, insolvency, receivership or similar law now or hereafter in effect
or (ii) the appointment of a receiver, trustee, custodian, sequestrator,
conservator or similar official for any Loan Party or for a substantial part of
its assets, and, in any such case, such proceeding or petition shall continue
undismissed for 60 days or an order or decree approving or ordering any of the
foregoing shall be entered;

     (i)  any Loan Party shall (i) voluntarily commence any proceeding or file
any petition seeking liquidation, reorganization or other relief under any
Federal, state or foreign bankruptcy, insolvency, receivership or similar law
now or hereafter in effect, (ii) consent to the institution of, or fail to
contest in a timely and appropriate manner, any proceeding or petition described
in clause (h) of this Article, (iii) apply for or consent to the appointment of
   ----------
a receiver, trustee, custodian, sequestrator, conservator or similar official
for any Loan Party or for a substantial part of its assets, (iv) file an answer
admitting the material allegations of a petition filed against it in any such
proceeding, (v) make a general assignment for the benefit of creditors or (vi)
take any action for the purpose of effecting any of the foregoing;

     (j)  any Loan Party shall become unable, admit in writing its inability or
fail generally to pay its debts as they become due;

     (k)  one or more judgments for the payment of money in an aggregate amount
in excess of $1,000,000 shall be rendered against any Loan Party or any
combination thereof and the same shall remain undischarged for a period of 30
consecutive days during which execution shall not be effectively stayed, or any
action shall be legally taken by a judgment creditor to attach or levy upon any
assets of any Loan Party to enforce any such judgment;

     (l)  an ERISA Event shall have occurred that, in the opinion of the
Required Lenders, when taken together with all other ERISA Events that have
occurred, could reasonably be expected to result in liability of the Borrower
and its Subsidiaries in an aggregate amount exceeding (i) $1,000,000 in any year
or (ii) $5,000,000 for all periods;

     (m)  any Lien purported to be created under any Security Document shall
cease to be, or shall be asserted by any Loan Party not to be, a valid and
perfected Lien on any Collateral, with the priority required by the applicable
Security Document, except (i) as a result of the sale or other disposition of
the applicable Collateral in a transaction permitted under the Loan Documents or
(ii) as a result of the Collateral Agent's failure to maintain possession of any
stock certificates, promissory notes or other instruments delivered to it under
the Pledge Agreements;

     (n)  a Change in Control shall occur;

     (o)  the loss, revocation, suspension or material impairment of any
material FCC License shall occur;

     (p)  Nortel Networks shall terminate the Purchase Agreement as a result of
any default or breach by the Borrower thereunder, or the Borrower shall
terminate the Purchase Agreement other than by reason of a default or breach by
Nortel Networks thereunder; or

CREDIT AGREEMENT - Page 72
<PAGE>

     (q)  The Borrower or Holdings shall, without the prior written consent of
the "Required Committed Credit Facility Parties" (as such term is defined in the
Collateral Agency Agreement) under each "Credit Facility" (as such term is
defined in the Collateral Agency Agreement), amend or waive in any material
respect any encumbrance or restriction in the Lucent Credit Agreement on the
ability of the Borrower, Holdings or any Subsidiary Loan Party to (i) pay
dividends or make any other distributions permitted by applicable law on any
Equity Interests of the Borrower, Holdings or any Subsidiary Loan Party owned by
the Parent or any of the Parent's subsidiaries, (ii) pay any Indebtedness owed
to the Parent or any of the Parent's subsidiaries, (iii) make loans or advances
to the Parent or any of the Parent's subsidiaries, or (iv) transfer any of its
property or assets to the Parent or any of the Parent's subsidiaries; provided,
                                                                      --------
however, that this clause (q) shall apply only during such time as Section 9.15
-------            ----------                                      ------------
prohibits such encumbrance or restriction from effectively being contained in
this Agreement;

then, and in every such event (other than an event with respect to the Borrower
described in clause (h) or (i) of this Article), and at any time thereafter
             ----------    ---
during the continuance of such event, the Administrative Agent may, and at the
request of the Required Lenders shall, by notice to the Borrower, take either or
both of the following actions, at the same or different times:  (i) terminate
the Commitments, and thereupon the Commitments shall terminate immediately, and
(ii) declare the Loans then outstanding to be due and payable in whole (or in
part, in which case any principal not so declared to be due and payable may
thereafter be declared to be due and payable), and thereupon the principal of
the Loans so declared to be due and payable, together with accrued interest
thereon and all fees and other obligations of the Borrower accrued hereunder,
shall become due and payable immediately, without presentment, demand, protest
or other notice of any kind, all of which are hereby waived by the Borrower; and
in case of any event with respect to the Borrower described in clause (h) or (i)
                                                               ----------    ---
of this Article, the Commitments shall automatically terminate and the principal
of the Loans then outstanding, together with accrued interest thereon and all
fees and other obligations of the Borrower accrued hereunder, shall
automatically become due and payable, without presentment, demand, protest or
other notice of any kind, all of which are hereby waived by the Borrower.

                                 ARTICLE VIII

                                  The Agents
                                  ----------

     Each of the Lenders hereby irrevocably appoints the Administrative Agent as
its agent and authorizes the Administrative Agent to take such actions on its
behalf and to exercise such powers as are delegated to the Administrative Agent
by the terms of the Loan Documents, together with such actions and powers as are
reasonably incidental thereto.

     Any Person serving as Administrative Agent hereunder shall have the same
rights and powers in its capacity as a Lender as any other Lender and may
exercise the same as though it were not the Administrative Agent, and such
Person and its Affiliates may accept deposits from, lend money to and generally
engage in any kind of business with the Borrower or any Subsidiary or other
Affiliate thereof as if it were not the Administrative Agent hereunder.

CREDIT AGREEMENT - Page 73
<PAGE>

     The Administrative Agent shall not have any duties or obligations except
those expressly set forth in the Loan Documents.  Without limiting the
generality of the foregoing, (a) the Administrative Agent shall not be subject
to any fiduciary or other implied duties, regardless of whether a Default has
occurred and is continuing, (b) the Administrative Agent shall not have any duty
to take any discretionary action or exercise any discretionary powers, except
discretionary rights and powers expressly contemplated by the Loan Documents
that the Administrative Agent is required to exercise in writing by the Required
Lenders (or such other number or percentage of the Lenders as shall be necessary
under the circumstances as provided in Section 9.02), and (c) except as
                                       ------------
expressly set forth in the Loan Documents, the Administrative Agent shall not
have any duty to disclose, and shall not be liable for the failure to disclose,
any information relating to any of the Loan Parties that is communicated to or
obtained by the Person serving as Administrative Agent or any of its Affiliates
in any capacity.  The Administrative Agent shall not be liable for any action
taken or not taken by it with the consent or at the request of the Required
Lenders (or such other number or percentage of the Lenders as shall be necessary
under the circumstances as provided in Section 9.02) or in the absence of its
                                       ------------
own gross negligence or wilful misconduct.  The Administrative Agent shall be
deemed not to have knowledge of any Default unless and until written notice
thereof is given to it by the Borrower or a Lender, and the Administrative Agent
shall not be responsible for or have any duty to ascertain or inquire into (i)
any statement, warranty or representation made in or in connection with any Loan
Document, (ii) the contents of any certificate, report or other document
delivered thereunder or in connection therewith, (iii) the performance or
observance of any of the covenants, agreements or other terms or conditions set
forth in any Loan Document, (iv) the validity, enforceability, effectiveness or
genuineness of any Loan Document or any other agreement, instrument or document,
or (v) the satisfaction of any condition set forth in Article IV or elsewhere in
                                                      ----------
any Loan Document, other than to confirm receipt of items expressly required to
be delivered to the Administrative Agent.

     The Administrative Agent shall be entitled to rely upon, and shall not
incur any liability for relying upon, any notice, request, certificate, consent,
statement, instrument, document or other writing believed by it to be genuine
and to have been signed or sent by the proper Person.  The Administrative Agent
also may rely upon any statement made to it orally or by telephone and believed
by it to be made by the proper Person, and shall not incur any liability for
relying thereon.  The Administrative Agent may consult with legal counsel (who
may be counsel for the Borrower), independent accountants and other experts
selected by it, and shall not be liable for any action taken or not taken by it
in accordance with the advice of any such counsel, accountants or experts.

     The Administrative Agent may perform any and all its duties and exercise
its rights and powers by or through any one or more sub-agents appointed by the
Administrative Agent.  The Administrative Agent and any such sub-agent may
perform any and all its duties and exercise its rights and powers through their
respective Related Parties.  The exculpatory provisions of the preceding
paragraphs shall apply to any such sub-agent and to the Related Parties of the
Administrative Agent and any such sub-agent, and shall apply to their respective
activities in connection with the syndication of the credit facilities provided
for herein as well as activities as Administrative Agent.

     Subject to the appointment and acceptance of a successor Administrative
Agent as provided in this paragraph, the Administrative Agent may resign at any
time by notifying the Lenders and the Borrower.  Upon any such resignation, the
Required Lenders shall have the right to appoint a

CREDIT AGREEMENT - Page 74
<PAGE>

successor. If no successor shall have been so appointed by the Required Lenders
and shall have accepted such appointment within 30 days after the retiring
Administrative Agent gives notice of its resignation, then the retiring
Administrative Agent may, on behalf of the Lenders, appoint a successor
Administrative Agent which shall be a bank with an office in New York, New York,
or an Affiliate of any such bank. Upon the acceptance of its appointment as
Administrative Agent hereunder by a successor, such successor shall succeed to
and become vested with all the rights, powers, privileges and duties of the
retiring Administrative Agent, and the retiring Administrative Agent shall be
discharged from its duties and obligations hereunder. The fees payable by the
Borrower to a successor Administrative Agent shall be the same as those payable
to its predecessor unless otherwise agreed between the Borrower and such
successor. After the Administrative Agent's resignation hereunder, the
provisions of this Article and Section 9.03 shall continue in effect for the
                               ------------
benefit of such retiring Administrative Agent, its sub-agents and their
respective Related Parties in respect of any actions taken or omitted to be
taken by any of them while it was acting as Administrative Agent.

     Each Lender acknowledges that it has, independently and without reliance
upon the Administrative Agent or any other Lender and based on such documents
and information as it has deemed appropriate, made its own credit analysis and
decision to enter into this Agreement.  Each Lender also acknowledges that it
will, independently and without reliance upon the Administrative Agent or any
other Lender and based on such documents and information as it shall from time
to time deem appropriate, continue to make its own decisions in taking or not
taking action under or based upon this Agreement, any other Loan Document or
related agreement or any document furnished hereunder or thereunder.

     Each Lender acknowledges and agrees to the terms of the Collateral Agency
Agreement and to the appointment of the Collateral Agent to act as collateral
agent under the Collateral Agency Agreement and the other Security Documents.

                                  ARTICLE IX

                                 Miscellaneous
                                 -------------

     Section 9.01  Notices.  Except in the case of notices and other
                   -------
communications expressly permitted to be given by telephone, all notices and
other communications provided for herein shall be in writing and shall be
delivered by hand or overnight courier service, mailed by certified or
registered mail or sent by telecopy, as follows:

     (a)  if to Holdings or the Borrower, to it at 10307 Pacific Center Court,
San Diego, California 92121, Attention of President (Telecopy No.
(619) 882-6010);

     (b)  if to the Collateral Agent, to it as provided in the Collateral Agency
Agreement;

     (c)  if to the Administrative Agent, to it at Nortel Networks Inc., Mail
Stop  991 15 A40, 2221 Lakeside Blvd., Richardson, Texas  75082-4399, Attention
of Robert D. Beiter, Director, Customer Finance North America (Telecopy No.
(972) 684-3679), with a copy to Nortel Networks Inc., Mail Stop 468/05/B40, 2100
Lakeside Blvd., Richardson, Texas  75082-4399, Attention of Kimberly Poe,
Director, Loan Administration (Telecopy No. (972) 685-3613);

CREDIT AGREEMENT - Page 75
<PAGE>

     (d)  if to Nortel Networks, to it at Nortel Networks Inc., Mail Stop
991 15 A40, 2221 Lakeside Blvd., Richardson, Texas 75082-4399; Attention; Robert
D. Beiter, Director, Customer Finance North America (Telecopy No. (972) 684-
3679),with a copy to Nortel Networks Inc., Mail Stop 468/05/B40, 2100 Lakeside
Blvd., Richardson, Texas 75082-4399, Attention of Kimberly Poe, Director, Loan
Administration (Telecopy No. (972) 685-3613); and

     (e)  if to any other Lender, to it at its address (or telecopy number) set
forth in its Administrative Questionnaire.

Any party hereto may change its address or telecopy number for notices and other
communications hereunder by notice to the other parties hereto.  All notices and
other communications given to any party hereto in accordance with the provisions
of this Agreement shall be deemed to have been given on the date of receipt.

     Section 9.02  Waivers; Amendments.
                   -------------------

     (a)  No failure or delay by either Agent or any Lender in exercising any
right or power hereunder or under any other Loan Document shall operate as a
waiver thereof, nor shall any single or partial exercise of any such right or
power, or any abandonment or discontinuance of steps to enforce such a right or
power, preclude any other or further exercise thereof or the exercise of any
other right or power.  The rights and remedies of the Agents and the Lenders
hereunder and under the other Loan Documents are cumulative and are not
exclusive of any rights or remedies that they would otherwise have.  No waiver
of any provision of any Loan Document or consent to any departure by any Loan
Party therefrom shall in any event be effective unless the same shall be
permitted by paragraph (b) of this Section, and then such waiver or consent
             -------------
shall be effective only in the specific instance and for the purpose for which
given.  Without limiting the generality of the foregoing, the making of a Loan
shall not be construed as a waiver of any Default, regardless of whether an
Agent or any Lender may have had notice or knowledge of such Default at the
time.

     (b)  Neither this Agreement nor any other Loan Document nor any provision
hereof or thereof may be waived, amended or modified except, in the case of this
Agreement, pursuant to an agreement or agreements in writing entered into by
Holdings, the Borrower and the Required Lenders or, in the case of any other
Loan Document, pursuant to an agreement or agreements in writing entered into by
the applicable Agent and the Loan Party or Loan Parties that are parties
thereto, in each case with the consent of the Required Lenders; provided that no
such agreement shall:

          (i)    increase the Commitment of any Lender without the written
     consent of such Lender;

          (ii)   reduce the principal amount of any Loan or reduce the rate of
     interest on such Loan, or reduce any fees payable hereunder, without the
     written consent of each Lender affected thereby;

          (iii)  postpone the scheduled date of payment of the principal amount
     of any Loan or any interest thereon, or any fees payable hereunder, or
     reduce the amount of, waive or

CREDIT AGREEMENT - Page 76
<PAGE>

     excuse any such payment, or postpone the scheduled date of expiration of
     any Commitment, without the written consent of each Lender affected
     thereby;

          (iv)   change Section 2.16(b), (c) or (d) in a manner that would alter
                        ---------------  ---    ---
     the pro rata sharing of payments required thereby, without the written
     consent of each Lender;

          (v)    change any of the provisions of this Section or the definition
     of "Required Lenders" or any other provision of any Loan Document
     specifying the number or percentage of Lenders required to waive, amend or
     modify any rights thereunder or make any determination or grant any consent
     thereunder, without the written consent of each Lender;

          (vi)   release all or any substantial part of the Collateral from the
     Lien of any Security Document (except as expressly provided in such
     Security Document), without the written consent of each Lender;

          (vii)  release Holdings or any Subsidiary Loan Party from its
     Guarantee under the Guarantee Agreement (except as expressly provided in
     the Guarantee Agreement), or limit its liability in respect of such
     Guarantee;

          (viii) change any provisions of any Security Document in a manner
     that adversely affects the pro rata security of the Loans in relation to
     any other Eligible Secured Debt, without the written consent of each
     Lender; or

          (ix)   waive, amend or modify Section 5.10 or any term or provision
                                        ------------
     thereof without the prior written consent of Nortel Networks;

provided further that no such agreement shall amend, modify or otherwise affect
--------
the rights or duties of either Agent without the prior written consent of such
Agent.

     Section 9.03  Expenses; Indemnity; Damage Waiver.
                   ----------------------------------

     (a)  The Borrower shall pay (i) all reasonable out-of-pocket expenses
incurred by Nortel Networks and each Agent, including the reasonable fees,
charges and disbursements of counsel for Nortel Networks or the Agents, in
connection with the preparation and administration of the Loan Documents or any
amendments, modifications or waivers thereof (whether or not the transactions
contemplated hereby are consummated) and (ii) all reasonable out-of-pocket
expenses incurred by either Agent or any Lender, including the reasonable fees,
charges and disbursements of any counsel for either Agent or any Lender, in
connection with the enforcement or protection of its rights or remedies in
connection with the Loan Documents, including its rights or remedies under this
Section, or in connection with the Loans made hereunder, including all such
costs and expenses incurred during any workout, restructuring or negotiations in
respect of such Loans.

     (b)  The Borrower shall indemnify each Agent and each Lender, and each
Related Party of any of the foregoing Persons (each such Person being called an
"Indemnitee") against, and hold each Indemnitee harmless from, any and all
losses, claims, damages, liabilities and related expenses, including the fees,
charges and disbursements of any counsel for any Indemnitee, incurred by or
asserted against any Indemnitee arising out of, in connection with, or as a
result of (i) the execution or delivery of any Loan Document or any other
agreement or instrument contemplated hereby, the

CREDIT AGREEMENT - Page 77
<PAGE>

performance by the parties to the Loan Documents of their respective obligations
thereunder or the consummation of the Transactions or any other transactions
contemplated hereby, (ii) any Loan or the use of the proceeds therefrom, (iii)
any actual or alleged presence or release of Hazardous Materials on or from any
Mortgaged Property or any other property at any time owned or operated by the
Borrower or any of its Subsidiaries, or any Environmental Liability related in
any way to the Borrower or any of its Subsidiaries, or (iv) any actual or
prospective claim, litigation, investigation or proceeding relating to any of
the foregoing, whether based on contract, tort or any other theory and
regardless of whether any Indemnitee is a party thereto; provided that such
indemnity shall not, as to any Indemnitee, be available to the extent that such
losses, claims, damages, liabilities or related expenses have resulted from the
gross negligence or wilful misconduct of such Indemnitee.

     (c)  To the extent that the Borrower fails to pay any amount required to be
paid by it to the Administrative Agent under paragraph (a) or (b) of this
                                             -------------    ---
Section, each Lender severally agrees to pay to the Administrative Agent such
Lender's pro rata share (determined as of the time that the applicable
unreimbursed expense or indemnity payment is sought) of such unpaid amount;
provided that the unreimbursed expense or indemnified loss, claim, damage,
liability or related expense, as the case may be, was incurred by or asserted
against the Administrative Agent in its capacity as such. For purposes hereof, a
Lender's "pro rata share" shall be determined based upon its share of the sum of
the total outstanding Loans and Commitments at the time.

     (d)  To the extent permitted by applicable law, neither Holdings nor the
Borrower shall assert, and each of them hereby waives, any claim against any
Indemnitee, on any theory of liability, for special, indirect, consequential or
punitive damages (as opposed to direct or actual damages) arising out of, in
connection with, or as a result of, this Agreement or any agreement or
instrument contemplated hereby, the Transactions, any Loan or the use of the
proceeds thereof.

     (e)  All amounts due under this Section shall be payable not later than 30
days after written demand therefor.

     Section 9.04  Successors and Assigns.
                   ----------------------

     (a)  The provisions of this Agreement shall be binding upon and inure to
the benefit of the parties hereto and their respective successors and assigns
permitted hereby, except that the Borrower may not assign or otherwise transfer
any of its rights or obligations hereunder without the prior written consent of
each Lender (and any attempted assignment or transfer by the Borrower without
such consent shall be null and void). Nothing in this Agreement, expressed or
implied, shall be construed to confer upon any Person (other than the parties
hereto, their respective successors and assigns permitted hereby and, to the
extent expressly contemplated hereby, the Related Parties of each of the Agents
and the Lenders) any legal or equitable right, remedy or claim under or by
reason of this Agreement.

     (b)  Any Lender may assign to one or more assignees all or a portion of its
rights and obligations under this Agreement (including all or a portion of its
Commitment and the Loans at the time owing to it); provided that:
                                                   --------

          (i)  except in the case of an assignment to Nortel Networks, a Lender
     or an Affiliate of Nortel Networks or a Lender, the Administrative Agent
     must give its prior

CREDIT AGREEMENT - Page 78
<PAGE>

     written consent to such assignment (which consent shall not be unreasonably
     withheld or delayed);

          (ii)  in the case of an assignment to a competitor of the Borrower or
     any of its Subsidiaries (or any Affiliate of any such competitor) or in the
     case of an assignment of a Commitment other than such an assignment to an
     Eligible Assignee, the Borrower must give its prior written consent to such
     assignment (which consent, except in the case of an assignment to any such
     competitor or Affiliate of a competitor, shall not be unreasonably withheld
     or delayed);

          (iii) except in the case of an assignment to Nortel Networks, a
     Lender or an Affiliate of Nortel Networks or a Lender or an assignment of
     the entire remaining amount of the assigning Lender's Commitment and Loans,
     the amount of the Commitment and Loans of the assigning Lender subject to
     each such assignment (determined as of the date the Assignment and
     Acceptance with respect to such assignment is delivered to the
     Administrative Agent) shall not be less than $5,000,000 unless the Borrower
     otherwise consents (except that this clause shall not prohibit the
     assignment of a Fronting Commitment as contemplated by Section 2.02 in an
                                                            ------------
     amount greater than or equal to $1,000,000);

          (iv)  each partial assignment shall be made as an assignment of a
     proportionate part of all the assigning Lender's rights and obligations
     under this Agreement, except that this clause (iv) shall not be construed
                                            -----------
     to prohibit the assignment of a proportionate part of all of the assigning
     Lender's rights and obligations in respect of (A) Loans separately from (or
     without assigning) Commitments or (B) Commitments separately from (or
     without assigning) Loans;

          (v)   the parties to each assignment shall execute and deliver to the
     Administrative Agent an Assignment and Acceptance, together with a
     processing and recordation fee of $3,500; and

          (vi)  the assignee, if it shall not be a Lender, shall deliver to the
     Administrative Agent an Administrative Questionnaire;

provided further that (A) in the event that the Borrower has given its consent
--------
to the identity of a particular assignee of an assignment of loans or
commitments in connection with any assignment relating to the Lucent Credit
Agreement or any credit, loan or other similar agreement relating to any other
Eligible Secured Debt, then the Borrower shall not unreasonably withhold consent
to such assignee under clause (ii) of this paragraph, (B) any consent of the
                       -----------
Borrower otherwise required under clause (iii) of this paragraph shall not be
                                  ------------
unreasonably withheld if and when the Borrower consents to an assignment of less
than $5,000,000 relating to the Lucent Credit Agreement or any credit, loan or
other similar agreement relating to any other Eligible Secured Debt and (C) any
consent of the Borrower otherwise required under this paragraph shall not be
required if an Event of Default under clause (h) or (i) of Article VII has
                                      ----------    ---    -----------
occurred and is continuing.  Subject to acceptance and recording thereof
pursuant to paragraph (d) of this Section, from and after the effective date
            -------------
specified in each Assignment and Acceptance the assignee thereunder shall be a
party hereto and, to the extent of the interest assigned by such Assignment and
Acceptance, have the rights and obligations of a Lender under this Agreement,
and the assigning Lender thereunder shall, to the

CREDIT AGREEMENT - Page 79
<PAGE>

extent of the interest assigned by such Assignment and Acceptance, be released
from its obligations under this Agreement (and, in the case of an Assignment and
Acceptance covering all of the assigning Lender's rights and obligations under
this Agreement, such Lender shall cease to be a party hereto but shall continue
to be entitled to the benefits of Sections 2.13, 2.14, 2.15 and 9.03). Any
                                  -------------  ----  ----     ----
assignment or transfer by a Lender of rights or obligations under this Agreement
that does not comply with this paragraph shall be treated for purposes of this
Agreement as a sale by such Lender of a participation in such rights and
obligations in accordance with paragraph (e) of this Section.
                               -------------

     (c)  The Administrative Agent, acting for this purpose as an agent of the
Borrower, shall maintain at one of its offices a copy of each Assignment and
Acceptance delivered to it and a register for the recordation of the names and
addresses of the Lenders, and the Commitments of, and principal amount of the
Loans owing to, each Lender pursuant to the terms hereof from time to time (the
"Register").  The entries in the Register shall be conclusive, and the Borrower,
 --------
the Agents and the Lenders may treat each Person whose name is recorded in the
Register pursuant to the terms hereof as a Lender hereunder for all purposes of
this Agreement, notwithstanding notice to the contrary.  The Register shall be
available for inspection by the Borrower and any Lender, at any reasonable time
and from time to time upon reasonable prior notice.

     (d)  Upon its receipt of a duly completed Assignment and Acceptance
executed by an assigning Lender and an assignee, the assignee's completed
Administrative Questionnaire (unless the assignee shall already be a Lender
hereunder), the processing and recordation fee referred to in paragraph (b) of
                                                              -------------
this Section and any written consent to such assignment required by paragraph
                                                                    ---------
(b) of this Section, the Administrative Agent shall accept such Assignment
---
and Acceptance and record the information contained therein in the Register and,
promptly thereafter, shall notify the Borrower of such Assignment and
Acceptance. No assignment shall be effective for purposes of this Agreement
unless it has been recorded in the Register as provided in this paragraph.

     (e)  Any Lender may, without the consent of the Borrower or the
Administrative Agent, sell participations to one or more banks or other entities
(a "Participant") in all or a portion of such Lender's rights and obligations
    -----------
under this Agreement (including all or a portion of its Commitments and the
Loans owing to it); provided that (i) such Lender's obligations under this
                    --------
Agreement shall remain unchanged, (ii) such Lender shall remain solely
responsible to the other parties hereto for the performance of such obligations
and (iii) the Borrower, the Agents and the other Lenders shall continue to deal
solely and directly with such Lender in connection with such Lender's rights and
obligations under this Agreement.  Any agreement or instrument pursuant to which
a Lender sells such a participation shall provide that such Lender shall retain
the sole right to enforce the Loan Documents and to approve any amendment,
modification or waiver of any provision of the Loan Documents; provided that
such agreement or instrument may provide that such Lender will not, without the
consent of the Participant, agree to any amendment, modification or waiver
described in the first proviso to Section 9.02(b) that affects such Participant.
                                  ---------------
Subject to paragraph (f) of this Section, the Borrower agrees that each
           -------------
Participant shall be entitled to the benefits of Sections 2.13, 2.14 and 2.15 to
                                                 -------------  ----     ----
the same extent as if it were a Lender and had acquired its interest by
assignment pursuant to paragraph (b) of this Section. To the extent permitted by
                       -------------
law, each Participant also shall be entitled to the benefits of Section 9.08 as
                                                                ------------
though it were a Lender, provided such Participant agrees to be subject to

Section 2.16(d) as though it were a Lender.
---------------

CREDIT AGREEMENT - Page 80
<PAGE>

     (f)  A Participant that would be a Foreign Lender if it were a Lender shall
not be entitled to the benefits of Section 2.15 unless the Borrower is notified
                                   ------------
of the participation sold to such Participant and such Participant agrees, for
the benefit of the Borrower, to comply with Section 2.15(e) as though it were a
                                            ---------------
Lender.

     (g)  Any Lender may at any time pledge or assign a security interest in all
or any portion of its rights under this Agreement to secure obligations of such
Lender, including any pledge or assignment to secure obligations to a Federal
Reserve Bank, and this Section shall not apply to any such pledge or assignment
of a security interest; provided that no such pledge or assignment of a security
interest shall release a Lender from any of its obligations hereunder or
substitute any such pledgee or assignee for such Lender as a party hereto.

     Section 9.05  Survival.  All covenants, agreements, representations and
                   --------
warranties made by the Loan Parties in the Loan Documents and in the
certificates or other instruments delivered in connection with or pursuant to
this Agreement or any other Loan Document shall be considered to have been
relied upon by the other parties hereto and shall survive the execution and
delivery of the Loan Documents and the making of any Loans, regardless of any
investigation made by any such other party or on its behalf and notwithstanding
that either Agent or any Lender may have had notice or knowledge of any Default
or incorrect representation or warranty at the time any credit is extended
hereunder, and shall continue in full force and effect as long as the principal
of or any accrued interest on any Loan or any fee or any other amount payable
under this Agreement is outstanding and unpaid and so long as the Commitments
have not expired or terminated.  The provisions of Sections 2.13, 2.14, 2.15 and
                                                   -------------  ----  ----
9.03 and Article VIII shall survive and remain in full force and effect
----     ------------
regardless of the consummation of the transactions contemplated hereby, the
repayment of the Loans, the expiration or termination of the Commitments or the
termination of this Agreement or any provision hereof.

     Section 9.06  Counterparts; Integration; Effectiveness.  This Agreement
                   ----------------------------------------
may be executed in counterparts (and by different parties hereto on different
counterparts), each of which shall constitute an original, but all of which when
taken together shall constitute a single contract.  This Agreement, the other
Loan Documents and any separate letter agreements with respect to the Borrower's
agreement to cooperate with Nortel Networks with respect to marketing, selling
or syndicating Loans and Commitments or with respect to fees payable to Nortel
Networks or either Agent constitute the entire contract among the parties
relating to the subject matter hereof and supersede any and all previous
agreements and understandings, oral or written, relating to the subject matter
hereof.  Except as provided in Section 4.01, this Agreement shall become
                               ------------
effective when it shall have been executed by the Administrative Agent and when
the Administrative Agent shall have received counterparts hereof which, when
taken together, bear the signatures of each of the other parties hereto, and
thereafter shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns.  Delivery of an executed
counterpart of a signature page of this Agreement by telecopy shall be effective
as delivery of a manually executed counterpart of this Agreement.

     Section 9.07  Severability.  Any provision of this Agreement held to be
                   ------------
invalid, illegal or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such invalidity, illegality or
unenforceability without affecting the validity, legality and enforceability of

CREDIT AGREEMENT - Page 81
<PAGE>

the remaining provisions hereof; and the invalidity of a particular provision in
a particular jurisdiction shall not invalidate such provision in any other
jurisdiction.

     Section 9.08  Right of Setoff.  If an Event of Default shall have occurred
                   ---------------
and be continuing, each Lender and each of its Affiliates is hereby authorized
at any time and from time to time, to the fullest extent permitted by law, to
set off and apply any and all deposits (general or special, time or demand,
provisional or final) at any time held and other obligations at any time owing
by such Lender or Affiliate to or for the credit or the account of the Borrower
against any of and all the obligations of the Borrower now or hereafter existing
under this Agreement held by such Lender, irrespective of whether or not such
Lender shall have made any demand under this Agreement and although such
obligations may be unmatured. The rights of each Lender under this Section are
in addition to other rights and remedies (including other rights of setoff)
which such Lender may have.

     Section 9.09  Governing Law; Jurisdiction; Consent to Service of Process.
                   ----------------------------------------------------------

     (a)  This Agreement shall be construed in accordance with and governed by
the law of the State of New York.

     (b)  Each of Holdings and the Borrower hereby irrevocably and
unconditionally submits, for itself and its property, to the nonexclusive
jurisdiction of the Supreme Court of the State of New York sitting in New York
County and of the United States District Court of the Southern District of New
York, and any appellate court from any thereof, in any action or proceeding
arising out of or relating to any Loan Document, or for recognition or
enforcement of any judgment, and each of the parties hereto hereby irrevocably
and unconditionally agrees that all claims in respect of any such action or
proceeding may be heard and determined in such New York State or, to the extent
permitted by law, in such Federal court.  Each of the parties hereto agrees that
a final judgment in any such action or proceeding shall be conclusive and may be
enforced in other jurisdictions by suit on the judgment or in any other manner
provided by law.  Nothing in this Agreement or any other Loan Document shall
affect any right that either Agent or any Lender may otherwise have to bring any
action or proceeding relating to this Agreement or any other Loan Document
against Holdings or the Borrower or its properties in the courts of any
jurisdiction.

     (c)  Each of Holdings and the Borrower hereby irrevocably and
unconditionally waives, to the fullest extent it may legally and effectively do
so, any objection which it may now or hereafter have to the laying of venue of
any suit, action or proceeding arising out of or relating to this Agreement or
any other Loan Document in any court referred to in paragraph (b) of this
                                                    -------------
Section. Each of the parties hereto hereby irrevocably waives, to the fullest
extent permitted by law, the defense of an inconvenient forum to the maintenance
of such action or proceeding in any such court.

     (d)  Each party to this Agreement irrevocably consents to service of
process in the manner provided for notices in Section 9.01. Nothing in this
                                              ------------
Agreement or any other Loan Document will affect the right of any party to this
Agreement to serve process in any other manner permitted by law.

     Section 9.10  WAIVER OF JURY TRIAL.  EACH PARTY HERETO HEREBY WAIVES, TO
                   --------------------
THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL
BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF OR
RELATING TO THIS

CREDIT AGREEMENT - Page 82
<PAGE>

AGREEMENT, ANY OTHER LOAN DOCUMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY
(WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY). EACH PARTY HERETO (A)
CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS
REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE
EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES
THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS
AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS
SECTION.

     Section 9.11  Headings.  Article and Section headings and the Table of
                   --------
Contents used herein are for convenience of reference only, are not part of this
Agreement and shall not affect the construction of, or be taken into
consideration in interpreting, this Agreement.

     Section 9.12  Confidentiality.  Each of the Agents and the Lenders agrees
                   ---------------
to maintain the confidentiality of the Information (as defined below), except
that Information may be disclosed (a) to its and its Affiliates' directors,
officers, employees and agents, including accountants, legal counsel and other
advisors (it being understood that the Persons to whom such disclosure is made
will be informed of the confidential nature of such Information and instructed
to keep such Information confidential), (b) to the extent requested by any
regulatory authority, (c) to the extent required by applicable laws or
regulations or by any subpoena or similar legal process, (d) to any other party
to this Agreement, (e) in connection with the exercise of any remedies hereunder
or any suit, action or proceeding relating to this Agreement or any other Loan
Document or the enforcement of any rights hereunder or thereunder, (f) subject
to an agreement containing provisions substantially the same as those of this
Section, to any assignee of or Participant in, or any prospective assignee of or
Participant in, any of its rights or obligations under this Agreement, (g) with
the consent of the Borrower or (h) to the extent such Information (i) becomes
publicly available other than as a result of a breach of this Section or (ii)
becomes available to either Agent or any Lender on a nonconfidential basis from
a source other than Holdings or the Borrower.  For the purposes of this Section,
"Information" means all information received from Holdings or the Borrower
relating to Holdings or the Borrower or its business, other than any such
information that is publicly available or available to either Agent or any
Lender on a nonconfidential basis prior to disclosure by Holdings or the
Borrower.  Any Person required to maintain the confidentiality of Information as
provided in this Section shall be considered to have complied with its
obligation to do so if such Person has exercised the same degree of care to
maintain the confidentiality of such Information as such Person would accord to
its own confidential information.

CREDIT AGREEMENT - Page 83
<PAGE>

     Section 9.13  Interest Rate Limitation.
                   ------------------------

     (a)  Notwithstanding anything herein to the contrary, (i) no interest rate
specified in this Agreement or any other Loan Document shall at any time exceed
the Maximum Rate (as hereinafter defined) and (ii) if at any time the interest
rate applicable to any Loan, together with all fees, charges and other amounts
which are treated as interest on such Loan under applicable law (collectively
the "Charges"), shall exceed the maximum lawful rate (the "Maximum Rate") which
     -------                                               ------------
may be contracted for, charged, taken, received or reserved by the Lender
holding such Loan in accordance with applicable law, the rate of interest
payable in respect of such Loan hereunder, together with all Charges payable in
respect thereof, shall be limited to the Maximum Rate and, to the extent lawful,
the interest and Charges that would have been payable in respect of such Loan
but were not payable as a result of the operation of this Section shall be
cumulated and the interest and Charges payable to such Lender in respect of
other Loans or periods shall be increased (but not above the Maximum Rate
therefor) until such cumulated amount, together with interest thereon at the
Federal Funds Effective Rate to the date of repayment, shall have been received
by such Lender.

     (b)  Notwithstanding anything to the contrary contained in this Agreement
or the other Loan Documents, none of the terms and provisions of this Agreement
or the other Loan Documents shall ever be construed to create a contract or
obligation to pay interest at a rate in excess of the Maximum Rate; and neither
the Administrative Agent nor any Lender shall ever charge, receive, take,
collect, reserve or apply, as interest on the Credit Facility Obligations, any
amount in excess of the Maximum Rate.  The parties hereto agree that any
interest, charge, fee, expense or other obligation provided for in this
Agreement or in the other Loan Documents which constitutes interest under
applicable law shall be, ipso facto and under any and all circumstances, limited
or reduced to an amount equal to the lesser of (i) the amount of such interest,
charge, fee, expense or other obligation that would be payable in the absence of
this Section 9.13 or (ii) an amount, which when added to all other interest
     ------------
payable under this Agreement and the other Loan Documents, equals the Maximum
Rate.  If, notwithstanding the foregoing, the Administrative Agent or any Lender
ever contracts for, charges, receives, takes, collects, reserves or applies as
interest any amount in excess of the Maximum Rate, such amount which would be
deemed excessive interest shall be deemed a partial payment or prepayment of
principal of the Credit Facility Obligations and treated hereunder as such; and
if the Credit Facility Obligations, or applicable portions thereof, are paid in
full, any remaining excess shall promptly be paid to the Borrower.  In
determining whether the interest paid or payable, under any specific
contingency, exceeds the Maximum Rate, the Borrower, the Administrative Agent
and the Lenders shall, to the maximum extent permitted by applicable law, (A)
characterize any nonprincipal payment as an expense, fee or premium rather than
as interest, (B) exclude voluntary prepayments and the effects thereof, and (C)
amortize, prorate, allocate and spread in equal or unequal parts the total
amount of interest throughout the entire contemplated term of the Credit
Facility Obligations, or applicable portions thereof, so that the interest rate
does not exceed the Maximum Rate at any time during the term of the Credit
Facility Obligations; provided that, if the unpaid principal balance is paid and
                      -------------
performed in full prior to the end of the full contemplated term thereof, and if
the interest received for the actual period of existence thereof exceeds the
Maximum Rate, the Administrative Agent and/or the Lenders, as appropriate, shall
refund to the Borrower the amount of such excess and, in such event, the
Administrative Agent and the Lenders shall not be subject to any penalties
provided by any laws for contracting for, charging, receiving, taking,
collecting, reserving or applying interest in excess of the Maximum Rate.

CREDIT AGREEMENT - Page 84
<PAGE>

     Section 9.14  Amendments to Other Credit Agreements.  If the Borrower or
                   -------------------------------------
any other Loan Party in any way (a) amends, modifies or supplements any Other
Loan Document in any manner that is materially more restrictive to any Loan
Party or that is materially more beneficial to any lender or any agent of any
lender or (b) enters into any Other Loan Document that is materially more
restrictive to any Loan Party or that is materially more beneficial to any
lender or any agent of any lender, in each case as compared to this Agreement
and/or the other Loan Documents (as applicable), then Holdings and the Borrower
agree to promptly notify the Administrative Agent in writing of the nature and
terms of such amendment, modification or supplement or such Other Loan Document
(as applicable) and to promptly deliver to the Administrative Agent a true,
correct and complete copy of such amendment, modification or supplement or such
Other Loan Document (as applicable).  Furthermore, if any such amendment,
modification or supplement or such Other Loan Document (as applicable) is
reasonably likely to materially disadvantage any Lender with respect to its
efforts to assign any of its Loans or Commitment, each of Holdings and the
Borrower agrees that, promptly upon the request of the Administrative Agent or
the Required Lenders, it (i) will amend, modify or supplement (as applicable)
the appropriate terms and provisions of this Agreement and the other Loan
Documents in the same manner as such amendment, modification or supplement to
such Other Loan Document or (ii) in the case of an Other Loan Document newly
executed, amend, modify, supplement or amend and restate (as applicable) the
appropriate terms and provisions of this Agreement and the other Loan Documents
or (in the case of an amendment and restatement) this Agreement and the other
Loan Documents (as applicable) such that the Agreement and the other Loan
Documents are consistent with such Other Loan Document (as applicable);
provided, however, that if such amendment, modification or other supplement to
--------  -------
such Other Loan Document or if such newly-executed Other Loan Document (as
applicable) was made in connection with any consideration given by any lender or
by any agent of any lender to any Loan Party, then the obligations of Holdings
and the Borrower to amend, modify, supplement or amend and restate this
Agreement and the other Loan Documents pursuant to this sentence shall be
conditioned upon the Lender(s) providing the same or equivalent consideration to
such Loan Party.

     Section 9.15  Parent Indenture Exception.  Anything herein to the
                   --------------------------
contrary not withstanding, until the restrictions thereon contained in Section
4.16 of the Parent Indenture have been eliminated or terminated, this Agreement
will not prohibit the Borrower, Holdings or any Subsidiary Loan Party from:

     (a)  paying dividends or making any other distributions permitted by
applicable law on any Equity Interests of the Borrower, Holdings or such
Subsidiary Loan Party owned by the Parent or any of the Parent's subsidiaries;

     (b)  paying any Indebtedness owed to the Parent or any of the Parent's
subsidiaries;

     (c)  making loans or advances to the Parent or any of the Parent's
subsidiaries; or

     (d)  transferring any of its property or assets to the Parent or any of the
Parent's subsidiaries,

to the extent, but only to the extent, that restrictions on such actions
referred to in clauses (a), (b), (c) and (d) preceding are prohibited by such
               -----------  ---  ---     ---
Section 4.16.  Upon the elimination or termination of any such prohibition in
Section 4.16 of the Parent Indenture, the terms or provisions hereof which

CREDIT AGREEMENT - Page 85
<PAGE>

would otherwise prohibit or restrict such actions shall immediately and
automatically be effective with respect thereto.

           [The remainder of this page is intentionally left blank.]

CREDIT AGREEMENT - Page 86
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed by their respective authorized officers as of the day and year
first above written.

                         CRICKET COMMUNICATIONS HOLDINGS, INC.

                         By:    ________________________________________
                         Name:  Stefan C. Karnavas
                         Title: Vice President

                         CRICKET COMMUNICATIONS, INC.

                         By:    ________________________________________
                         Name:  Stefan C. Karnavas
                         Title: Vice President

                         NORTEL NETWORKS INC.,
                         individually and as Administrative Agent

                         By:    ________________________________________
                         Name:  Robert D. Beiter
                         Title: Director, Customer Finance North America

CREDIT AGREEMENT - Page 87
<PAGE>

                                PROMISSORY NOTE
                                ---------------

$525,000,000.00                                                  August 28, 2000

     FOR VALUE RECEIVED, the undersigned, CRICKET COMMUNICATIONS, INC., a
Delaware corporation (the "Borrower"), hereby promises to pay to the order of
                           --------
NORTEL NETWORKS INC. (the "Lender"), by payment thereof to the account of the
                           ------
Administrative Agent specified in the Credit Agreement, in lawful money of the
United States of America and in immediately available funds and without
deduction, set-off or other reduction as specified in Section 2.15 of the Credit
                                                      ------------
Agreement, the principal amount of FIVE HUNDRED AND TWENTY-FIVE MILLION DOLLARS
($525,000,000.00) or such lesser amount as shall equal the aggregate of the
Loans made or deemed made by the Lender (or its predecessor in interest) to the
Borrower under the Credit Agreement referred to below, on the dates and in the
principal amounts provided in the Credit Agreement, and to pay interest on the
unpaid principal amount of each such Loan, at such office, in like money and
funds, for the period commencing on the date of advance of each such Loan until
such Loan shall be paid in full, at the rates per annum and on the dates
provided in the Credit Agreement.

     This Note evidences loans made by the Lender (and/or its predecessors in
interest) from time to time pursuant to that certain Credit Agreement dated as
of August 28, 2000, among the Borrower, Cricket Communications Holdings, Inc.,
the Lenders named therein and Nortel Networks Inc., as administrative agent for
itself and the other Lenders (such Credit Agreement, as the same may be amended,
modified, supplemented, renewed, extended or restated from time to time, being
referred to herein as the "Credit Agreement").  The holder of this Note shall be
                           ----------------
entitled to, without limitation, the benefits provided in the Credit Agreement
as set forth therein. The Credit Agreement, among other things, contains
provisions for acceleration of the maturity of this Note upon the happening of
certain stated events and for prepayment of the Loans prior to the maturity of
this Note upon the terms and conditions specified in the Credit Agreement.
Capitalized terms used in this Note have the respective meanings assigned to
them in the Credit Agreement.

     THIS NOTE SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF
THE STATE OF NEW YORK (WITHOUT REGARD TO CONFLICTS OF LAWS PRINCIPLES) AND THE
APPLICABLE LAWS OF THE UNITED STATES OF AMERICA.

     Except as may be otherwise provided in the Loan Documents, each of the
Borrower and each surety, guarantor, endorser and other party ever liable for
payment of any sums of money payable on this Note jointly and severally waives
notice, presentment, demand for payment, protest, notice of protest and non-
payment or dishonor, notice of acceleration, notice of intent to accelerate,
notice of intent to demand, diligence in collecting, grace and all other
formalities of any kind, and consent to all extensions without notice for any
period or periods of time and partial payments, before or after maturity, and
any impairment of any collateral securing this Note, all without prejudice to
the holder. Except as may be otherwise provided in the Loan Documents, the
holder shall similarly have the right to deal in any way, at any time, with one
or more of the foregoing parties without notice to any other party, and to grant
any such party any

                                       1
<PAGE>

extensions of time for payment of any of said indebtedness, or to release or
substitute part or all of the collateral securing this Note, or to grant any
other indulgences or forbearances whatsoever, without notice to any other party
and without in any way affecting the personal liability of any party hereunder.

     THIS NOTE, TOGETHER WITH THE OTHER LOAN DOCUMENTS, REPRESENTS THE FINAL
AGREEMENT OF THE PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF
AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE
PARTIES.

                              CRICKET COMMUNICATIONS, INC.

                              By: _______________________________
                              Name: _____________________________
                              Title: ____________________________

                                       2
<PAGE>

                                   Exhibit A
                                   ---------

                           ASSIGNMENT AND ACCEPTANCE
                           -------------------------

                          Date: _______________, ____

     Reference is made to that certain Credit Agreement dated as of August 28,
2000 (as the same may be amended, modified, supplemented, renewed, extended or
restated from time to time, the "Credit Agreement") among Cricket
                                 ----------------
Communications, Inc., (the "Borrower"), Cricket Communications Holdings, Inc.,
                            --------
the Lenders named therein (the "Lenders") and Nortel Networks Inc., as
                                -------
administrative agent for itself and the other Lenders (in such capacity, the
"Administrative Agent").  Capitalized terms used herein and not otherwise
---------------------
defined herein shall have the meanings assigned to such terms in the Credit
Agreement.  This Assignment and Acceptance is being executed pursuant to Section
                                                                         -------
9.04 of the Credit Agreement.
----

     ___________________________ (the "Assignor") and _______________________
                                       --------
(the "Assignee") agree as follows:
      --------

     (1)  The Assignor hereby sells and assigns to the Assignee, and the
Assignee hereby purchases and assumes from the Assignor, the following interests
in and to the Assignor's rights and obligations under the Credit Agreement and
the other Loan Documents as of the Effective Date (as defined below) [note:
complete the following, as applicable]:

     (a)  a ____% interest in the Loans (which percentage interest represents a
          $________ Commitment with respect to the aggregate Commitments of
          $525,000,000); and

     (b)  $__________ of principal amount of the outstanding Loans.

     2.   The Assignor (a) represents that, as of the date hereof but
immediately prior to giving effect to this Assignment and Acceptance: (i) its
Commitment is $_______________, and (ii) the outstanding principal amount of its
Commitment is $__________, (b) makes no representation or warranty and assumes
no responsibility with respect to any statements, warranties or representations
made in or in connection with the Credit Agreement or any other Loan Document or
the execution, legality, validity, enforceability, genuineness, sufficiency or
value of the Credit Agreement or any other Loan Document, other than that it is
the legal and beneficial owner of the interest being assigned by it hereunder
and that such interest is free and clear of any adverse claim; (c) makes no
representation or warranty and assumes no responsibility with respect to the
financial condition or results of operations of the Borrower or any Affiliate of
the Borrower or the performance or observance by the Borrower or any Affiliate
of the Borrower of any of its indebtedness, liabilities or obligations under the
Credit Agreement or any other Loan Document; and (d) attaches the promissory
note (if any) evidencing the Commitment and/or Loans being assigned (the "Note")
                                                                          ----
held by the Assignor and requests that the Administrative Agent exchange such
Note for [a] new promissory note[s] payable to the order of [(i)] the Assignee
in an amount equal to the sum of the principal amount of the applicable Loans
plus the principal amount of the unfunded applicable Commitment assigned to the
Assignee pursuant hereto, [and (ii) the Assignor in an amount equal to the sum
of the

                                       3
<PAGE>

principal amount of the applicable Loans plus the principal amount of the
unfunded applicable Commitment retained by the Assignor].

     3.   The Assignee (a) represents and warrants that it is legally authorized
to enter into this Assignment and Acceptance; (b) confirms that it has received
a copy of the Credit Agreement, together with copies of the most recent
financial statements delivered pursuant to Section 5.01 thereof, and such other
                                           ------------
documents and information as it has deemed appropriate to make its own credit
analysis and decision to enter into this Assignment and Acceptance; (c) agrees
that it will, independently and without reliance upon the Administrative Agent,
the Assignor or any other Lender and based on such documents and information as
it shall deem appropriate at the time, continue to make its own credit decisions
in taking or not taking action under the Credit Agreement and the other Loan
Documents; (d) confirms that it is an Eligible Assignee; (e) appoints and
authorizes the Administrative Agent and/or the Collateral Agent to take such
action on the Assignee's behalf and to exercise such powers under the Loan
Documents as are delegated to the Administrative Agent and/or the Collateral
Agent, respectively, by the terms thereof, together with such powers as are
reasonably incidental thereto; (f) agrees that it will perform in accordance
with their terms all obligations which by the terms of the Credit Agreement and
the other Loan Documents are required to be performed by it as a Lender; (g)
agrees that it will keep confidential all information with respect to the
Borrower and its Affiliates furnished to it by the Borrower or any of its
Affiliates or the Assignor (other than information generally available to the
public) in accordance with Section 9.12 of the Credit Agreement; and (h)
                           ------------
attaches the forms prescribed by the Internal Revenue Service of the United
States and Section 2.15 of the Credit Agreement certifying as to the Assignee's
           ------------
exemption from United States withholding taxes with respect to all payments to
be made to the Assignee under the Credit Agreement, or a certificate as to the
Assignee's exemption from United States withholding taxes with respect to all
payments to be made to the Assignee under the Credit Agreement, or such other
documents as are necessary to indicate that all such payments are subject to
such tax at a rate reduced by an applicable tax treaty./1/

     4.   The effective date for this Assignment and Acceptance shall be
___________ ____, ___ (the "Effective Date")./2/ Following the execution of this
                            --------------
Assignment and Acceptance, it will be delivered to the Administrative Agent for
acceptance and recording by the Administrative Agent.

     5.   Upon such acceptance and recording, from and after the Effective Date,
(a) the Assignee shall be a party to the Credit Agreement and, to the extent
provided in this Assignment and Acceptance, shall have the rights and
obligations of a Lender thereunder and under the other Loan Documents and (b)
the Assignor shall, to the extent provided in this Assignment and Acceptance,
relinquish its rights and be released from its obligations under the Credit
Agreement and the other Loan Documents.

_______________________
  /1/  If the Assignee is organized under the laws of a jurisdiction outside the
United States.

  /2/  Such date shall be at least five (5) Business Days after the execution of
this Assignment and Acceptance and delivery thereof to the Administrative Agent,
unless otherwise agreed by the Administrative Agent.

                                       4
<PAGE>

     6.   Upon such acceptance and recording, from and after the Effective Date,
the Administrative Agent shall make all payments in respect of the interest
assigned hereby (including payments of principal, interest, fees and other
amounts) to the Assignee. The Assignor and Assignee shall make all appropriate
adjustments in payments under the Credit Agreement and the promissory notes
evidencing the Loans (if any) for periods prior to the Effective Date directly
between themselves.

     7.   THIS ASSIGNMENT AND ACCEPTANCE SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO CONFLICTS
OF LAWS PRINCIPLES) AND APPLICABLE LAWS OF THE UNITED STATES OF AMERICA.

     8.   The Assignee's address for notices and office for purposes of the
Credit Agreement (until such address or office are subsequently changed in
accordance with the Credit Agreement) are specified in the Administrative
Questionnaire completed by the Assignee and delivered to the Administrative
Agent.

                              [NAME OF ASSIGNOR]

                              By:    ________________________
                              Name:  ________________________
                              Title: ________________________

                              [NAME OF ASSIGNEE]

                              By:    ________________________
                              Name:  ________________________
                              Title: ________________________

                                       5
<PAGE>

[Note:  Add the following if and to the extent the written consent of the
Administrative Agent or the Borrower is required by the Credit Agreement.]

This Assignment and Acceptance is hereby consented to by [each of] the
undersigned:

NORTEL NETWORKS INC.,
as Administrative Agent

By:    _______________________________
Name:  _______________________________
Title: _______________________________
Date:  _______________________________

CRICKET COMMUNICATIONS, INC.

By:    _______________________________
Name:  _______________________________
Title: _______________________________
Date:  _______________________________

                                       6
<PAGE>

                                   Exhibit B
                                   ---------

                                       7
<PAGE>

================================================================================

                              AMENDED AND RESTATED

                 COLLATERAL AGENCY AND INTERCREDITOR AGREEMENT

                                  dated as of

                                 [      ], 2000

                                     among

                         CRICKET COMMUNICATIONS, INC.,

                 The Representatives and Unrepresented Holders
                              referred to herein,

                               SOCIETE GENERALE,

                                      and

                      STATE STREET BANK AND TRUST COMPANY,
                              as Collateral Agent

================================================================================
<PAGE>

                                                               TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                                                 Page
                                                                                 ----
<S>                                                                               <C>
ARTICLE I    Definitions........................................................    2

 SECTION 1.01.  Defined Terms...................................................    2

 SECTION 1.02.  Terms Generally.................................................   15

 SECTION 1.03.  Accounting Terms; GAAP..........................................   15

ARTICLE II   Permitted Additional Obligations;  Additional Security Documents...   16

 SECTION 2.01.  Permitted Additional Obligations................................   16

 SECTION 2.02.  Additional Security Documents...................................   17

ARTICLE III  Acts of Secured Parties;  Amounts of Obligations...................   17

 SECTION 3.01.  Acts of Secured Parties.........................................   18

 SECTION 3.02.  Determination of Amounts of Obligations.........................   18

 SECTION 3.03.  Restrictions on Actions.........................................   19

ARTICLE IV   Duties of Collateral Agent.........................................   20

 SECTION 4.01.  Notice to Secured Parties.......................................   20

 SECTION 4.02.  Actions Under Support Documents.................................   20

 SECTION 4.03.  Conflicting Instructions; No Instructions.......................   23

 SECTION 4.04.  Records.........................................................   24

ARTICLE V    Collateral Accounts; Distributions.................................   25

 SECTION 5.01.  The Collateral Accounts.........................................   25

 SECTION 5.02.  Application of Proceeds.........................................   27

 SECTION 5.03.  Time of Payments................................................   27

 SECTION 5.04.  Application of Amounts Not Distributable........................   27

 SECTION 5.05.  Treatment of Contingent Obligations.............................   28

 SECTION 5.06.  Collateral Agent's Calculations.................................   28

ARTICLE VI   Agreements.........................................................   29

 SECTION 6.01.  Delivery of Agreements..........................................   29

 SECTION 6.02.  Information.....................................................   29

ARTICLE VII  The Collateral Agent...............................................   30

 SECTION 7.01.  Appointment; Rights and Duties..................................   30

 SECTION 7.02.  Expenses; Indemnity; Damage Waiver..............................   32

ARTICLE VIII Representations and Warranties.....................................   34

 SECTION 8.01.  Organization; Powers............................................   34

 SECTION 8.02.  Authorization; Enforceability...................................   34

 SECTION 8.03.  Governmental Approvals; No Conflicts............................   35
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                               <C>
ARTICLE IX   Intercreditor Arrangements.........................................   35

 SECTION 9.01.  Security Interests..............................................   35

 SECTION 9.02.  Turnover of Collateral and Certain Payments.....................   35

 SECTION 9.03.  Release of Collateral and Guarantees............................   36

 SECTION 9.04.  Additional Collateral...........................................   37

 SECTION 9.05.  Purchase of Collateral..........................................   37

 SECTION 9.06.  Further Assurances, etc.........................................   37

 SECTION 9.07.  Restrictions on Prepayments and Purchases of Indebtedness.......   38

 SECTION 9.08.  Payment of Amounts Owing under Secured Instruments..............   38

 SECTION 9.09.  Certain Amendments to Credit Agreement..........................   39

ARTICLE X    Benefit of Agreement...............................................   40

ARTICLE XI   Miscellaneous......................................................  40

 SECTION 11.01.  Notices........................................................  40

 SECTION 11.02.  Waivers; Amendments............................................  41

 SECTION 11.03.  Counterparts...................................................  42

 SECTION 11.04.  Severability...................................................  43

 SECTION 11.05.  Governing Law; Jurisdiction; Consent to Service of Process.....  43

 SECTION 11.06.  WAIVER OF JURY TRIAL...........................................  44

 SECTION 11.07.  Headings.......................................................  44

 SECTION 11.08.  Successors and Assigns.........................................  44

 SECTION 11.09.  Termination....................................................  45

 SECTION 11.10.  Complete Agreement.............................................  45
</TABLE>

EXHIBIT:

     Exhibit A -- Form of Permitted Additional Obligations
                     Designation

                                       ii
<PAGE>

                    AMENDED AND RESTATED COLLATERAL AGENCY AND INTERCREDITOR
                AGREEMENT dated as of [    ], 2000 among CRICKET COMMUNICATIONS,
                INC. a Delaware corporation, STATE STREET BANK AND TRUST
                COMPANY, as Collateral Agent, SOCIETE GENERALE, and the
                Representatives and Unrepresented Holders referred to herein.

          WHEREAS the Borrower (such term, and other capitalized terms used in
this preliminary statement, having the meanings set forth in this Agreement
below) has entered into the Credit Agreement pursuant to which the Lenders have
made and will continue to make Loans to the Borrower;

          WHEREAS the Loan Parties have entered into certain Security Documents
in order to secure the Credit Facility Obligations and the Subsidiary Loan
Parties have entered into the Guarantee Agreement in order to guarantee the
Credit Facility Obligations;

          WHEREAS the Borrower may from time to time incur Permitted Additional
Obligations that may be secured under the Security Documents and guaranteed
pursuant to the Guarantee Agreement and the Parent Guarantee Agreement;

          WHEREAS the Borrower, the Collateral Agent and the Administrative
Agent have entered into the Amended and Restated Collateral Agency and
Intercreditor Agreement dated as of August 14, 2000, amending and restating the
Collateral Agency and Intercreditor Agreement dated as of November 24, 1999 (as
so amended and restated, the "Existing Agreement") in order to set forth certain
                              ------------------
agreements with respect to the Obligations to be so secured and guaranteed,
including mechanisms for securing Permitted Additional Obligations and certain
intercreditor arrangements with respect to the enforcement of rights under the
Support Documents and the allocation of proceeds in respect of the Obligations;
and

          WHEREAS, the Borrower (a) has entered into (or, concurrently with the
execution and delivery hereof, is entering into) the Nortel Credit Agreement,
(b) has designated (or, concurrently with the execution and delivery hereof, is
designating) the Nortel Facility
<PAGE>

Obligations as Permitted Additional Obligations in accordance with Section 2.01
of the Existing Agreement and (c) has requested that the Existing Agreement be
amended and restated in the form hereof in order to confirm that the Nortel
Facility Obligations are entitled to the benefits of the Support Documents and
to effect certain other changes to the Existing Agreement;

          NOW THEREFOR, the parties hereto agree as follows:

                                   ARTICLE I

                                  Definitions
                                  -----------

          SECTION 1.01.  Defined Terms.  As used in this Agreement, the
                         --------------
following terms have the meanings specified below:

          "Act" has the meaning set forth in Section 3.01.
           ---

          "Additional Security Document" means any agreement or instrument
           ----------------------------
(other than the Initial Security Documents) creating or evidencing a security
interest of the Collateral Agent in, or a Lien in favor of the Collateral Agent
on, or an assignment to the Collateral Agent of, any Collateral.

          "Affiliate" means, with respect to a specified Person, another Person
           ---------
that directly, or indirectly through one or more intermediaries, Controls or is
Controlled by or is under common Control with the Person specified.

          "Administrative Agent" means Lucent Technologies Inc., in its capacity
           --------------------
as administrative agent for the Lenders under the Credit Agreement.

          "Borrower" means Cricket Communications, Inc. (formerly known as
           --------
Cricket Wireless Communications, Inc.), a Delaware corporation.

          "Borrower Pledge Agreement" means the Borrower Pledge Agreement dated
           -------------------------
as of November 24, 1999, among Holdings, the Borrower, the Subsidiary Loan
Parties and the Collateral Agent.
<PAGE>

          "Business Day" has the meaning assigned to such term in the Credit
           ------------
Agreement or, if the Credit Agreement is not in effect, the Nortel Credit
Agreement.

          "Capital Lease Obligations" of any Person means the obligations of
           -------------------------
such Person to pay rent or other amounts under any lease of (or other
arrangement conveying the right to use) real or personal property, or a
combination thereof, which obligations are required to be classified and
accounted for as capital leases on a balance sheet of such Person under GAAP,
and the amount of such obligations shall be the capitalized amount thereof
determined in accordance with GAAP.

          "ChaseTel Subordination Agreement"  means the Subordination Agreement
           --------------------------------
dated as of March 16, 2000, among Holdings, the Borrower, the Administrative
Agent and Chase Telecommunications Holdings, Inc., a Delaware corporation.

          "Collateral" means (a) any and all "Collateral" as defined in any
           ----------
applicable Security Document and (b) any and all other assets of whatever
nature, tangible or intangible, now owned or existing or hereafter acquired or
arising in which the Collateral Agent has been granted a Lien or security
interest, or that have been assigned to the Collateral Agent, pursuant to any of
the Security Documents.

          "Collateral Accounts" has the meaning set forth in Section 5.01(a).
           -------------------

          "Collateral Agent" means State Street Bank and Trust Company, in its
           ----------------
capacity as collateral agent for the Secured Parties under the Support
Documents.

          "Contingent Obligations" means any Obligations that are contingent
           ----------------------
obligations or not yet liquidated, including any obligation for the
reimbursement of any letter of credit that is outstanding but not yet drawn
upon.

          "Contingent Obligations Collateral Account" has the meaning set forth
           -----------------------------------------
in Section 5.05.

          "Control" means the possession, directly or indirectly, of the power
           -------
to direct or cause the direction of the management or policies of a Person,
whether through the  ability to exercise voting power, by contract or
<PAGE>

otherwise. "Controlling" and "Controlled" have meanings correlative thereto.
            -----------       ----------

          "Credit Agreement" means the Credit Agreement dated as of September
           ----------------
20, 1999, among Holdings, the Borrower, the Lenders and the Administrative
Agent; provided that, for purposes of the Support Documents (other than this
       --------
Agreement), any reference to "the Credit Agreement" therein shall be deemed to
mean "each Secured Instrument" (as defined herein).

          "Credit Facility" means a credit facility, or group of credit
           ---------------
facilities, extended pursuant to a single Secured Instrument.  For purposes of
this definition, all credit facilities that are governed by the same credit
agreement, loan agreement or similar document, or in respect of which the
Secured Parties thereunder vote together for purposes of declaring or waiving
defaults, shall be deemed to be extended pursuant to the same Secured
Instrument.

          "Credit Facility Obligations" means (a) the principal of and premium,
           ---------------------------
if any, and interest (including interest accruing during the pendency of any
bankruptcy, insolvency, receivership or other similar proceeding, regardless of
whether allowed or allowable in such proceeding) on the Loans, when and as due,
whether at maturity, by acceleration, upon one or more dates set for prepayment
or otherwise and (b) all other monetary obligations, including fees, costs,
expenses and indemnities, whether primary, secondary, direct, contingent, fixed
or otherwise (including monetary obligations incurred during the pendency of any
bankruptcy, insolvency, receivership or other similar proceeding, regardless of
whether allowed or allowable in such proceeding) of the Borrower under the
Credit Agreement.

          "Effective Date" has the meaning assigned to such term in the Credit
           --------------
Agreement.  The parties hereto acknowledge that the Effective Date occurred on
September 20, 1999.

          "Enforcement Collateral Account" has the meaning set forth in Section
           ------------------------------
5.01(a).

          "Environmental Laws" means all laws, rules, regulations, codes,
           ------------------
ordinances, orders, decrees, judgments, injunctions, notices or binding
agreements issued,
<PAGE>

promulgated or entered into by any Governmental Authority, relating in any way
to the environment, preservation or reclamation of natural resources, the
management, release or threatened release of any Hazardous Material or to health
and safety matters.

          "Environmental Liability" means any liability, contingent or otherwise
           -----------------------
(including any liability for damages, costs of environmental remediation, fines,
penalties or indemnities), of the Borrower or any Subsidiary directly or
indirectly resulting from or based upon (a) violation of any Environmental Law,
(b) the generation, use, handling, transportation, storage, treatment or
disposal of any Hazardous Materials, (c) exposure to any Hazardous Materials,
(d) the release or threatened release of any Hazardous Materials into the
environment or (e) any contract, agreement or other consensual arrangement
pursuant to which liability is assumed or imposed with respect to any of the
foregoing.

          "Equity Interests" means shares of capital stock, partnership
           ----------------
interests, membership interests in a limited liability company, beneficial
interests in a trust or other equity ownership interests in a Person.

          "Financial Officer" means the chief financial officer, principal
           -----------------
accounting officer, treasurer or controller of the Borrower.

          "GAAP" means, subject to Section 1.03, generally accepted accounting
           ----
principles in the United States of America.

          "General Collateral Account" has the meaning set forth in Section
           --------------------------
5.01(a).

          "General Funds" means funds required to be deposited in the General
           -------------
Collateral Account as provided in Section 5.01(b).

          "General Funds Release Request" means a written request delivered by
           -----------------------------
the Borrower to the Collateral Agent requesting the Collateral Agent to release
funds from the General Collateral Account.  Each General Funds Release Request
(a) shall specify (i) the amount of funds to be released, (ii) the date of the
requested release, (iii) the purpose for which the Borrower expects to use such
funds, (iv) the applicable provisions of the applicable Secured Instrument or
Secured
<PAGE>

Instruments pursuant to which such funds are being released and (v) the wire
instructions for the transfer of such funds to or for the account of the
Borrower and (b) shall be accompanied by a certificate of a Financial Officer to
the effect that such requested release of funds is not in contravention of any
Secured Instrument.

          "Governmental Authority" means the government of the United States of
           ----------------------
America, any other nation or any political subdivision thereof, whether state or
local, and any agency, authority, instrumentality, regulatory body, court,
central bank or other entity exercising executive, legislative, judicial,
taxing, regulatory or administrative powers or functions of or pertaining to
government.

          "Guarantee" of or by any Person (the "guarantor") means any
           ---------                            ---------
obligation, contingent or otherwise, of the guarantor guaranteeing or having the
economic effect of guaranteeing any Indebtedness or other obligation of any
other Person (the "primary obligor") in any manner, whether directly or
                   ---------------
indirectly, and including any obligation of the guarantor, direct or indirect,
(a) to purchase or pay (or advance or supply funds for the purchase or payment
of) such Indebtedness or other obligation or to purchase (or to advance or
supply funds for the purchase of) any security for the payment thereof, (b) to
purchase or lease property, securities or services for the purpose of assuring
the owner of such Indebtedness or other obligation of the payment thereof, (c)
to maintain working capital, equity capital or any other financial statement
condition or liquidity of the primary obligor so as to enable the primary
obligor to pay such Indebtedness or other obligation or (d) as an account party
in respect of any letter of credit or letter of guaranty issued to support such
Indebtedness or obligation; provided, that the term Guarantee shall not include
                            --------
endorsements for collection or deposit in the ordinary course of business.

          "Guarantee Agreement" means the Guarantee Agreement dated as of
           -------------------
November 24, 1999, among Holdings, the Subsidiary Loan Parties and the
Collateral Agent.

          "Hazardous Materials" means all explosive or radioactive substances or
           -------------------
wastes and all hazardous or toxic substances, wastes or other pollutants,
including petroleum or petroleum distillates, asbestos or asbestos containing
materials, polychlorinated biphenyls, radon gas, infectious
<PAGE>

or medical wastes and all other substances or wastes of any nature regulated
pursuant to any Environmental Law.

          "Holder" means any direct holder of, or creditor party to a Secured
           ------
Instrument in respect of, any Obligations.

          "Holdings" means Cricket Communications Holdings, Inc. (formerly known
           --------
as Cricket Communications, Inc.), a Delaware corporation.

          "Indebtedness" of any Person means, without duplication, (a) all
           ------------
obligations of such Person for borrowed money or with respect to advances of any
kind, (b) all obligations of such Person evidenced by bonds, debentures, notes
or similar instruments, (c) all obligations of such Person upon which interest
charges are customarily paid, (d) all obligations of such Person under
conditional sale or other title retention agreements relating to property
acquired by such Person, (e) all obligations of such Person in respect of the
deferred purchase price of property or services (excluding current accounts
payable incurred in the ordinary course of business), (f) all Indebtedness of
others secured by (or for which the holder of such Indebtedness has an existing
right, contingent or otherwise, to be secured by) any Lien on property owned or
acquired by such Person, whether or not the Indebtedness secured thereby has
been assumed, (g) all Guarantees by such Person of Indebtedness of others, (h)
all Capital Lease Obligations of such Person, (i) all obligations, contingent or
otherwise, of such Person as an account party in respect of letters of credit
and letters of guaranty and (j) all obligations, contingent or otherwise, of
such Person in respect of bankers' acceptances.  The Indebtedness of any Person
shall include the Indebtedness of any other entity (including any partnership in
which such Person is a general partner) to the extent such Person is liable
therefor as a result of such Person's ownership interest in or other
relationship with such entity, except to the extent the terms of such
Indebtedness provide that such Person is not liable therefor.

          "Indemnitee" has the meaning assigned to such term in Section 7.02.
           ----------

          "Indemnity, Subrogation and Contribution Agreement" means the
           -------------------------------------------------
Indemnity, Subrogation and
<PAGE>

Contribution Agreement dated as of November 24, 1999, among the Borrower, the
Subsidiary Loan Parties and the Collateral Agent.

          "Initial Security Documents" means this Agreement, the Security
           --------------------------
Agreement, the Borrower Pledge Agreement and the Parent Pledge Agreement.

          "Lenders" means the lenders from time to time party to the Credit
           -------
Agreement; provided that, for purposes of the Support Documents (other than this
           --------
Agreement), any reference to "Lender" or "Lenders" therein shall be deemed to
mean "Secured Party" or "Secured Parties" (as defined herein), respectively.

          "License Subsidiary" has the meaning assigned to such term in the
           ------------------
Credit Agreement or, if the Credit Agreement is not in effect, the Nortel Credit
Agreement.

          "Lien" means, with respect to any asset, (a) any mortgage, deed of
           ----
trust, lien, pledge, hypothecation, encumbrance, charge or security interest in,
on or of such asset, (b) the interest of a vendor or a lessor under any
conditional sale agreement, capital lease or title retention agreement (or any
financing lease having substantially the same economic effect as any of the
foregoing) relating to such asset and (c) in the case of securities, any
purchase option, call or similar right of a third party with respect to such
securities.

          "Loan Documents" means the "Loan Documents", as defined in each of the
           --------------
Credit Agreement and the Nortel Credit Agreement and includes all other
agreements, documents and instruments evidencing or governing any of the
Obligations (including all Secured Instruments and Support Documents), in each
case as in effect from time to time.

          "Loan Parties" means the Parent, Holdings, the Borrower and the
           ------------
Subsidiary Loan Parties.

          "Loans" has the meaning assigned to such term in the Credit Agreement;
           -----
provided that, for purposes of the Support Documents (other than this
--------
Agreement), any reference to "Loans" therein shall be deemed to mean
"Obligations" (as defined herein).

          "Moody's means Moody's Investors Service, Inc.
           -------
<PAGE>

          "Non-Vendor Secured Party" means any Secured Party that (a) is not a
           ------------------------
Vendor or an Affiliate of a Vendor, (b) is not a Holder of any Obligations
Guaranteed by or otherwise subject to credit support provided by a Vendor or an
Affiliate of a Vendor and (c) is not subject to any agreement or arrangement
pursuant to which any Vendor or an Affiliate of any Vendor has the right to
direct, or to consent or approve of the exercise of, any voting rights of such
Secured Party in respect of the Obligations held by it.

          "Nortel Agent" means Nortel Networks Inc., in its capacity as
           ------------
administrative agent for the Nortel Lenders under the Nortel Credit Agreement.

          "Nortel Credit Agreement" means the Credit Agreement dated as of
           -----------------------
August 28, 2000, among Holdings, the Borrower, the Nortel Lenders and the Nortel
Agent.

          "Nortel Facility Obligations" means (a) the principal of and premium,
           ---------------------------
if any, and interest (including interest accruing during the pendency of any
bankruptcy, insolvency, receivership or other similar proceeding, regardless of
whether allowed or allowable in such proceeding) on the Nortel Loans, when and
as due, whether at maturity, by acceleration, upon one or more dates set for
prepayment or otherwise and (b) all other monetary obligations, including fees,
costs, expenses and indemnities, whether primary, secondary, direct, contingent,
fixed or otherwise (including monetary obligations incurred during the pendency
of any bankruptcy, insolvency, receivership or other similar proceeding,
regardless of whether allowed or allowable in such proceeding) of the Borrower
under the Nortel Credit Agreement.

          "Nortel Lenders" means the lenders from time to time party to the
           --------------
Nortel Credit Agreement.

          "Nortel Loans" has the meaning assigned to the term "Loans" in the
           ------------
Nortel Credit Agreement.

          "Notice of Cancelation of Enforcement" means, with respect to any
           ------------------------------------
Notice of Enforcement, a notice or notices delivered to the Collateral Agent by
Representatives and/or Unrepresented Holders canceling such Notice of
Enforcement in accordance with Section 4.02.
<PAGE>

          "Notice of Enforcement" means a notice or notices delivered to the
           ---------------------
Collateral Agent by Representatives and/or Unrepresented Holders in accordance
with Section 4.02 stating that (a) all or part of the Obligations are due and
payable and remain unpaid and any applicable grace period for payment thereof
has lapsed or (b) all or part of the Obligations are then permitted by the
Secured Instrument or Secured Instruments under which such Obligations are
outstanding (because of the occurrence of an event of default or similar event
under such Secured Instrument or Secured Instruments) to be declared due and
payable prior to the stated maturity thereof pursuant to the terms of such
Secured Instrument or Secured Instruments.  A Notice of Enforcement shall be
deemed to have been given when the notice referred to in the preceding sentence
has actually been received by the Collateral Agent and to have been rescinded
when the Collateral Agent has actually received a Notice of Cancelation of
Enforcement.  A Notice of Enforcement shall be deemed to be in effect at all
times after such Notice of Enforcement has been given until such time, if any,
as such Notice of Enforcement has been rescinded.  The Representatives and
Unrepresented Holders that delivered a Notice of Enforcement shall rescind such
Notice of Enforcement once such Representatives and Unrepresented Holders are
satisfied that the event or events giving rise to such Notice of Enforcement
have been cured or waived in accordance with the applicable Secured Instrument
and no other event has occurred and is continuing that would permit a Notice of
Enforcement to be given.

          "Obligations" means, collectively, the Credit Facility Obligations,
           -----------
the Nortel Facility Obligations and all Permitted Additional Obligations.

          "Parent" means Leap Wireless International, Inc., a Delaware
           ------
corporation.

          "Parent Guarantee Agreement" means the Guarantee Agreement dated as of
           --------------------------
August 28, 2000, between the Parent and the Collateral Agent.

          "Parent Pledge Agreement" means the Parent Pledge Agreement dated
           -----------------------
November 24, 1999, among the Parent and the Collateral Agent.
<PAGE>

          "Permitted Additional Obligations" means (a) the principal of and
           --------------------------------
premium, if any, and interest (including interest accruing during the pendency
of any bankruptcy, insolvency, receivership or other similar proceeding,
regardless of whether allowed or allowable in such proceeding) on any
Indebtedness for borrowed money of the Borrower, but only to the extent that
such Indebtedness is designated as "Permitted Additional Obligations" in
accordance with Section 2.01, and (b) all other monetary obligations (other than
monetary obligations in respect of Indebtedness that does not constitute
Permitted Additional Obligations), including fees, costs, expenses and
indemnities, whether primary, secondary, direct, contingent, fixed or otherwise
(including monetary obligations incurred during the pendency of any bankruptcy,
insolvency, receivership or other similar proceeding, regardless of whether
allowed or allowable in such proceeding) of the Borrower under the Secured
Instrument governing or evidencing such Indebtedness referred to in clause (a)
above; provided that any Indebtedness or obligations owing to Holdings, any
       --------
Subsidiary Loan Party or Affiliate of the Borrower shall not constitute
Permitted Additional Obligations.

          "Permitted Additional Obligations Designation" means each Permitted
           --------------------------------------------
Additional Obligations Designation duly completed and executed by the Collateral
Agent, the Borrower and the holder or holders of the Permitted Additional
Obligations referenced therein (or a Representative of such holders) and
delivered pursuant to Section 2.01, substantially in form of Exhibit A.

          "Permitted Investments" means:
           ---------------------

          (a) direct obligations of, or obligations the principal of and
interest on which are unconditionally guaranteed by, the United States of
America (or by any agency thereof to the extent such obligations are backed by
the full faith and credit of the United States of America), in each case
maturing within one year from the date of acquisition thereof;

          (b) investments in commercial paper maturing within 270 days from the
date of acquisition thereof and having, at such date of acquisition, the highest
credit rating obtainable from S&P or from Moody's;
<PAGE>

          (c) investments in certificates of deposit, banker's acceptances and
time deposits maturing within 180 days from the date of acquisition thereof
issued or guaranteed by or placed with, and money market deposit accounts issued
or offered by, any domestic office of any commercial bank organized under the
laws of the United States of America or any State thereof which has a combined
capital and surplus and undivided profits of not less than $500,000,000; and

          (d) fully collateralized repurchase agreements with a term of not more
than 30 days for securities described in clause (a) above and entered into with
a financial institution satisfying the criteria described in clause (c) above.

          "Person" means any natural person, corporation, limited liability
           ------
company, trust, joint venture, association, company, partnership, Governmental
Authority or other entity.

          "Principal Obligations" means the principal amount of the outstanding
           ---------------------
Obligations.

          "Related Parties" means, with respect to any specified Person, such
           ---------------
Person's Affiliates and the respective directors, officers, employees, agents
and advisors of such Person and such Person's Affiliates.

          "Representative" means, as to any Secured Party or Secured Parties,
           --------------
any Person designated in the Secured Instrument evidencing or governing the
Obligations held by such Secured Party or Secured Parties as the trustee, agent
or representative of such Secured Party or Secured Parties (including, in the
case of the Credit Facility Obligations, the Administrative Agent and, in the
case of the Nortel Facility Obligations, the Nortel Agent).

          "Required Committed Credit Facility Parties" means, at any time, with
           ------------------------------------------
respect to any Credit Facility, Secured Parties having outstanding Principal
Obligations and Secured Instrument Commitments under such Credit Facility
representing more than 50% of the aggregate principal amount of the total
outstanding Principal Obligations and Secured Instrument Commitments under such
Credit Facility at such time.

          "Required Committed Secured Parties" means, at any time, Secured
           ----------------------------------
Parties having outstanding Principal

<PAGE>

Obligations and Secured Instrument Commitments representing more than 50% of the
sum of the total outstanding Principal Obligations and Secured Instrument
Commitments at such time.

          "Required Credit Facility Parties" means, at any time, with respect to
           --------------------------------
any Credit Facility, Secured Parties having outstanding Principal Obligations
under such Credit Facility representing more than 50% of the aggregate principal
amount of the total outstanding Principal Obligations under such Credit Facility
at such time.

          "Required Non-Vendor Secured Parties" means, at any time, Non-Vendor
           -----------------------------------
Secured Parties having outstanding Principal Obligations representing more than
50% of the aggregate principal amount of the total outstanding Principal
Obligations held by all Non-Vendor Secured Parties at such time.

          "Required Secured Parties" means, at any time, Secured Parties having
           ------------------------
outstanding Principal Obligations representing more than 50% of the aggregate
principal amount of the total outstanding Principal Obligations at such time.

          "S&P" means Standard & Poor's.
           ---

          "Secured Instrument" means any instrument or agreement (other than the
           ------------------
Support Documents) that evidences or governs the terms of any of the Obligations
(including, in the case of the Credit Facility Obligations, the Credit Agreement
and, in the case of the Nortel Facility Obligations, the Nortel Credit
Agreement).

          "Secured Instrument Commitments" means, at any time, commitments in
           ------------------------------
effect at such time to extend credit to the Borrower under any Secured
Instrument that, if extended at such time, would constitute Principal
Obligations.

          "Secured Parties" means the Collateral Agent and the Holders of the
           ---------------
Obligations (including, in the case of the Credit Facility Obligations, the
Lenders and the Administrative Agent and, in the case of the Nortel Facility
Obligations, the Nortel Lenders and the Nortel Agent).
<PAGE>

          "Security Agreement" means the Security Agreement dated as of November
           ------------------
24, 1999, among the Borrower, the Subsidiary Loan Parties and the Collateral
Agent.

          "Security Documents" means the Initial Security Documents and the
           ------------------
Additional Security Documents.
          "Subordination Agreement" means the Subordination Agreement dated as
           -----------------------
of November 24, 1999, among the Loan Parties and the Collateral Agent.

          "Subordination Collateral Account" has the meaning set forth in
           --------------------------------
Section 5.01(a).

          "subsidiary" means, with respect to any Person (the "parent") at any
           ----------                                          ------
date, any corporation, limited liability company, partnership, association or
other entity the accounts of which would be consolidated with those of the
parent in the parent's consolidated financial statements if such financial
statements were prepared in accordance with GAAP as of such date, as well as any
other corporation, limited liability company, partnership, association or other
entity (a) of which securities or other ownership interests representing more
than 50% of the equity or more than 50% of the ordinary voting power or, in the
case of a partnership, more than 50% of the general partnership interests are,
as of such date, owned, controlled or held, or (b) that is, as of such date,
otherwise Controlled, by the parent or one or more subsidiaries of the parent or
by the parent and one or more subsidiaries of the parent.

          "Subsidiary" means any subsidiary of the Borrower.
           ----------

          "Subsidiary Loan Parties" means the Subsidiaries and the License
           -----------------------
Subsidiaries.

          "Support Documents" means the Security Documents, the Indemnity,
           -----------------
Subrogation and Contribution Agreement, the Subordination Agreement, the
Guarantee Agreement and the Parent Guarantee Agreement.

          "Unrepresented Holder" means any Holder for which there is no
           --------------------
Representative.

          "Vendor" means a Person that sells equipment to, or provides non-
           ------
financial services to, any of the Loan Parties.
<PAGE>

          SECTION 1.02.  Terms Generally.  The definitions of terms herein shall
                         ----------------
apply equally to the singular and plural forms of the terms defined.  Whenever
the context may require, any pronoun shall include the corresponding masculine,
feminine and neuter forms.  The words "include", "includes" and "including"
shall be deemed to be followed by the phrase "without limitation".  The word
"will" shall be construed to have the same meaning and effect as the word
"shall".  Unless the context requires otherwise (a) any definition of or
reference to any agreement, instrument or other document herein shall be
construed as referring to such agreement, instrument or other document as from
time to time amended, supplemented or otherwise modified, (b) any reference
herein to any Person shall be construed to include such Person's successors and
assigns, (c) the words "herein", "hereof" and "hereunder", and words of similar
import, shall be construed to refer to this Agreement in its entirety and not to
any particular provision hereof, (d) all references herein to Articles, Sections
and Exhibits shall be construed to refer to Articles and Sections of, and
Exhibits to, this Agreement and (e) the words "asset" and "property" shall be
construed to have the same meaning and effect and to refer to any and all
tangible and intangible assets and properties, including cash, securities,
accounts, contract rights, licenses and intellectual property.

          SECTION 1.03.  Accounting Terms; GAAP.  Except as otherwise expressly
                         -----------------------
provided herein, all terms of an accounting or financial nature shall be
construed in accordance with GAAP, as in effect from time to time; provided
                                                                   --------
that, if the Borrower notifies the Collateral Agent that the Borrower requests
an amendment to any provision hereof to eliminate the effect of any change
occurring after the date hereof in GAAP or in the application thereof on the
operation of such provision (or if the Collateral Agent notifies the Borrower
that the Required Committed Secured Parties request an amendment to any
provision hereof for such purpose), regardless of whether any such notice is
given before or after such change in GAAP or in the application thereof, then
such provision shall be interpreted on the basis of GAAP as in effect and
applied immediately before such change shall have become effective until such
notice shall have been withdrawn or such provision amended in accordance
herewith.
<PAGE>

                                  ARTICLE II

                       Permitted Additional Obligations;
                       ---------------------------------
                         Additional Security Documents
                         -----------------------------

          SECTION 2.01.  Permitted Additional Obligations.  (a)  The Borrower
                         ---------------------------------
may from time to time designate any Indebtedness (including Indebtedness to be
advanced pursuant to Secured Instrument Commitments under any Credit Facility)
for borrowed money of the Borrower as Permitted Additional Obligations hereunder
by (i) delivering to the Collateral Agent a Permitted Additional Obligations
Designation in respect of such Indebtedness describing such Indebtedness and
attaching thereto a true and complete copy of all instruments and agreements
(together with all schedules, exhibits, annexes, appendices and other
attachments thereto), including the applicable Secured Instruments, relating to
such Indebtedness to which the Borrower or any Subsidiary Loan Party is a party,
and (ii) delivering to the Collateral Agent a certificate of a Financial Officer
to the effect that such designation of such Indebtedness is not in contravention
of any Secured Instrument.  Upon completion of the actions described in clauses
(i) and (ii) of the preceding sentence, but subject to the following paragraph,
the Indebtedness designated by such Permitted Additional Obligations Designation
shall constitute Permitted Additional Obligations and the Holders thereof shall
constitute Secured Parties hereunder and shall be bound by the provisions
hereof.

          (b)  Notwithstanding anything herein to the contrary, (i) the Borrower
agrees that it will not incur any Indebtedness that would result in the total
outstanding Principal Obligations at any time exceeding $1,845,000,000 and (ii)
any purported designation of any Indebtedness as Permitted Additional
Obligations that would result in the total outstanding Principal Obligations
exceeding the limitation set forth in the foregoing clause (i) at the time of
such purported designation shall be null and void and of no force or effect.

          (c)  It is the intent of the parties that, after the date hereof, any
increase in the total amount of Principal Obligations and Secured Instrument
Commitments over the total amount thereof previously designated hereunder shall
require the execution and delivery of an additional Permitted Additional
Obligations Designation, notwithstanding that such additional Principal
Obligations
<PAGE>

or Secured Instrument Commitments are under the Credit Agreement, the Nortel
Credit Agreement or any other Credit Facility that was the subject of a previous
Permitted Additional Obligations Designation, but that any Indebtedness
resulting from loans advanced pursuant to a Secured Instrument Commitment that
was properly designated as Permitted Additional Obligations in accordance with
this Agreement (and in compliance with paragraph (b) above) at the time of
execution and delivery of the Permitted Additional Obligations Designation
relating thereto shall constitute Permitted Additional Obligations
notwithstanding any subsequent failure by the Borrower to comply with paragraph
(b) above.

          SECTION 2.02.  Additional Security Documents.  If the Borrower or any
                         ------------------------------
Subsidiary Loan Party is required by any Secured Instrument, Security Document
or other agreement to grant a security interest in or Lien on, or assignment of,
any assets (other than assets constituting Collateral under the Initial Security
Documents) of the Borrower or any Subsidiary Loan Party to secure any
Obligations, the Borrower shall, or shall cause the applicable Subsidiary Loan
Party or Subsidiary Loan Parties to, grant such security interest in or Lien on,
or assignment of, such assets to the Collateral Agent to secure all the
Obligations pursuant to an Additional Security Document.

                                  ARTICLE III

                           Acts of Secured Parties;
                           ------------------------
                            Amounts of Obligations
                            ----------------------
<PAGE>

          SECTION 3.01.  Acts of Secured Parties.  Any  request, demand,
                         ------------------------
authorization, direction, notice, consent, waiver or other action permitted or
required by this Agreement to be given or taken by any Secured Party, the
Required Secured Parties, the Required Non-Vendor Secured Parties, the Required
Committed Credit Facility Parties or the Required Credit Facility Parties with
respect to any Credit Facility or the Required Committed Secured Parties may be
and, at the request of the Collateral Agent, shall be embodied in and evidenced
by one or more instruments reasonably satisfactory in form to the Collateral
Agent and signed by such Secured Party or its Representative or the Required
Secured Parties, the Required Non-Vendor Secured Parties, the Required Committed
Credit Facility Parties or the Required Credit Facility Parties with respect to
any Credit Facility or the Required Committed Secured Parties or their
Representatives (as applicable) and, except as otherwise expressly provided in
any such instrument, any such action shall become effective when such instrument
or instruments shall have been delivered to the Collateral Agent.  The
instrument or instruments evidencing any action (and the action embodied therein
and evidenced thereby) are sometimes referred to herein as an "Act" of the
                                                               ---
Persons signing such instrument or instruments.  The Collateral Agent shall be
entitled to rely absolutely upon (a) an Act of any Representative if such Act
purports to be taken by or on behalf of the Secured Parties represented by such
Representative and (b) an Act of any Holder if such Act purports to be taken by
or on behalf of such Holder, and nothing in this Section 3.01 or elsewhere in
this Agreement shall be construed to require any Representative or Holder to
demonstrate that it has been authorized to take any action which it purports to
be taking, the Collateral Agent being entitled to rely conclusively, and being
fully protected in so relying, on any Act of such Representative or Holder.

          SECTION 3.02.  Determination of Amounts of Obligations.  Whenever the
                         ----------------------------------------
Collateral Agent is required to determine the existence or amount of any of the
Obligations or Secured Instrument Commitments or any portion thereof for any
purposes of this Agreement, it shall be entitled to make such determination on
the basis of one or more certificates of any applicable Representative or
Holder; provided that if, notwithstanding the request of the Collateral Agent,
        --------
any applicable Representative or Holder shall fail or refuse promptly to certify
as to the existence or amount of any Obligations or Secured Instrument
Commitments or any portion thereof, the
<PAGE>

Collateral Agent shall be entitled to determine such existence or amount by such
method as the Collateral Agent may, in its sole discretion exercised in good
faith, determine, including by reliance upon a certificate of the Borrower;
provided further that, promptly following determination of any such amount, the
----------------
Collateral Agent shall notify such Representative or Holder of such
determination and thereafter shall correct any error that such Representative or
Holder brings to the attention of the Collateral Agent. The Collateral Agent may
rely conclusively, and shall be fully protected in so relying, on any
determination made by it in accordance with the provisions of the preceding
sentence (or as otherwise directed by a court of competent jurisdiction) and
shall have no liability to the Borrower or any Secured Party or any other Person
as a result of any action taken by the Collateral Agent based upon such
determination prior to receipt of notice of any error in such determination.

          SECTION 3.03.  Restrictions on Actions.  Each Secured Party agrees
                         ------------------------
that, unless and until this Agreement is terminated as provided herein, the
provisions of this Agreement shall provide the exclusive method by which any
Secured Party may exercise, or direct the exercise of, rights and remedies under
the Support Documents.  Therefore, each Secured Party shall, for the mutual
benefit of all Secured Parties, except as permitted under this Agreement:

          (a) refrain from taking or filing any action, judicial or otherwise,
to enforce any rights or pursue any remedies under the Support Documents, except
for delivering notices hereunder; and

          (b) refrain from exercising any rights or remedies under the Support
Documents which may be exercisable as a result of an event that could result in
a Notice of Enforcement.

Except as specifically otherwise provided herein or in the Secured Instrument to
which a Secured Party is a party, however, any Secured Party or the Collateral
Agent, as applicable, may exercise any right or remedy available to it under any
Secured Instrument, any related agreement (other than the Support Documents) or
otherwise at law or in equity, including (i) imposing a default rate of interest
in accordance with the applicable Secured Instrument, (ii) exercising any right
or remedy or taking
<PAGE>

any other action that it is permitted or authorized to exercise or take or (iii)
exercising its rights and remedies as a general creditor in accordance with the
applicable Secured Instrument and applicable law, including the right to cease
advancing loans or otherwise extending credit to the Borrower, to commence legal
proceedings to collect any Obligation due and payable to such Secured Party and
remaining unpaid, to accelerate the maturity of any Obligations or to terminate
any Secured Instrument Commitment in accordance with the applicable Secured
Instrument, to commence legal proceedings (including involuntary bankruptcy
proceedings) to enforce any Secured Instrument and obtain a judgment and to
enforce such judgment, in each case to the same extent as if such Secured Party
were an unsecured creditor.

                                  ARTICLE IV

                          Duties of Collateral Agent
                          --------------------------

          SECTION 4.01.  Notice to Secured Parties.  The Collateral Agent shall
                         --------------------------
promptly notify each Representative and Unrepresented Holder in the event it
shall receive any Notice of Enforcement or any Notice of Cancelation of
Enforcement or any request by any party hereto or by any Loan Party for any
consent, waiver or amendment with respect hereto or any other Support Document.
Upon being notified by the Collateral Agent of any such Notice of Enforcement or
Notice of Cancelation of Enforcement, each Representative shall notify each
Secured Party that it represents of such Notice of Enforcement or Notice of
Cancelation of Enforcement.

          SECTION 4.02.  Actions Under Support Documents; Notices of
                         -------------------------------- ----------
Enforcement; Etc.  (a) The Collateral Agent shall not be obligated to take any
-----------------
action under this Agreement or any of the Support Documents except for the
performance of such duties as are specifically set forth herein or therein.

          (b)  A Notice of Enforcement may be delivered only by:

          (i)  the Required Secured Parties;

          (ii)  the Required Non-Vendor Secured Parties;
<PAGE>

     provided that, at the time such Notice of Enforcement is delivered, the
     --------
     aggregate amount of outstanding Principal Obligations held by all Non-
     Vendor Secured Parties is greater than or equal to the lesser of (A) 15% of
     the aggregate amount of outstanding Principal Obligations and (B)
     $50,000,000; or

           (iii)  the Required Credit Facility Parties under any Credit
     Facility; provided that, at the time such Notice of Enforcement is
               --------
     delivered, (A) the aggregate amount of outstanding Principal Obligations
     under such Credit Facility is greater than or equal to 15% of the aggregate
     amount of outstanding Principal Obligations, (B) the aggregate amount of
     outstanding Principal Obligations held by all Non-Vendor Secured Parties is
     less than the lesser of (1) 15% of the aggregate amount of outstanding
     Principal Obligations and (2) $50,000,000, and (C) an event of default has
     occurred and is continuing under such Credit Facility that permits the
     Obligations thereunder to be declared due and payable prior to the stated
     maturity thereof pursuant to the terms of such Credit Facility (or such
     Obligations have become due and payable and have not been paid) and a
     period of 90 days has lapsed during which such event of default has been
     continuing and has not been cured or waived (or such Obligations have not
     been paid, as the case may be).

               (c)  A Notice of Cancelation of Enforcement may be delivered only
by:

          (i)  the Required Secured Parties; provided that such Notice of
                                             --------
     Cancelation of Enforcement pertains to a Notice of Enforcement delivered by
     the Required Secured Parties;

          (ii)  the Required Non-Vendor Secured Parties; provided that, at the
                                                         --------
     time such Notice of Cancelation of Enforcement is delivered, the aggregate
     amount of outstanding Principal Obligations held by all Non-Vendor Secured
     Parties is greater than or equal to the lesser of (A) 15% of the aggregate
     amount of outstanding Principal Obligations and (B) $50,000,000; or
<PAGE>

          (iii)  the Required Credit Facility Parties under any Credit Facility;
     provided that such Notice of Cancelation of Enforcement pertains to a
     --------
     Notice of Enforcement delivered by the Required Credit Facility Parties
     under the same Credit Facility.

          (d)  Subject to the provisions of Article VII, the Collateral Agent
shall take any action under or with respect to the Support Documents which is
not inconsistent with or contrary to the provisions of this Agreement or any
other Support Document and which is in accordance with written instructions that
the Collateral Agent has received from:

     (i)  at any time when a Notice of Enforcement is in effect:

          (A)  the Required Secured Parties; provided that such instructions are
                                             --------
     not inconsistent with any written instructions given by the Required Non-
     Vendor Secured Parties if, at such time, the aggregate amount of
     outstanding Principal Obligations held by all Non-Vendor Secured Parties is
     greater than or equal to the lesser of (A) 15% of the aggregate amount of
     outstanding Principal Obligations and (B) $50,000,000;

          (B)  the Required Non-Vendor Secured Parties; provided that, at such
                                                        --------
     time, the aggregate amount of outstanding Principal Obligations held by all
     Non-Vendor Secured Parties is greater than or equal to the lesser of (A)
     15% of the aggregate amount of outstanding Principal Obligations and (B)
     $50,000,000; or

          (C)  subject to conflicting instructions that the Collateral Agent is
     required to follow pursuant to Section 4.03, the Required Credit Facility
     Parties under any Credit Facility; provided that such Notice of Enforcement
                                        --------
     was delivered by the Required Credit Facility Parties under the same Credit
     Facility; and

     (ii)  at any other time, the Required Committed Secured Parties.
<PAGE>

          (e)  The Collateral Agent may not exercise any remedy under Section 9-
505(2) of the Uniform Commercial Code, as in effect in any applicable
jurisdiction, except with the consent of each Secured Party affected thereby.

          SECTION 4.03.  Conflicting Instructions; No Instructions.  (a)  At any
                         ------------------------------------------
time when a Notice of Enforcement shall be in effect, the Collateral Agent
shall, subject in all cases to the provisions of Article VII, exercise or
refrain from exercising all such rights, powers and remedies as shall be
available to it under the Support Documents or any of them in accordance with
any written instructions received in accordance with Section 4.02(d)(i), subject
to paragraph (b) below, in the case of conflicting instructions received in
accordance with Section 4.02(d)(i).  Absent any such written instructions at a
time when a Notice of Enforcement shall be in effect, the Collateral Agent may
take, but shall have no obligation to take, any and all such actions under the
Support Documents or any of them or otherwise as it shall deem to be in the best
interests of the Secured Parties in order to maintain the Collateral and protect
and preserve the Collateral and the rights of the Secured Parties.

          (b)  At any time when a Notice of Enforcement shall be in effect, if
the Collateral Agent shall receive conflicting instructions given in accordance
with Section 4.02(d)(i) with respect to the exercise of remedies under or with
respect to the Support Documents:

     (i)  if such conflict shall occur with respect to whether or not to
     exercise such remedies, the Collateral Agent shall follow those
     instructions directing the Collateral Agent to exercise remedies; provided
                                                                       --------
     that the Collateral Agent shall follow instructions directing it not to
     exercise remedies received from the Required Non-Vendor Secured Parties if,
     at such time, the aggregate amount of outstanding Principal Obligations
     held by all Non-Vendor Secured Parties is greater than or equal to the
     lesser of (A) 15% of the aggregate amount of outstanding Principal
     Obligations and (B) $50,000,000; and

     (ii)  if such conflict shall occur with respect to the manner of
     exercising such remedies, the Collateral Agent shall follow the
     instructions of (A) the
<PAGE>

     Required Non-Vendor Secured Parties if, at such time, the aggregate amount
     of outstanding Principal Obligations held by all Non-Vendor Secured Parties
     is greater than or equal to the lesser of (1) 15% of the aggregate amount
     of outstanding Principal Obligations and (2) $50,000,000 or (B), if clause
     (A) does not apply (or if clause (A) does apply but the Required Non-Vendor
     Secured Parties shall fail to give instructions), the Required Secured
     Parties or (C) if the applicable Notice of Enforcement was given by the
     Required Credit Facility Secured Parties under a Credit Facility and
     clauses (A) and (B) above do not apply (or clause (A) or (B) above does
     apply but no instructions are given thereunder), then the Required Credit
     Facility Secured Parties under such Credit Facility, or (D) if clauses (A),
     (B) and (C) above do not apply (or any such clause does apply but no
     instructions are given thereunder), then the Representative or
     Unrepresented Holders representing the greatest amount of Principal
     Obligations then outstanding that shall have delivered instructions to the
     Collateral Agent.

Representatives and Unrepresented Holders giving instructions to the Collateral
Agent under this Section 4.03 shall do so in good faith and shall give such
instructions as shall have the effect of realizing on the Collateral and take
other available remedies under the Support Documents in a reasonably appropriate
and expeditious manner under the circumstances then applicable.

          SECTION 4.04.  Records.  (a)  The Collateral Agent shall maintain
                         --------
records regarding determinations of the amounts of the outstanding Obligations
and Secured Instrument Commitments for any purpose, any distributions from the
Collateral Accounts and any information received by the Collateral Agent
pursuant to Section 6.02.  The information contained in such records shall be
made available to any Secured Party upon request.

          (b)  The Collateral Agent shall maintain a record of the total
outstanding Principal Obligations and Secured Instrument Commitments at any time
in effect.  The Borrower shall promptly notify the Collateral Agent of any
change in the outstanding Principal Obligations or Secured Instrument
Commitments at any time, whether as a result of any termination or reduction of
such Secured Instrument Commitments, or any payment in respect of such Principal
<PAGE>

Obligations or otherwise.  The information contained in such records shall be
made available to any Secured Party upon request.  Any Secured Party shall be
entitled to rely upon such information.

                                   ARTICLE V

                      Collateral Accounts; Distributions
                      ----------------------------------

          SECTION 5.01.  The Collateral Accounts.  (a)  The Collateral Agent
                         ------------------------
shall establish and maintain at its office located at Two Avenue DeLefayette,
6th Floor, Boston, MA 02111-1724, three collateral accounts designated the
"Enforcement Collateral Account", the "Subordination Collateral Account" and the
-------------------------------        --------------------------------
"General Collateral Account", respectively (such collateral accounts,
 --------------------------
collectively, the "Collateral Accounts").
                   -------------------

          (b)  All amounts which are received by the Collateral Agent (in its
capacity as Collateral Agent) in respect of the Collateral, whether in
connection with the exercise of any right or remedy provided in this Agreement
or any other Support Document or otherwise (including all amounts received on
account of any sale of or other realization upon any of the Collateral pursuant
to any Security Document), or pursuant to enforcement of the Guarantee Agreement
or the Parent Guarantee Agreement, in each case while a Notice of Enforcement is
in effect shall be deposited in the Enforcement Collateral Account.  While a
Notice of Enforcement is in effect, all amounts on deposit in or required to be
deposited in the Subordination Collateral Account or the General Collateral
Account shall be transferred to the Enforcement Collateral Account.  Upon the
rescission of each effective Notice of Enforcement in accordance with the terms
hereof, the Collateral Agent shall (subject to the payment of any Obligations
then due in accordance with Section 5.02) release any funds then remaining on
deposit in the Enforcement Collateral Account to any Loan Party to the extent
required by any of the Security Documents; provided that such funds in an amount
                                           --------
equal to the sum of (x) the amount of General Funds transferred to the
Enforcement Collateral Account from the General Collateral Account pursuant to
paragraph (d) of this Section and (y) the amount of funds that would have been
deposited in the General Collateral Account pursuant to paragraph (d) of this
Section if a Notice of Enforcement had not been in effect, together with all
interest and
<PAGE>

income on such amounts, shall be deposited in the General Collateral Account for
application in accordance with the terms of paragraph (d) of this Section.

          (c)  All amounts which are received by the Collateral Agent (in its
capacity as Collateral Agent) pursuant to terms of the Subordination Agreement
shall be deposited in the Subordination Collateral Account.  While a Notice of
Enforcement is in effect, all amounts on deposit in or required to be deposited
in the Subordination Collateral Account shall be transferred to the Enforcement
Collateral Account.

          (d)  All amounts which are received by the Collateral Agent (in its
capacity as Collateral Agent) which by the terms of any Support Document or any
Secured Instrument are required to be held by the Collateral Agent (other than
amounts required to be deposited in the Enforcement Collateral Account or the
Subordination Collateral Account) shall be deposited in the General Collateral
Account.  While a Notice of Enforcement is in effect, all amounts on deposit in
or required to be deposited in the General Collateral Account shall be
transferred to the Enforcement Collateral Account.  The Borrower may, by
delivery to the Collateral Agent of a General Funds Release Request, request a
release of General Funds from the General Collateral Account in accordance with
the applicable provisions of the Support Document or Secured Instrument or
Secured Instruments which required such funds to be deposited with the
Collateral Agent (but only to the extent any funds in the General Collateral
Account were deposited in the General Collateral Account pursuant to such
agreements).  If no Notice of Enforcement is in effect on the date on which such
General Funds are requested to be released pursuant to the applicable General
Funds Release Request, the Collateral Agent shall release such General Funds in
accordance with such General Funds Release Request.  Pending the receipt by the
Collateral Agent of a General Funds Release Request with respect to any General
Funds or a transfer of such General Funds to the Enforcement Collateral Account
as provided above, the Collateral Agent shall invest such funds in Permitted
Investments (and the proceeds thereof and interest thereon shall constitute part
of such General Funds).

          (e)  All amounts deposited in the Collateral Accounts shall be held by
the Collateral Agent subject to the terms hereof and of the Support Documents
and shall
<PAGE>

constitute Collateral under the Security Agreement. No Loan Party shall have any
rights with respect to, and the Collateral Agent shall have exclusive dominion
and control over, the Collateral Accounts.

          SECTION 5.02.  Application of Proceeds.  Subject to Section 5.05, all
                         ------------------------
amounts deposited in the Enforcement Collateral Account shall be applied in the
following order of priority:

          FIRST, to the payment of all costs and expenses incurred by the
Collateral Agent (in its capacity as such hereunder or any other Support
Document) in connection with any Support Document or any of the Obligations,
including all court costs and the fees and expenses of its agents and legal
counsel, the repayment of all advances made by the Collateral Agent under any
Support Document on behalf of any Loan Party and any other costs and expenses
incurred in connection with the exercise of any right or remedy hereunder or
under any other Support Document;

          SECOND, to the Secured Parties pro rata in accordance with the
aggregate amounts of the Obligations outstanding on the date of any such
distribution (whether or not due and payable); and

          THIRD, the balance, if any, to the Borrower or its successors and
assigns, or such other Person or Persons as shall be entitled thereto, or as a
court of competent jurisdiction may otherwise direct.

          SECTION 5.03.  Time of Payments.  All distributions under Section 5.02
                         -----------------
shall be made by the Collateral Agent reasonably promptly after its receipts of
the applicable funds, subject to Section 5.04.

          SECTION 5.04.  Application of Amounts Not Distributable.  If any
                         -----------------------------------------
Representative or Unrepresented Holder shall inform the Collateral Agent in
writing that no provision is made under the relevant Secured Instrument for the
application of amounts which are to be distributed in respect of Obligations
under such Secured Instrument pursuant to Section 5.02 (whether by virtue of the
applicable Obligations thereunder not being then due and payable or otherwise)
or for the holding of such amounts by or on behalf of such parties pending
application thereof, then the Collateral Agent shall invest such amounts in
Permitted Investments and shall hold such amounts and all proceeds thereof in
the Enforcement Collateral Account, solely for the Secured Parties represented
by such Representative or such Unrepresented Holder, as the case may be, until
such Representative or Unrepresented Holder shall notify the Collateral Agent
that such Obligations have been paid (in which case such amounts and all
<PAGE>

proceeds thereof shall be applied in accordance with the provisions of Section
5.02) or shall request the delivery thereof by the Collateral Agent for
application pursuant to such Secured Instrument.

          SECTION 5.05.  Treatment of Contingent Obligations.  Notwithstanding
                         ------------------------------------
the foregoing, distributions under clause SECOND of Section 5.02 shall be made
disregarding any Contingent Obligations.  If any Contingent Obligations exist at
any time that any amounts are to be distributed to the Borrower under clause
THIRD of Section 5.02, the Collateral Agent shall deposit such amounts up to an
amount equal to such Contingent Obligations in a collateral account established
and maintained at its office located at Two Avenue DeLefayette, 6th Floor,
Boston, MA 02111-1724 (designated the "Contingent Obligations Collateral
                                       ---------------------------------
Account") for the benefit of the Secured Parties that have a claim with respect
to such Contingent Obligations.  The Collateral Agent shall invest such amounts
in Permitted Investments until the Representative of such Secured Parties or the
applicable Unrepresented Holder, as the case may be, shall notify the Collateral
Agent that any or all of the Contingent Obligations with respect to the Secured
Parties represented by such Representative or such Unrepresented Holder, as the
case may be, have become fixed or liquidated (in which case such amounts up to
the amount in the Contingent Obligations Collateral Account shall be delivered
to such Representative or Unrepresented Holder, as the case may be, to be
applied pursuant to the applicable Secured Instrument) or that such Contingent
Obligations have expired or cease to exist (in which case an amount in the
Contingent Obligations Collateral Account in excess of the Contingent
Obligations outstanding at such time shall be applied in accordance with the
provisions of Section 5.02).

          SECTION 5.06.  Collateral Agent's Calculations.  In making the
                         --------------------------------
determinations and allocations required by Section 5.02, the Collateral Agent
may rely upon  certificates as provided in Section 3.02, as to the amounts
payable with respect to Obligations.  If any Secured Party receives any amount
pursuant to Section 5.02 in excess of
<PAGE>

the amount it was entitled to receive pursuant to Section 5.02 as a result of a
demonstrable error in the determination of the amount of the Obligations, then
such Secured Party (by becoming a Holder of Obligations and accepting the
benefits of this Agreement) agrees to pay such excess to the Collateral Agent
for application in accordance with Section 5.02 as soon as practicable after the
existence of such error shall have been determined. All distributions made by
the Collateral Agent pursuant to Section 5.02 shall be (subject to the preceding
sentence and to any decree of any court of competent jurisdiction and to the
preceding sentence) final, and the Collateral Agent shall have no duty to
inquire as to the application by any Representative or Unrepresented Holder of
any amounts distributed to them.

                                  ARTICLE VI

                                  Agreements
                                  ----------

          SECTION 6.01.  Delivery of Agreements.  The Borrower shall deliver to
                         -----------------------
the Collateral Agent, promptly upon the execution thereof, true and complete
copies of (a) all amendments, supplements or other modifications to any Secured
Instrument and (b) each Additional Security Document.

          SECTION 6.02.  Information.  On a quarterly basis promptly following
                         ------------
the end of each calendar quarter, and from time to time upon the request of the
Collateral Agent (which request may be made by the Collateral Agent at the
reasonable direction of any Secured Party), the Borrower shall promptly deliver
to the Collateral Agent a list, setting forth as of a specified date not more
than 10 days prior to the date of delivery, of the aggregate outstanding
Obligations and Secured Instrument Commitments and the name and address of each
Secured Party (and the name and address of such Secured Party's Representative,
if any) and the respective amounts of Obligations and Secured Instrument
Commitments attributable to each.  The Collateral Agent shall provide a copy of
the most recent list delivered to it under this Section to any Secured Party
upon request.
<PAGE>

                                  ARTICLE VII

                             The Collateral Agent
                             --------------------

          SECTION 7.01.  Appointment; Rights and Duties.      (a)  Each of the
                         -------------------------------
Secured Parties hereby irrevocably appoints the Collateral Agent as its agent
and authorizes the Collateral Agent to take such actions on its behalf and to
exercise such powers as are delegated to the Collateral Agent by the terms of
the Support Documents, together with such actions and powers as are reasonably
incidental thereto.

          (b)  Any Person serving as the Collateral Agent hereunder shall have
the same rights and powers in its capacity as a Secured Party as any other
Secured Party and may exercise the same as though it were not the Collateral
Agent, and such Person and its Affiliates may accept deposits from, lend money
to and generally engage in any kind of business with the Borrower or any
Subsidiary or other Affiliate thereof as if it were not the Collateral Agent
hereunder.

          (c)  The Collateral Agent shall not have any duties or obligations
except those expressly set forth in the Support Documents.  Without limiting the
generality of the foregoing, (i) the Collateral Agent shall not be subject to
any fiduciary or other implied duties, regardless of whether a Notice of
Enforcement is in effect, (ii) the Collateral Agent shall not have any duty to
take any discretionary action or exercise any discretionary powers, except
discretionary rights and powers expressly contemplated by the Support Documents
that the Collateral Agent is required to exercise in writing by the Required
Secured Parties, and (iii) except as expressly set forth in the Support
Documents, the Collateral Agent shall not have any duty to disclose, and shall
not be liable for the failure to disclose, any information relating to the
Parent, Holdings, the Borrower or the Subsidiary Loan Parties that is
communicated to or obtained by the Person serving as the Collateral Agent or any
of its Affiliates in any capacity.  The Collateral Agent shall not be liable for
any action taken or not taken by it with the consent or at the request of the
Secured Parties (or the requisite portion thereof as required by any applicable
provision of this Agreement) or in the absence of its own gross negligence or
wilful misconduct.  The Collateral Agent shall be deemed not to have knowledge
of any event that could result in a Notice of Enforcement unless and until a
Notice of Enforcement is given to the Collateral Agent, and the Collateral Agent
shall not be responsible for or have
<PAGE>

any duty to ascertain or inquire into (A) any statement, warranty or
representation made in or in connection with any Support Document or Secured
Instrument, (B) the contents of any certificate, report or other document
delivered thereunder or in connection therewith, (C) the performance or
observance of any of the covenants, agreements or other terms or conditions set
forth in any Support Document or Secured Instrument, (D) the validity,
enforceability, effectiveness or genuineness of any Support Document or Secured
Instrument or any other agreement, instrument or document, or (E) the
satisfaction of any condition set forth in any Support Document or Secured
Instrument, other than to confirm receipt of items expressly required to be
delivered to the Collateral Agent.

          (d)  The Collateral Agent shall be entitled to rely upon, and shall
not incur any liability for relying upon, any notice, request, certificate,
consent, statement, instrument, document or other writing believed by it to be
genuine and to have been signed or sent by the proper Person.  The Collateral
Agent also may rely upon any statement made to it orally or by telephone and
believed by it to be made by the proper Person, and shall not incur any
liability for relying thereon.  The Collateral Agent may consult with legal
counsel (who may be counsel for the Parent or the Borrower), independent
accountants and other experts selected by it, and shall not be liable for any
action taken or not taken by it in accordance with the advice of any such
counsel, accountants or experts.

          (e)  The Collateral Agent may perform any and all its duties and
exercise its rights and powers by or through any one or more sub-agents
appointed by the Collateral Agent.  The Collateral Agent and any such sub-agent
may perform any and all its duties and exercise its rights and powers through
their respective Related Parties.  The exculpatory provisions of the preceding
paragraphs shall apply to any such sub-agent and to the Related Parties of the
Collateral Agent and any such sub-agent, and shall apply to their respective
activities in connection with the activities as Collateral Agent.

          (f)  Subject to the appointment and acceptance of a successor
Collateral Agent as provided in this paragraph, the Collateral Agent may resign
at any time by notifying each Secured Party and the Borrower.  Upon any such
resignation, the Required Committed Secured Parties (or, at any time when a
Notice of Enforcement is in effect, the
<PAGE>

Required Secured Parties) shall have the right to appoint a successor. If no
successor shall have been so appointed by the Required Committed Secured Parties
(or, if applicable, the Required Secured Parties) and shall have accepted such
appointment within 30 days after the retiring Collateral Agent gives notice of
its resignation, then the retiring Collateral Agent may, on behalf of the
Secured Parties, appoint a successor Collateral Agent which shall be a bank with
an office in New York, New York or an Affiliate of any such bank. Upon the
acceptance of its appointment as Collateral Agent hereunder by a successor, such
successor shall succeed to and become vested with all the rights, powers,
privileges and duties of the retiring Collateral Agent, and the retiring
Collateral Agent shall be discharged from its duties and obligations hereunder.
The fees payable by the Borrower to a successor Collateral Agent shall be the
same as those payable to its predecessor unless otherwise agreed between the
Borrower and such successor. After the Collateral Agent's resignation hereunder,
the provisions of this Article shall continue in effect for the benefit of such
retiring Collateral Agent, its sub-agents and their respective Related Parties
in respect of any actions taken or omitted to be taken by any of them while it
was acting as Collateral Agent.

          (g)  Each Secured Party acknowledges that it has, independently and
without reliance upon the Collateral Agent or any other Secured Party and based
on such documents and information as it has deemed appropriate, made its own
credit analysis and decision to extend credit to the Borrower pursuant to the
applicable Secured Instrument and enter into this Agreement.  Each Secured Party
also acknowledges that it will, independently and without reliance upon the
Collateral Agent or any other Secured Party and based on such documents and
information as it shall from time to time deem appropriate, continue to make its
own decisions in taking or not taking action under or based upon this Agreement,
any other Support Document or related agreement or any document furnished
hereunder or thereunder.

          SECTION 7.02.  Expenses; Indemnity; Damage Waiver.      (a)  The
                         -----------------------------------
Borrower shall pay (i) all costs and expenses incurred by the Collateral Agent,
including the fees, charges and disbursements of counsel for the Collateral
Agent, in connection with the negotiation, preparation, execution and delivery
of the Support Documents, and (ii) all costs and expenses incurred by the
<PAGE>

Collateral Agent, including the fees, charges and disbursements of any counsel,
consultants or appraisers for the Collateral Agent, in connection with (A) the
enforcement or protection of its rights in connection with the Support
Documents, including its rights under this Section and (B) the administration
of, and any amendments, modifications, waivers or supplements of or to the
provisions of, any of the Support Documents.

          (b)  The Borrower shall indemnify the Collateral Agent and each of its
Related Parties (each such Person being called an "Indemnitee") against, and
                                                   ----------
hold each Indemnitee harmless from, any and all losses, claims, damages,
liabilities and related expenses, including the fees, charges and disbursements
of any counsel for any Indemnitee, incurred by or asserted against any
Indemnitee arising out of, in connection with, or as a result of (i) the
execution or delivery of any Support Document or Secured Instrument or any other
agreement or instrument contemplated hereby, or the performance by the parties
to the Support Documents or Secured Instruments of their respective obligations
thereunder, (ii) any extension of credit under any Secured Instrument or the use
of the proceeds therefrom, (iii) any actual or alleged presence or release of
Hazardous Materials on or from any property owned or operated by the Borrower or
any of the Subsidiary Loan Parties or at which any Collateral is located, or any
Environmental Liability related in any way to the Borrower or any of the
Subsidiary Loan Parties, or (iv) any actual or prospective claim, litigation,
investigation or proceeding relating to any of the foregoing, whether based on
contract, tort or any other theory and regardless of whether any Indemnitee is a
party thereto; provided that such indemnity shall not, as to any Indemnitee, be
               --------
available to the extent that such losses, claims, damages, liabilities or
related expenses have resulted from the gross negligence or wilful misconduct of
such Indemnitee.

          (c)  To the extent that the Borrower fails to pay any amount required
to be paid by it to the Collateral Agent under paragraph (a) or (b) of this
Section, each Secured Party severally agrees to pay to the Collateral Agent such
Secured Party's pro rata share (determined as of the time that the applicable
unreimbursed expense or indemnity payment is sought) of such unpaid amount;
provided that the unreimbursed expense or indemnified loss, claim, damage,
--------
liability or related expense, as the case may be, was incurred by or asserted
against the Collateral
<PAGE>

Agent in its capacity as such. For purposes hereof, a Secured Party's pro rata
share shall be determined based upon its share of the aggregate amount of
outstanding Principal Obligations and Secured Instrument Commitments at the
time.

          (d)  To the extent permitted by applicable law, the Borrower shall not
assert, and hereby waives, any claim against any Indemnitee, on any theory of
liability, for special, indirect, consequential or punitive damages (as opposed
to direct or actual damages) arising out of, in connection with, or as a result
of, this Agreement or any agreement or instrument contemplated hereby.

          (e)  All amounts due under this Section shall be payable not later
than 30 days after written demand therefor.

                                 ARTICLE VIII

                        Representations and Warranties
                        ------------------------------

          The Borrower represents and warrants to the Secured Parties that:

          SECTION 8.01.  Organization; Powers.  Each Loan Party is duly
                         ---------------------
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization, has all requisite power and authority to carry
on its business as now conducted and, except where the failure to do so,
individually or in the aggregate, could not reasonably be expected to result in
a material adverse effect of the Borrower and the Subsidiary Loan Parties taken
as a whole, is qualified to do business in, and is in good standing in, every
jurisdiction where such qualification is required.

          SECTION 8.02.  Authorization; Enforceability.  The execution delivery
                         ------------------------------
and performance by each Loan Party of the Support Documents to which it is a
party are within such Loan Party's corporate powers and have been duly
authorized by all necessary company or corporate, as the case may be, and, if
required, stockholder action.  This Agreement and each other Support Document
has been duly executed and delivered by each Loan Party that is a party thereto
and constitutes a legal, valid and binding obligation of such Loan Party (as the
case may be), enforceable in accordance with its terms, subject to
<PAGE>

applicable bankruptcy, insolvency, reorganization, moratorium or other laws
affecting creditors' rights generally and subject to general principles of
equity, regardless of whether considered in a proceeding in equity or at law.

          SECTION 8.03.  Governmental Approvals; No Conflicts.  The execution,
                         -------------------------------------
delivery and performance by each Loan Party of the Support Documents to which it
is a party (a) do not require any consent or approval of, registration or filing
with, or any other action by, any Governmental Authority, except such as have
been obtained or made and are in full force and effect and except filings
necessary to perfect Liens created under the Security Documents, (b) will not
violate any applicable law or regulation or the charter, by-laws or other
organizational documents of any Loan Party or any order of any Governmental
Authority, (c) will not violate or result in a default under any indenture,
agreement or other instrument binding upon any Loan Party or its assets, or give
rise to a right thereunder to require any payment to be made by any Loan Party,
and (d) will not result in the creation or imposition of any Lien on any asset
of any Loan Party, except Liens created under the Security Documents.

                                  ARTICLE IX

                          Intercreditor Arrangements
                          --------------------------

          SECTION 9.01.  Security Interests.  The Collateral Agent and each of
                         -------------------
the Secured Parties hereby agree that the Liens and security interests granted
to the Collateral Agent under the Security Documents, and the Guarantees
provided under the Guarantee Agreement and the Parent Guarantee Agreement, and
the other rights, remedies, powers and privileges under the Support Documents
shall be treated, as among the Secured Parties, as having equal priority and
shall at all times be shared by the Secured Parties as provided herein.

          SECTION 9.02.  Turnover of Collateral and Certain Payments.  If any
                         --------------------------------------------
Secured Party (i) acquires custody, control or possession of any Collateral or
proceeds therefrom or (ii) receives any payment pursuant to enforcement of the
Guarantee Agreement or the Parent Guarantee Agreement, in each case other than
pursuant to the terms of this Agreement, then such Secured Party shall promptly
cause such Collateral, proceeds or payments to be
<PAGE>

delivered to or put in the custody, possession or control of the Collateral
Agent for disposition or distribution in accordance with the provisions of
Article V. Until such time as the provisions of the immediately preceding
sentence have been complied with, such Secured Party shall be deemed to hold
such Collateral, proceeds or payments in trust for the parties entitled thereto
hereunder. Notwithstanding the foregoing, but subject to the requirements of
Sections 9.07 and 9.08, no Secured Party shall be required to deliver to or put
in the custody, possession or control of the Collateral Agent or to hold in
trust as specified in the preceding sentence any amount of any Obligation paid
or prepaid by the Borrower to it (and not obtained by it through any sale of or
other realization upon any Collateral or by enforcement of its rights under the
Guarantee Agreement or the Parent Guarantee Agreement as provided herein and in
the Support Documents) in accordance with the terms of the applicable Secured
Instrument.

          SECTION 9.03.  Release of Collateral and Guarantees.  (a)  In
                         -------------------------------------
connection with any sale, transfer or disposition of any Collateral to any
Person other than the Borrower or any Subsidiary Loan Party that does not
violate any Secured Instrument, the Secured Parties agree that any Liens on such
Collateral created pursuant to the Security Documents will be released upon the
delivery of evidence satisfactory to the Collateral Agent that such sale,
transfer or disposition (and the release of such Liens and, if applicable, any
guarantee of the Obligations) is in compliance with the requirements of each
Secured Instrument (including a certificate from a Financial Officer to such
effect).  In the event any such sale, transfer or disposition to a Person other
than the Parent or any subsidiary thereof (including the Borrower or any
Subsidiary Loan Party) shall be of 100% of the Equity Interests of a Subsidiary
Loan Party, the Secured Parties hereby authorize the Collateral Agent upon the
delivery of such evidence to release such Subsidiary and its assets from its
obligations under and the Liens created by the Support Documents and to execute
amendments, releases and other documents in form and substance satisfactory to
the Collateral Agent confirming such release.

          (b)  Collateral may be released in connection with the exercise of any
rights, powers or remedies by the Collateral Agent pursuant to and in accordance
with Section
<PAGE>

4.02 and such release shall not require any approval under this Section.

          (c)  The Secured Parties hereby authorize the Collateral Agent to
execute releases and other documents in form and substance satisfactory to the
Collateral Agent in respect of any release of Collateral permitted under this
Section.

          SECTION 9.04.  Additional Collateral.  Each of the Secured Parties
                         ----------------------
hereby covenants and agrees that it (a) will not accept any Guarantee of any of
the Obligations by any Loan Party or an Affiliate thereof or any Person
providing such Guarantee on behalf of a Loan Party or an Affiliate thereof
unless such Person's Guarantee is provided pursuant to the Guarantee Agreement
or the Parent Guarantee Agreement or otherwise Guarantees the payment of all the
Obligations on a pari passu basis and (b) will not take any security interest in
                 ---- -----
or Lien on or assignment of any assets to secure any of the Obligations unless
such security interest or Lien or assignment is granted to the Collateral Agent
to secure the payment of all the Obligations on a pari passu basis pursuant to
                                                  ---- -----
an Additional Security Document; provided that the foregoing shall not apply to
                                 --------
any insurance or other credit support acquired by a Secured Party at its own
expense from a Person (other than any Loan Party or an Affiliate thereof or a
Person acting on behalf of a Loan Party or an Affiliate thereof) with respect to
the Obligations.

          SECTION 9.05.  Purchase of Collateral.  Any Secured Party may purchase
                         -----------------------
Collateral at any public sale of such Collateral pursuant to any of the Security
Documents and to the extent, but only to the extent, approved by the Required
Secured Parties (determined for this purpose without giving effect to the
Obligations owed to the Secured Party that is making such purchase, unless it is
the only Holder at the time) may make payment on account thereof by using any
Obligation then due and payable to such Secured Party from the Person which
granted a security interest in such Collateral as a credit against the purchase
price.

          SECTION 9.06.  Further Assurances, etc.  Each party hereto shall
                         ------------------------
execute and deliver such other documents and instruments, in form and substance
reasonably satisfactory to the other parties hereto, and shall take such other
action, in each case as any other party hereto
<PAGE>

may reasonably have requested (at the cost and expense of the Borrower which
agrees to pay such costs and expenses), to effectuate and carry out the
provisions of this Agreement and the other Support Documents, including by
recording or filing in such places as the requesting party may deem desirable,
this Agreement or such other documents or instruments.

          SECTION 9.07.  Restrictions on Prepayments and Purchases of
                         --------------------------------------------
Indebtedness.  If on any date the Borrower:
-------------

          (a) shall prepay or purchase any Indebtedness outstanding under any
Secured Instrument; and

          (b) shall not prepay or purchase the Indebtedness outstanding under
all Secured Instruments ratably in accordance with the respective aggregate
principal amount then outstanding thereunder;

any Secured Party that shall have had its Indebtedness so prepaid or purchased
in an amount in excess of that which it would have received if the Borrower had
made prepayments or purchases ratably in respect of all Secured Parties will, on
behalf of the Borrower, pay any excess amount received by it ratably to the
other Secured Parties entitled thereto in order to prepay or purchase on behalf
of the Borrower the Indebtedness of such other Secured Parties (and any such
excess so paid by any Secured Party shall be deemed not to have been paid by the
Borrower to such Secured Party).  The Borrower irrevocably authorizes and
directs each Secured Party to take the actions on its behalf specified in this
Section 9.07.

          SECTION 9.08.  Payment of Amounts Owing under Secured Instruments.  If
                         ---------------------------------------------------
on any date:

          (a) any amount shall be due and owing under more than one Secured
Instrument;

          (b) the Borrower shall not pay all such amounts as are then due and
owing; and

          (c) the Borrower shall not pay such amounts ratably, in accordance
with the respective amounts then due and owing thereunder;

any Secured Party that shall have been paid an amount in excess of the payment
that it would have received if the
<PAGE>

Borrower had paid amounts owing by it ratably will, on behalf of the Borrower,
pay such excess ratably to the other Secured Parties entitled thereto (and any
such excess so paid by any Secured Party shall be deemed not to have been paid
by the Borrower to such Secured Party); provided that, if a Notice of
                                        --------
Enforcement is in effect as of such date, then, for all purposes of this Section
9.08, all outstanding Obligations shall be deemed due and owing whether or not
they are actually due and owing (e.g., whether or not the maturity of such
                                 ----
Obligations has been accelerated or otherwise matured). The Borrower irrevocably
authorizes and directs each Secured Party to take the actions on its behalf
specified in this Section 9.08.

          SECTION 9.09.  Certain Amendments to Credit Agreement.
                         --------------------------------------
Notwithstanding any provision to the contrary in the Credit Agreement, no
amendment or waiver of any encumbrance or restriction in the Credit Agreement on
the ability of the Borrower, Holdings or any Subsidiary Loan Party to:

          (i) pay dividends or make any other distributions permitted by
     applicable law on any Equity Interest of the Borrower, Holdings or any
     Subsidiary Loan Party;

          (ii) pay any Indebtedness owed to the Parent or any subsidiary of the
     Parent;

          (iii) make loans or advances to the Parent or any subsidiary of the
     Parent; or

          (iv) transfer any of its property or assets to the Parent or any
     subsidiary of the Parent,

shall be effective unless the Required Committed Credit Facility Parties under
each Credit Facility shall have consented to such amendment or waiver.

          SECTION 9.10.  Payments under ChaseTel Subordination Agreement.  If
                         ------------------------------------------------
any Lender or the Administrative Agent receives any payments under the ChaseTel
Subordination Agreement, then such Lender or the Administrative Agent shall
share the benefits of such payments ratably with the other Secured Parties by
either (a) payment to the Collateral Agent for distribution under
<PAGE>

Section 5.02, if permitted, or (b) applying such payment to pay Credit Facility
Obligations and then purchasing participations in the Principal Obligations then
outstanding of the other Secured Parties to the extent necessary so that the
benefit of all such payments shall be shared by all Secured Parties ratably in
accordance with the aggregate amount of Principal Obligations then outstanding.

                                   ARTICLE X

                             Benefit of Agreement
                             --------------------

          This Agreement is being executed and delivered by the Persons whose
names appear on the signature pages below and by such other Persons as become
parties hereto by the execution and delivery of a Permitted Additional
Obligations Designation pursuant to Section 2.01 and by accepting and assuming
the rights, benefits, duties and obligations of a Secured Party hereunder as
provided in such Section and such Permitted Additional Obligations Designation,
but shall benefit, in addition to such Persons, each other Secured Party
represented by a Representative (including the Lenders and the Nortel Lenders).

                                  ARTICLE XI

                                 Miscellaneous
                                 -------------

          SECTION 11.01.  Notices.  Except in the case of notices and other
                          --------
communications expressly permitted to be given by telephone, all notices and
other communications provided for herein shall be in writing and shall be
delivered by hand or overnight courier service, mailed by certified or
registered mail or sent by telecopy, as follows:

          (a) if to the Borrower, to it at 10307 Pacific Center Court, San
Diego, California 92121, Attention of President (Telecopy No. (619) 882-6010);

          (b) if to the Collateral Agent, to it at Two Avenue DeLefayette, 6th
Floor, Boston, MA 02111-1724, Attention of Patrick Thibedeau (Telecopy No. 617-
662-1460);
<PAGE>

          (c) if to the Administrative Agent, to it at 600 Mountain Avenue,
Murray Hill, New Jersey 07974, Attention of Assistant Treasurer-Project Finance
(Telecopy No. (908) 582-3101);

          (d) if to the Nortel Agent, to it at Nortel Networks Inc., Mail Stop
991 15 A40, 2221 Lakeside Blvd., Richardson, Texas 75082-4399, Attention of
Robert D. Beiter, Director, Customer Finance North America (Telecopy No. (972)
684-3679); and

          (e) if to any other Secured Party, to it at its address (or telecopy
number) set forth in the applicable Permitted Additional Obligation Designation.

Any party hereto may change its address or telecopy number for notices and other
communications hereunder by notice to the other parties hereto.  All notices and
other communications given to any party hereto in accordance with the provisions
of this Agreement shall be deemed to have been given on the date of receipt.

          SECTION 11.02.  Waivers; Amendments.  (a)  No failure or delay by the
                          --------------------
Collateral Agent in exercising any right or power hereunder or under any other
Support Document shall operate as a waiver thereof, nor shall any single or
partial exercise of any such right or power, or any abandonment or
discontinuance of steps to enforce such a right or power, preclude any other or
further exercise thereof or the exercise of any other right or power.  The
rights and remedies of the Collateral Agent hereunder and under the other
Support Documents are cumulative and are not exclusive of any rights or remedies
that it would otherwise have.  No waiver of any provision of any Support
Document or consent to any departure by any Loan Party therefrom shall in any
event be effective unless the same shall be permitted by paragraph (b) of this
Section, and then such waiver or consent shall be effective only in the specific
instance and for the purpose for which given.

          (b)  Neither this Agreement nor any other Support Document nor any
provision hereof or thereof may be waived, amended or modified except, in the
case of this Agreement, pursuant to an agreement or agreements in writing
entered into by the Borrower and the Representatives and/or Unrepresented
Holders representing the Required Committed Secured Parties (or, at any time
when a Notice of Enforcement is in effect, the Required Secured Parties) and
<PAGE>

the Required Committed Credit Facility Parties in respect of each Credit
Facility or, in the case of any other Support Document, pursuant to an agreement
or agreements in writing entered into by the Collateral Agent and the Loan Party
or Loan Parties that are parties thereto with the consent of the Required
Committed Secured Parties (or, at any time when a Notice of Enforcement is in
effect, the Required Secured Parties) and the Required Committed Credit Facility
Parties in respect of each Credit Facility; provided that no such agreement
                                            --------
shall (i) adversely affect any of the Collateral Agent's rights, immunities or
rights to indemnification hereunder or under any Support Document or expand its
duties hereunder or under any Support Document, without the prior written
consent of the Collateral Agent, (ii) modify any provision hereof which is
intended to provide for the equal and ratable security of all Obligations
without the prior written consent of all Secured Parties, (iii) release all or
any substantial part of the Collateral from the Liens of the Security Documents
(except as expressly provided in Section 9.03), without the prior written
consent of each Secured Party, (iv) release Holdings, any Subsidiary Loan Party
or the Parent from its Guarantee under the Guarantee Agreement or the Parent
Guarantee Agreement (except as expressly provided in Section 9.03) or limit or
condition its obligations thereunder, without the prior written consent of each
Secured Party, or (v) change the definitions of "Credit Facility Obligations",
"Nortel Facility Obligations", "Obligations", "Permitted Additional
Obligations", "Required Committed Secured Parties", "Required Credit Facility
Parties", "Required Non-Vendor Secured Parties", "Required Secured Parties" or
this Section, Section 4.02, Section 4.03 or Section 9.03 without the prior
written consent of each Secured Party. Notwithstanding the foregoing, the
Collateral Agent and the Borrower and, in the case of the Guarantee Agreement or
the Parent Guarantee Agreement, any guarantor party to the Guarantee Agreement
or the Parent Guarantee Agreement, may enter into one or more agreements
supplemental to the applicable Support Documents, in form and substance
satisfactory to the Collateral Agent, to add any guarantor of the Obligations or
any grantor to any Security Document.

          SECTION 11.03.  Counterparts.  This Agreement may be executed in
                          -------------
counterparts (and by different parties hereto on different counterparts), each
of which shall constitute an original, but all of which when taken together
shall constitute a single contract.  Delivery of
<PAGE>

an executed counterpart of a signature page of this Agreement by telecopy shall
be effective as delivery of a manually executed counterpart of this Agreement.

          SECTION 11.04.  Severability.  Any provision of this Agreement held to
                          -------------
be invalid, illegal or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such invalidity, illegality or
unenforceability without affecting the validity, legality and enforceability of
the remaining provisions hereof; and the invalidity of a particular provision in
a particular jurisdiction shall not invalidate such provision in any other
jurisdiction.

          SECTION 11.05.  Governing Law; Jurisdiction; Consent to Service of
                          --------------------------------------------------
Process.  (a)  This Agreement shall be construed in accordance with and governed
--------
by the law of the State of New York.

          (b)  The Borrower hereby irrevocably and unconditionally submits, for
itself and its property, to the nonexclusive jurisdiction of the Supreme Court
of the State of New York sitting in New York County and of the United States
District Court of the Southern District of New York, and any appellate court
from any thereof, in any action or proceeding arising out of or relating to any
Support Document, or for recognition or enforcement of any judgment, and each of
the parties hereto hereby irrevocably and unconditionally agrees that all claims
in respect of any such action or proceeding may be heard and determined in such
New York State or, to the extent permitted by law, in such Federal court.  Each
of the parties hereto agrees that a final judgment in any such action or
proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on the judgment or in any other manner provided by law.  Nothing in this
Agreement or any other Support Document shall affect any right that the
Collateral Agent or any Secured Party may otherwise have to bring any action or
proceeding relating to this Agreement or any other Support Document against the
Borrower or their properties in the courts of any jurisdiction.

          (c)  The Borrower hereby irrevocably and unconditionally waives, to
the fullest extent it may legally and effectively do so, any objection which it
may now or hereafter have to the laying of venue of any suit, action or
proceeding arising out of or relating to this Agreement or any other Support
Document in any court
<PAGE>

referred to in paragraph (b) of this Section. Each of the parties hereto hereby
irrevocably waives, to the fullest extent permitted by law, the defense of an
inconvenient forum to the maintenance of such action or proceeding in any such
court.

          (d)  Each party to this Agreement irrevocably consents to service of
process in the manner provided for notices in Section 11.01.  Nothing in this
Agreement or any other Support Document will affect the right of any party to
this Agreement to serve process in any other manner permitted by law.

          SECTION 11.06.  WAIVER OF JURY TRIAL.  EACH PARTY HERETO HEREBY
                          ---------------------
WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE
TO A TRIAL BY JURY IN ANY LEGAL PROCEEDING DIRECTLY OR INDIRECTLY ARISING OUT OF
OR RELATING TO THIS AGREEMENT OR ANY OTHER SUPPORT DOCUMENT (WHETHER BASED ON
CONTRACT, TORT OR ANY OTHER THEORY).  EACH PARTY HERETO (A) CERTIFIES THAT NO
REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY
OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK
TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER
PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.

          SECTION 11.07.  Headings.  Article and Section headings used herein
                          ---------
are for convenience of reference only, are not part of this Agreement and shall
not affect the construction of, or be taken into consideration in interpreting,
this Agreement.

          SECTION 11.08.  Successors and Assigns.  (a)  Whenever in this
                          -----------------------
Agreement any of the parties hereto is referred to, such reference shall be
deemed to include the successors and assigns of such party (including, in the
case of any Secured Party, each transferee or assignee of Obligations held by
it).  Without limiting the generality of the foregoing, this Agreement shall be
binding upon each transferee or assignee of any Secured Party.

          (b)  The Borrower shall not assign or delegate any of its rights or
duties hereunder or any of its interest herein without the prior written consent
of each Secured Party, and any purported assignment or delegation in
contravention of this paragraph shall be void.
<PAGE>

          SECTION 11.09.  Termination.  This Agreement shall automatically
                          ------------
terminate when (i) the Liens and security interests granted under the Security
Documents have terminated and (ii) the Collateral has been released and the
Obligations have been indefeasibly paid and performed in full and all Secured
Instrument Commitments shall have terminated; provided that the provisions of
                                              --------
Section 7.02 shall not be affected by any such termination.

          SECTION 11.10.  Complete Agreement.  (a)  This Agreement constitutes
                          -------------------
the entire agreement between the parties hereto with respect to the subject
matter hereof and supersedes all prior representations, negotiations, writings,
memoranda and agreements.

          (b)  Upon the execution and delivery of counterparts of this Agreement
by the Borrower, the Collateral Agent and Representatives and Unrepresented
Holders representing each Secured Party as of the date hereof, the Existing
Agreement shall be superseded and amended and restated in the form of this
Agreement.
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed by their respective authorized officers as of the day and year
first above written.

                                         CRICKET COMMUNICATIONS, INC.
                                         (formerly known as Cricket
                                         Wireless Communications, Inc.),

                                          by  ________________________________
                                              Name:
                                              Title:

                                         STATE STREET BANK AND TRUST
                                         COMPANY, as Collateral Agent,

                                          by  ________________________________
                                              Name:
                                              Title:

                                         LUCENT TECHNOLOGIES INC.,
                                         individually and as
                                         Administrative Agent under the
                                         Credit Agreement,

                                          by  ________________________________
                                              Name:
                                              Title:

                                         NORTEL NETWORKS INC.,
                                         individually and as
                                         Administrative Agent under the
                                         Nortel Credit Agreement,

                                          by  ________________________________
                                              Name:
                                              Title:
<PAGE>

                                         SOCIETE GENERALE,

                                          by  ________________________________
                                              Name:
                                              Title:
<PAGE>

          The undersigned are parties to the other Support Documents and
acknowledge and agree to the changes thereto set forth herein and agree to be
bound by this Agreement.

                                      LEAP WIRELESS INTERNATIONAL, INC.

                                        by
                                           _______________________
                                           Name:
                                           Title:

                                      EACH SUBSIDIARY OF THE BORROWER

                                        by
                                           ________________________
                                           Name:
                                           Title:

                                      EACH LICENSE SUBSIDIARY PARTY
                                      TO THE OTHER SUPPORT
                                      DOCUMENTS,

                                        by
                                           _________________________
                                           Name:
                                           Title:
<PAGE>

                                                                       EXHIBIT A

                                    FORM OF
                 PERMITTED ADDITIONAL OBLIGATIONS DESIGNATION

                                                                          [Date]
To:  [        ], as Collateral Agent

Re:  Amended and Restated Collateral Agency and Intercreditor Agreement, dated
     as of [      ], 2000, among CRICKET COMMUNICATIONS, INC. (formerly known as
     Cricket Wireless Communications, Inc.), STATE STREET BANK AND TRUST
     COMPANY, as Collateral Agent, and the Representatives and Unrepresented
     Holders referred to therein (the "Collateral Agency and Intercreditor
     Agreement").

          Reference is hereby made to the Collateral Agency and Intercreditor
Agreement.  Capitalized terms which are defined in the Collateral Agency and
Intercreditor Agreement are used herein as therein defined.

          In accordance with Section 2.01 of the Collateral Agency and
Intercreditor Agreement, the following Indebtedness for borrowed money of the
Borrower are hereby added as Permitted Additional Obligations thereunder.

          [DESCRIBE INDEBTEDNESS]

Attached hereto is a true and complete copy of each agreement (together with all
schedules, exhibits, annexes, appendices and other attachments thereto),
constituting the applicable Secured Instruments relating to such Permitted
Additional Obligations.

          The undersigned is [the Secured Party] [the Representative of the
Secured Parties] in respect of such Permitted Additional Obligations and hereby
acknowledges receipt of a copy of the Collateral Agency and Intercreditor
Agreement.  [The undersigned agrees that, upon execution and delivery hereof, it
shall be a party to
<PAGE>

the Collateral Agency and Intercreditor Agent and shall have all the rights and
obligations of a Secured Party under the Collateral Agency and Intercreditor
Agreement in accordance with the terms thereof.] [The undersigned represents
that it has been appointed as the Representative under the Secured Instruments
referred to above on behalf of the Holders thereunder, with the power to become
a party to the Collateral Agency and Intercreditor Agreement on behalf of such
Holders, and by the undersigned's execution and delivery hereof, each such
Holder shall become a party to the Collateral Agency and Intercreditor Agreement
and shall have all the rights and obligations of a Secured Party under the
Collateral Agency and Intercreditor Agreement in accordance with the terms
thereof].

          All communications and notices under the Collateral Agency and
Intercreditor Agreement to the [Secured Party] [Representative and the Holders
under the Secured Instruments referred to above] shall be given to such Person
at the address set forth on Schedule I hereto.

[         ]

by
Name:
Title:

[Secured Party] [Representative]

by
Name:
Title:

CRICKET COMMUNICATIONS, INC.
(formerly known as Cricket Wireless
Communications, Inc.),

by
Name:
Title:
<PAGE>

                                                                      SCHEDULE I

                                ADDRESS[ES] OF
                        [SECURED PARTY] [REPRESENTATIVE
                             AND SECURED PARTIES]
<PAGE>

                                   Exhibit C
                                   ---------

               AMENDED AND RESTATED INDEMNITY, SUBROGATION and CONTRIBUTION
          AGREEMENT (this "Agreement") dated as of June ____, 2000, among
          CRICKET COMMUNICATIONS, INC. (formerly known as Cricket Wireless
          Communications, Inc.), a Delaware corporation (the "Borrower"), each
          subsidiary of the Borrower listed on Schedule I hereto (each a
          "Subsidiary", and, collectively, the "Subsidiaries"), each subsidiary
          of Leap Wireless International, Inc., a Delaware corporation (the
          "Parent") listed on Schedule I hereto (each a "License Subsidiary",
          and, collectively, the "License Subsidiaries"; each such Subsidiary
          and each such License Subsidiary individually, a "Guarantor" and,
          collectively, the "Guarantors") and STATE STREET BANK AND TRUST
          COMPANY, as collateral agent (in such capacity, and including its
          successors and assigns in such capacity, the "Collateral Agent") for
          the Secured Parties.

     Reference is made to (a) the Amended and Restated Collateral Agency and
Intercreditor Agreement dated as of June ____, 2000 (as amended, supplemented,
restated or otherwise modified from time to time, the "Collateral Agency and
Intercreditor Agreement") among the Borrower, the Representatives and
Unrepresented Holders referred to therein and the Collateral Agent and (b) the
Guarantee Agreement and the other Support Documents. Capitalized terms used
herein and not defined herein shall have the meanings assigned to such terms in
the Collateral Agency and Intercreditor Agreement. Each Guarantor acknowledges
receipt of a true and correct copy of the Collateral Agency and Intercreditor
Agreement and agrees to the terms thereof.

     The Lenders have agreed to make Loans to the Borrower pursuant to, and upon
the terms and subject to the conditions specified in, the Credit Agreements. The
Guarantors have guaranteed such Loans and the other Obligations pursuant to the
Guarantee Agreement; certain Guarantors have granted Liens on and security
interests in certain of their assets to secure the Obligations pursuant to the
Security Documents. The obligations of the Lenders to make Loans are conditioned
on, among other things, the execution and delivery by the Borrower, the
Guarantors and the Collateral Agent of an agreement in the form hereof. The
Borrower may from time to time incur Permitted Additional Obligations that are
required to be guaranteed pursuant to the Guarantee Agreement and secured under
the Security Documents.

     Accordingly, the Borrower, each Guarantor and the Collateral Agent, on
behalf of itself and each Secured Party (and each of their respective successors
or assigns), hereby agree as follows:

                                       8
<PAGE>

     SECTION 1. Indemnity and Subrogation.  In addition to all such rights of
                -------------------------
indemnity and subrogation as the Guarantors may have under applicable law (but
subject to Section 3), the Borrower agrees that (a) in the event a payment shall
be made by any Guarantor under the Guarantee Agreement, the Borrower shall
indemnify such Guarantor for the full amount of such payment and such Guarantor
shall be subrogated to the rights of the Person to whom such payment shall have
been made to the extent of such payment and (b) in the event any assets of any
Guarantor shall be sold pursuant to any Security Document to satisfy a claim of
any Secured Party, the Borrower shall indemnify such Guarantor in an amount
equal to the greater of the book value or the fair market value of the assets so
sold.

     SECTION 2. Contribution and Subrogation. Each Guarantor (a "Contributing
                ----------------------------
Guarantor") agrees (subject to Section 3) that, in the event a payment shall be
made by any other Guarantor under the Guarantee Agreement or assets of any other
Guarantor shall be sold pursuant to any Security Document to satisfy a claim of
any Secured Party and such other Guarantor (the "Claiming Guarantor") shall not
have been fully indemnified by the Borrower as provided in Section 1, the
Contributing Guarantor shall indemnify the Claiming Guarantor in an amount equal
to the amount of such payment or the greater of the book value or the fair
market value of such assets, as the case may be, in each case multiplied by a
fraction of which the numerator shall be the net worth of the Contributing
Guarantor on the date hereof and the denominator shall be the aggregate net
worth of all the Guarantors on the date hereof (or, in the case of any Guarantor
becoming a party hereto pursuant to Section 12, the date of the Supplement
hereto executed and delivered by such Guarantor). Any Contributing Guarantor
making any payment to a Claiming Guarantor pursuant to this Section 2 shall be
subrogated to the rights of such Claiming Guarantor under Section 1 to the
extent of such payment.

     SECTION 3. Subordination. Notwithstanding any provision of this Agreement
                -------------
to the contrary, all rights of the Guarantors under Sections 1 and 2 and all
other rights of indemnity, contribution or subrogation under applicable law or
otherwise shall be fully subordinated to the indefeasible payment in full in
cash of all Obligations which are then due and payable, whether at maturity, by
acceleration or otherwise, and none of such rights shall be exercised, and no
payments with respect to such rights shall be permitted or shall be paid by any
Contributing Guarantor or received or accepted by or on behalf of any Claiming
Guarantor, at any time when any Obligations which are then due and payable,
whether at maturity, by acceleration or otherwise, remain unpaid. No failure on
the part of the Borrower or any Guarantor to make the payments required by
Sections 1 and 2 (or any other payments required under applicable law or
otherwise) shall in any respect limit the obligations and liabilities of any
Guarantor with respect to its obligations hereunder, and each Guarantor shall
remain liable for the full amount of the obligations of such Guarantor
hereunder.

     SECTION 4. Termination. This Agreement shall survive and be in full force
                -----------
and effect so long as any Obligation is outstanding and has not been
indefeasibly paid in full in cash, and so long as any of the Secured Instrument
Commitments have not been terminated, and shall continue to be effective or be
reinstated, as the case may be, if at any time payment, or any part thereof, of
any Obligation is rescinded or must otherwise be restored by any Secured Party
or any Guarantor upon the insolvency, bankruptcy or reorganization of the
Borrower, any Guarantor or otherwise.

                                       9
<PAGE>

     SECTION 5. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND
                -------------
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 6. No Waiver; Amendment.
                --------------------

          (a)  No failure on the part of the Collateral Agent or any Guarantor
to exercise, and no delay in exercising, any right, power or remedy hereunder
shall operate as a waiver thereof, nor shall any single or partial exercise of
any such right, power or remedy by the Collateral Agent or any Guarantor
preclude any other or further exercise thereof or the exercise of any other
right, power or remedy. All remedies hereunder are cumulative and are not
exclusive of any other remedies provided by law. None of the Collateral Agent
and the Guarantors shall be deemed to have waived any rights hereunder unless
such waiver shall be in writing and signed by such parties.

          (b)  Neither this Agreement nor any provision hereof may be waived,
amended or modified except pursuant to a written agreement entered into between
the Borrower, the Guarantor or Guarantors with respect to which such waiver,
amendment or modification is to apply and the Collateral Agent, subject to any
consents required in accordance with Section 11.02 of the Collateral Agency and
Intercreditor Agreement.

     SECTION 7. Notices. All communications and notices hereunder shall be in
                -------
writing and given as provided in the Guarantee Agreement and addressed as
specified therein.

     SECTION 8. Binding Agreement; Assignments. Whenever in this Agreement any
                ------------------------------
of the parties hereto is referred to, such reference shall be deemed to include
the successors and assigns of such party; and all covenants, promises and
agreements by or on behalf of the parties that are contained in this Agreement
shall bind and inure to the benefit of their respective successors and assigns.
Neither the Borrower nor any Guarantor may assign or transfer any of its rights
or obligations hereunder (and any such attempted assignment or transfer shall be
void), except as expressly contemplated by this Agreement or the other Support
Documents. Notwithstanding the foregoing, at the time any Guarantor is released
from its obligations under the Guarantee Agreement and any Security Documents to
which it is a party in accordance with the Support Documents and the Secured
Instruments, such Guarantor will cease to have any rights or obligations under
this Agreement.

     SECTION 9. Survival of Agreement; Severability.
                -----------------------------------

          (a)  All covenants and agreements made by the Borrower and each
Guarantor herein and in the certificates or other instruments prepared or
delivered in connection with this Agreement or the other Support Documents shall
be considered to have been relied upon by the Collateral Agent, the other
Secured Parties and each Guarantor and shall survive the extension of credit by
any Secured Party pursuant to the Secured Instruments and shall continue in full
force and effect until this Agreement shall terminate.

                                      10
<PAGE>

          (b)  In case any one or more of the provisions contained in this
Agreement should be held invalid, illegal or unenforceable in any respect, no
party hereto shall be required to comply with such provision for so long as such
provision is held to be invalid, illegal or unenforceable, but the validity,
legality and enforceability of the remaining provisions contained herein shall
not in any way be affected or impaired thereby. The parties shall endeavor in
good-faith negotiations to replace the invalid, illegal or unenforceable
provisions with valid provisions the economic effect of which comes as close as
possible to that of the invalid, illegal or unenforceable provisions.

     SECTION 10. Counterparts. This Agreement may be executed in counterparts
                 ------------
(and by different parties hereto on different counterparts), each of which shall
constitute an original, but all of which when taken together shall constitute a
single contract. This Agreement shall be effective with respect to any Guarantor
when a counterpart bearing the signature of such Guarantor shall have been
delivered to the Collateral Agent. Delivery of an executed signature page to
this Agreement by facsimile transmission shall be as effective as delivery of a
manually signed counterpart of this Agreement.

     SECTION 11. Rules of Interpretation. The rules of interpretation specified
                 -----------------------
in Section 1.02 of the Collateral Agency and Intercreditor Agreement shall be
applicable to this Agreement.

     SECTION 12. Additional Guarantors. Upon execution and delivery, after the
                 ---------------------
date hereof, by the Collateral Agent and a Subsidiary Loan Party of an
instrument in the form of Annex 1 hereto, such Subsidiary Loan Party shall
become a Guarantor hereunder with the same force and effect as if originally
named as a Guarantor hereunder. The execution and delivery of any instrument
adding an additional Guarantor as a party to this Agreement shall not require
the consent of any Guarantor hereunder. The rights and obligations of each
Guarantor hereunder shall remain in full force and effect notwithstanding the
addition of any new Guarantor as a party to this Agreement. This Agreement may
be waived, amended or modified with respect to any one or more Guarantors and
any one or more Guarantors may be released from its obligations hereunder
without the consent or agreement of any other Guarantor.

     SECTION 13. Amendment and Restatement.  This Agreement shall constitute an
                 -------------------------
amendment and restatement of that certain Indemnity, Subrogation and
Contribution Agreement dated as of November 24, 1999, by and among the parties
hereto (the "Original Agreement"). From and after the date hereof, all
indebtedness, liabilities, obligations, security interests and liens arising
under the Original Agreement are hereby deemed to be renewed and continued, and
not extinguished, discharged or satisfied, and are hereafter evidenced by and
governed in accordance with this Agreement. All references in the Collateral
Agency and Intercreditor Agreement and elsewhere to the Original Agreement shall
be deemed to mean this Agreement, as an amendment and restatement of the
Original Agreement.

                                      11

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized officers as of the date first appearing above.

                              CRICKET COMMUNICATIONS, INC. (formerly known as
                              Cricket Wireless Communications, Inc.),

                              By   __________________________________
                                   Name:
                                   Title:

                              EACH SUBSIDIARY LISTED ON SCHEDULE I,

                              By   __________________________________
                                   Name:
                                   Title:

                              EACH LICENSE SUBSIDIARY LISTED ON SCHEDULE I,

                              By   __________________________________
                                   Name:
                                   Title:

                              STATE STREET BANK AND TRUST COMPANY, as Collateral
                              Agent,

                              By   __________________________________
                                   Name:
                                   Title:

                                      12
<PAGE>

                                                               Schedule I to the
                                                      Indemnity, Subrogation and
                                                          Contribution Agreement

                                  GUARANTORS

Guarantor                                         Address
---------                                         --------

[To be completed.]

                                      13
<PAGE>

                                                                  Annex 1 to the
                                 Amended and Restated Indemnity, Subrogation and
                                                          Contribution Agreement

               SUPPLEMENT NO. [ ] dated as of [________________], to the Amended
          and Restated Indemnity, Subrogation and Contribution Agreement dated
          as of June ____, 2000 (as the same may be amended, supplemented,
          restated or otherwise modified from time to time, the "Indemnity,
          Subrogation and Contribution Agreement"), among CRICKET
          COMMUNICATIONS, INC. (formerly known as Cricket Wireless
          Communications, Inc.), a Delaware corporation (the "Borrower"),each
          subsidiary of the Borrower listed on Schedule I thereto (each a
          "Subsidiary", and, collectively, the "Subsidiaries"), each subsidiary
          of Leap Wireless International, Inc., a Delaware corporation (the
          "Parent") listed on Schedule I thereto (each a "License Subsidiary",
          and, collectively, the "License Subsidiaries"; each such Subsidiary
          and each such License Subsidiary individually, a "Guarantor" and,
          collectively, the "Guarantors") and STATE STREET BANK AND TRUST
          COMPANY, as collateral agent (in such capacity, the "Collateral
          Agent") for the Secured.

     A.   Reference is made to (a) the Collateral Agency and Intercreditor
Agreement (as defined in the Indemnity, Subrogation and Contribution Agreement)
and (b) the Indemnity, Subrogation and Contribution Agreement.

     B.   Capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in the Indemnity, Subrogation and
Contribution Agreement.

     C.   The Borrower and the Guarantors have entered into the Indemnity,
Subrogation and Contribution Agreement in order to induce the Secured Parties to
make loans under the applicable Secured Instruments. Section 12 of the
Indemnity, Subrogation and Contribution Agreement provides that additional
Subsidiary Loan Parties may become Guarantors under the Indemnity, Subrogation
and Contribution Agreement by execution and delivery of an instrument in the
form of this Supplement. The undersigned Subsidiary Loan Party of the Borrower
(the "New Guarantor") is executing this Supplement in accordance with the
requirements of one or more of the Credit Agreements to become a Guarantor under
the Indemnity, Subrogation and Contribution Agreement in order to induce the
Secured Parties to make additional loans under the applicable Secured
Instruments and as consideration for loans previously made under the Secured
Instruments.

     Accordingly, the Collateral Agent and the New Guarantor agree as follows:

     SECTION 1. In accordance with Section 12 of the Indemnity, Subrogation and
Contribution Agreement, the New Guarantor by its signature below becomes a
Guarantor under the Indemnity, Subrogation and Contribution Agreement with the
same force and effect as if originally named therein as a Guarantor and the New
Guarantor hereby agrees to all the terms and provisions of the Indemnity,
Subrogation and Contribution Agreement applicable to it as a Guarantor
thereunder.  Each reference to a "Guarantor" in the Indemnity, Subrogation and

                                      14
<PAGE>

Contribution Agreement shall be deemed to include the New Guarantor. The
Indemnity, Subrogation and Contribution Agreement is hereby incorporated herein
by reference.

     SECTION 2. The New Guarantor represents and warrants to the Collateral
Agent and the other Secured Parties that this Supplement has been duly
authorized, executed and delivered by it and constitutes its legal, valid and
binding obligation, enforceable against it in accordance with its terms.

     SECTION 3. This Supplement may be executed in counterparts (and by
different parties hereto on different counterparts), each of which shall
constitute an original, but all of which when taken together shall constitute a
single contract. This Supplement shall become effective when the Collateral
Agent shall have received counterparts of this Supplement that, when taken
together, bear the signatures of the New Guarantor and the Collateral Agent.
Delivery of an executed signature page to this Supplement by facsimile
transmission shall be as effective as delivery of a manually signed counterpart
of this Supplement.

     SECTION 4. Except as expressly supplemented hereby, the Indemnity,
Subrogation and Contribution Agreement shall remain in full force and effect.

     SECTION 5. THIS SUPPLEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 6. In case any one or more of the provisions contained in this
Supplement should be held invalid, illegal or unenforceable in any respect,
neither party hereto shall be required to comply with such provision for so long
as such provision is held to be invalid, illegal or unenforceable, but the
validity, legality and enforceability of the remaining provisions contained
herein and in the Indemnity, Subrogation and Contribution Agreement shall not in
any way be affected or impaired. The parties hereto shall endeavor in good-faith
negotiations to replace the invalid, illegal or unenforceable provisions with
valid provisions the economic effect of which comes as close as possible to that
of the invalid, illegal or unenforceable provisions.

     SECTION 7. All communications and notices hereunder shall be in writing and
given as provided in Section 7 of the Indemnity, Subrogation and Contribution
Agreement. All communications and notices hereunder to the New Guarantor shall
be given to it at the address set forth under its signature.

     SECTION 8. The New Guarantor agrees to reimburse the Collateral Agent for
its reasonable out-of-pocket expenses in connection with this Supplement,
including the reasonable fees, other charges and disbursements of counsel for
the Collateral Agent.

                                   Annex 1-2

                                      15
<PAGE>

     IN WITNESS WHEREOF, the New Guarantor and the Collateral Agent have duly
executed this Supplement to the Indemnity, Subrogation and Contribution
Agreement as of the day and year first above written.

                              [NAME OF NEW GUARANTOR],

                              By   __________________________________
                                   Name:
                                   Title:

                              STATE STREET BANK AND TRUST COMPANY, as Collateral
                              Agent,

                              By   __________________________________
                                   Name:
                                   Title:

                                   Annex 1-3

                                      16
<PAGE>

                       Schedule I to Supplement No. [_]
                       to the Indemnity, Subrogation and
                            Contribution Agreement

                                  GUARANTORS

Name                                     Address
----                                     -------

                                      17
<PAGE>

                                   Exhibit D
                                   ---------

                               PARENT AGREEMENT
                               ----------------

     PARENT AGREEMENT dated as of August 28, 2000, among LEAP WIRELESS
INTERNATIONAL, INC., a Delaware corporation (the "Parent") and NORTEL NETWORKS
                                                  ------
INC., as administrative agent (in such capacity, the "Administrative Agent") for
                                                      --------------------
the Lenders (as defined in the Credit Agreement referred to below).

     Reference is made to the Credit Agreement dated as of August 28, 2000 (as
amended, supplemented or otherwise modified from time to time, the "Credit
                                                                    ------
Agreement"), among Cricket Communications, Inc. (the "Borrower"), Cricket
---------                                             --------
Communications Holdings, Inc., the lenders from time to time party thereto (the
"Lenders") and the Administrative Agent.  Capitalized terms used herein and not
 -------
defined herein shall have meanings assigned to such terms in the Credit
Agreement.

     The Lenders have agreed to make Loans to the Borrower pursuant to, and upon
the terms and subject to the conditions specified in, the Credit Agreement. The
Borrower is a subsidiary of the Parent. The obligations of the Lenders to make
Loans are conditioned upon, among other things, the execution and delivery by
the Parent of an agreement in the form hereof to set forth certain covenants,
agreements and obligations of the Parent.

     Accordingly, the Parent and the Administrative Agent, on behalf of itself
and each Lender (and each of their respective successors or assigns), hereby
agree as follows:

     SECTION 1. Covenants. Until the Commitments have expired or terminated and
                ---------
the principal of and interest on each Loan and all fees payable under the Credit
Agreement shall have been paid in full, the Parent hereby covenants and agrees
with the Administrative Agent that:

          (a)  The Parent will not, nor will it permit any of its direct or
indirect subsidiaries (other than the Borrower and the Subsidiary Loan Parties)
to, engage to any material extent in the wireless telecommunications and data
networking business or any business that competes with the business conducted by
the Borrower and the Subsidiary Loan Parties, in each case, in the United
States.

          (b)  The Parent and its subsidiaries (other than the Borrower and the
Subsidiary Loan Parties) will cause all assets owned by the Parent and its
subsidiaries (i) that are used predominantly in the business of the Borrower and
the Subsidiary Loan Parties or (ii) for which the Parent or its subsidiaries
have (A) ordered equipment for deployment or (B) commenced site acquisition, in
each case, for the market in which such assets are to be located, to be owned by
the Borrower and the Subsidiary Loan Parties.

     SECTION 2. Waivers; Amendment.
                ------------------

          (a)  No failure or delay of the Administrative Agent in exercising any
power or right hereunder shall operate as a waiver thereof, nor shall any single
or partial exercise of any

                                      18
<PAGE>

such right or power, or any abandonment or discontinuance of steps to enforce
such a right or power, preclude any other or further exercise thereof or the
exercise of any other right or power. The rights and remedies of the
Administrative Agent hereunder and of the other Secured Parties under the other
Loan Documents are cumulative and are not exclusive of any rights or remedies
that they would otherwise have. No waiver of any provisions of this Agreement or
consent to any departure by the Parent therefrom shall in any event be effective
unless the same shall be permitted by paragraph (b) below, and then such waiver
or consent shall be effective only in the specific instance and for the purpose
for which given. No notice or demand on the Parent in any case shall entitle the
Parent to any other or further notice or demand in similar or other
circumstances.

          (b)  Neither this Agreement nor any provision hereof may be waived,
amended or modified except pursuant to a written agreement entered into between
the Administrative Agent and the Parent, subject to any consent required in
accordance with Section 9.02 of the Credit Agreement.

     SECTION 3. Notices. All communications and notices hereunder shall be in
                -------
writing and given as provided in Section 9.01 of the Credit Agreement; provided
                                                                       --------
that any communication or notice hereunder to the Parent shall be given to it at
10307 Pacific Center Court, San Diego, California 92121, attention of James
Hoffmann, Secretary (Telecopy No. 858-882-6010).

     SECTION 4. Further Assurances. The Parent agrees to do such further acts
                ------------------
and things, and to execute and deliver such additional conveyances, assignments,
agreements and instruments, as the Administrative Agent may at any time
reasonably request in connection with the administration and enforcement of this
Agreement or in order better to assure and confirm unto the Administrative Agent
its rights and remedies hereunder.

     SECTION 5. Binding Effect; Several Agreement; Assignments. Whenever in this
                ----------------------------------------------
Agreement any of the parties hereto is referred to, such reference shall be
deemed to include the successors and assigns of such party; and all covenants,
promises and agreements by or on behalf of the Parent that are contained in this
Agreement shall bind and inure to the benefit of its successors and assigns.
This Agreement shall become effective as to the Parent when a counterpart hereof
executed on behalf of the Parent shall have been delivered to the Administrative
Agent and a counterpart hereof shall have been executed on behalf of the
Administrative Agent, and thereafter shall be binding upon the Parent and the
Administrative Agent and their respective successors and assigns, and shall
inure to the benefit of the Parent, the Administrative Agent and the other
Secured Parties, and their respective successors and assigns.

     SECTION 6. Survival of Agreement; Severability.
                -----------------------------------

          (a)  All covenants, agreements, representations and warranties made by
the Parent herein and in the certificates or other instruments prepared or
delivered in connection with or pursuant to this Agreement or any other Loan
Document shall be considered to have been relied upon by the Administrative
Agent and the other Secured Parties and shall survive the making by the Lenders
of the Loans, regardless of any investigation made by the Secured Parties or on
their behalf, and shall continue in full force and effect as long as the
principal of or any accrued

                                      19
<PAGE>

interest on any Loan or any other fee or amount payable under this Agreement or
any other Loan Document is outstanding and unpaid.

          (b)  In the event any one or more of the provisions contained in this
Agreement should be held invalid, illegal or unenforceable in any respect, the
validity, legality and enforceability of the remaining provisions contained
herein shall not in any way be affected or impaired thereby (it being understood
that the invalidity of a particular provision in a particular jurisdiction shall
not in and of itself affect the validity of such provision in any other
jurisdiction). The parties shall endeavor in good-faith negotiations to replace
the invalid, illegal or unenforceable provisions with valid provisions the
economic effect of which comes as close as possible to that of the invalid,
illegal or unenforceable provisions.

     SECTION 7. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND
                -------------
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 8. Counterparts. This Agreement may be executed in two or more
                ------------
counterparts, each of which shall constitute an original, but all of which, when
taken together, shall constitute a single contract, and shall become effective
as provided in Section 5. Delivery of an executed counterpart of a signature
page to this Agreement by facsimile transmission shall be as effective as
delivery of a manually executed counterpart of this Agreement.

     SECTION 9. Rules of Interpretation. The rules of interpretation specified
                -----------------------
in Section 1.03 of the Credit Agreement shall be applicable to this Agreement.
Section headings used herein are for convenience of reference only, are not part
of this Agreement and are not to affect the construction of, or to be taken into
consideration in interpreting this Agreement.

     SECTION 10. Jurisdiction; Consent to Service of Process.
                 -------------------------------------------

          (a)  The Parent hereby irrevocably and unconditionally submits, for
itself and its property, to the nonexclusive jurisdiction of the Supreme Court
of the State of New York sitting in New York County and of the United States
District Court of the Southern District of New York, and any appellate court
from any thereof, in any action or proceeding arising out of or relating to any
Loan Document, or for recognition or enforcement of any judgment, and each of
the parties hereto hereby irrevocably and unconditionally agrees that all claims
in respect of any such action or proceeding may be heard and determined in such
New York State or, to the extent permitted by law, in such Federal court. Each
of the parties hereto agrees that a final judgment in any such action or
proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on the judgment or in any other manner provided by law. Nothing in this
Agreement or any other Loan Document shall affect any right that the
Administrative Agent or any other Secured Party (as defined in the Collateral
Agency Agreement) may otherwise have to bring any action or proceeding relating
to this Agreement or any other Loan Document against the Parent or its
properties in the courts of any jurisdiction.

          (b)  The Parent hereby irrevocably and unconditionally waives, to the
fullest extent it may legally and effectively do so, any objection that it may
now or hereafter have to the laying of venue of any suit, action or proceeding
arising out of or relating to this Agreement or

                                      20
<PAGE>

the other Loan Documents in any New York State or Federal court. Each of the
parties hereto hereby irrevocably waives, to the fullest extent permitted by
law, the defense of an inconvenient forum to the maintenance of such action or
proceeding in any such court.

          (c)  Each party to this Agreement irrevocably consents to service of
process in the manner provided for notices in Section 3. Nothing in this
Agreement will affect the right of any party to this Agreement to serve process
in any other manner permitted by law.

     SECTION 11. WAIVER OF JURY TRIAL. EACH PARTY HERETO HEREBY WAIVES, TO THE
                 --------------------
FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY
JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER
OR IN CONNECTION WITH THIS AGREEMENT. EACH PARTY HERETO (A) CERTIFIES THAT NO
REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY
OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK
TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER
PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER
THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.

          IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement as of the day and year first above written.

                                         LEAP WIRELESS INTERNATIONAL, INC.

                                    By: _________________________
                                    Name: _______________________
                                    Title: ______________________

                                         NORTEL NETWORKS INC., as
                                         Administrative Agent

                                    By: _________________________
                                    Name: _______________________
                                    Title: ______________________

                                      21
<PAGE>

                                   Exhibit E
                                   ---------

          GUARANTEE AGREEMENT (this "Agreement") dated as of August 28, 2000,
                                     ---------
     from LEAP WIRELESS INTERNATIONAL, INC., a Delaware corporation (the
     "Guarantor") in favor of STATE STREET BANK AND TRUST COMPANY, as collateral
     agent (in such capacity, and including its successors and assigns in such
     capacity, the "Collateral Agent"), for the Secured Parties.

     Reference is made to the Amended and Restated Collateral Agency and
Intercreditor Agreement dated as of August 28, 2000 (as amended, supplemented,
restated or otherwise modified from time to time, the "Collateral Agency and
Intercreditor Agreement") among Cricket Communications, Inc., a Delaware
corporation (the "Borrower"), the Representatives and Unrepresented Holders
referred to therein and the Collateral Agent. Capitalized terms used herein and
not defined herein shall have the meanings assigned to such terms in the
Collateral Agency and Intercreditor Agreement. The Guarantor acknowledges
receipt of a true and correct copy of the Collateral Agency and Intercreditor
Agreement.

     The lenders (the "Nortel Lenders") under the Credit Agreement dated as of
August 28, 2000, among the Borrower, Holdings, the Nortel Lenders and Nortel
Networks Inc., as administrative agent (the "Nortel Credit Agreement") have
agreed to make loans to the Borrower pursuant to, and upon the terms and subject
to the conditions specified in, the Nortel Credit Agreement. The Guarantor is
the indirect owner of 100% of the capital stock of the Borrower and acknowledges
that it will derive substantial benefit from the making of loans to the Borrower
under the Nortel Credit Agreement. The obligations of the Nortel Lenders to make
loans to the Borrower are conditioned on, among other things, the execution and
delivery by the Guarantor of a Guarantee Agreement in the form hereof. In
addition, Section 9.04 of the Collateral Agency and Intercreditor Agreement
provides, in part, that no Secured Party (including the Nortel Lenders) may
accept any Guarantee of any of the Obligations unless such Guarantee guarantees
the payment of all of the Obligations on a pari passu basis. In order to induce
the Nortel Lenders to make loans under the Nortel Credit Agreement, the
Guarantor is willing to execute this Agreement.

     Accordingly, the Guarantor and the Collateral Agent, on behalf of itself
and each Secured Party (and each of their respective successors or assigns),
hereby agree as follows:

     SECTION 1. Guarantee. (a) As used herein, a "Guaranty Event" shall occur
                ---------
at any time that the following three conditions shall have occurred or shall
have been satisfied:

               (i)  The Borrower, Holdings or any Subsidiary Loan Party shall:

                    (A) pay dividends or make any other distributions on or with
               respect to any Equity Interests of the Borrower, Holdings or such
               Subsidiary Loan Party owned by the Guarantor or any of the
               Guarantor's subsidiaries;

                    (B) pay any Indebtedness owed to the Guarantor or any of the
               Guarantor's subsidiaries;

                                      22
<PAGE>

                     (C) make loans or advances to the Guarantor or any of the
               Guarantor's subsidiaries; or

                     (D) transfer any of its property or assets to the Guarantor
               or any of the Guarantor's subsidiaries,

          AND

               (ii)  the action described in clause (i) above is prohibited by
          the terms of the Lucent Credit Agreement as it exists on the date of
          this Agreement without giving effect to any amendment, waiver or other
          change thereto occurring after the date hereof to which the Required
          Committed Credit Facility Parties under each Credit Facility have not
          consented;

          AND

               (iii) the action described in (i) above is not prohibited by
          Article VI of the Nortel Credit Agreement giving effect to the
          provisions of Section 9.15 of the Nortel Credit Agreement.

          As used herein, the "Lucent Credit Agreement" means the Credit
          Agreement dated as of September 20, 1999, among Holdings, the
          Borrower, the lenders parties thereto and Lucent Technologies Inc., as
          administrative agent for such lenders, as such Credit Agreement has
          been amended by the First Amendment dated as of November 24, 1999, the
          Second Amendment dated as of January 27, 2000, the Third Amendment
          dated as of June 30, 2000, and the Fourth Amendment dated as of August
          14, 2000.

          (b)  Effective upon the occurrence of a Guaranty Event, the Guarantor
          unconditionally guarantees, jointly with any other guarantors and
          severally, as a primary obligor and not merely as a surety, the due
          and punctual payment of the Obligations, when and as due, whether at
          maturity, by acceleration, upon one or more dates set for prepayment
          or otherwise; provided, however, that if the Guaranty Event is of the
          type described in subclauses (B) through (D) of clause (i) above (a
          "Non-Distribution Guaranty Event"), the amount guaranteed by the
          Guarantor pursuant to this Agreement shall be limited to the amount of
          the Indebtedness paid, loans or advances made, or property or assets
          transferred, as the case may be, that constitute such Guaranty Event;
          provided further, however, if, and only if, the Guarantor does not
          cure such Non-Distribution Guaranty Event, or cause such Non-
          Distribution Guaranty Event to be cured, within 30 days after the
          earlier of:

               (i) the date on which the Borrower gives notice under the Lucent
          Credit Agreement that a Default has occurred as a result of the
          occurrence of a Non-Distribution Guaranty Event; and

                                      23
<PAGE>

               (ii) the date on which the Collateral Agent or any Holder
          notifies the Guarantor that a Non-Distribution Guaranty Event has
          occurred;

then the amount Guaranteed by the Guarantor pursuant to this Agreement shall not
be limited in amount as provided in the immediately preceding proviso but shall
be the full amount of the Obligations.

          (c)  A Non-Distribution Guaranty Event may be cured by:

                    (i)   the return of the payment of Indebtedness, the
          repayment of the loan or advance, or the return of the transferred
          property or assets, as applicable;

                    (ii)  the payment to the paying, advancing or transferring
          Loan Party of an amount equal to the Indebtedness paid, loans or
          advances made, or value of the property or assets transferred; or

                    (iii) the pledge of cash or cash equivalents in the amount
          described in clause (ii) above to the Collateral Agent as Collateral
          to secure the Obligations pursuant to an Additional Security Document
          reasonably satisfactory in form and substance to the Required
          Committed Credit Facility Parties under each Credit Facility.

          (d)  The Guarantor agrees that the Obligations may be extended or
          renewed, in whole or in part, without notice to or further assent from
          it, and that it will remain bound upon its guarantee notwithstanding
          any extension or renewal of any Obligation.

     SECTION 2. Obligations Not Waived. To the fullest extent permitted by
                ----------------------
applicable law, the Guarantor waives presentment to, demand of payment from and
protest to the Borrower of any of the Obligations, and also waives notice of
acceptance of its guarantee and notice of protest for nonpayment. To the fullest
extent permitted by applicable law, the obligations of the Guarantor hereunder
shall not be affected by (a) the failure of the Collateral Agent or any other
Secured Party to assert any claim or demand or to enforce or exercise any right
or remedy against the Borrower or any other guarantor under the provisions of
any Support Document or Secured Instrument or otherwise, (b) any rescission,
waiver, amendment or modification of, or any release from any of the terms or
provisions of, this Agreement, any other Support Document, any Secured
Instrument, any Guarantee or any other agreement, including with respect to any
other guarantor or (c) the failure to perfect any security interest in, or the
release of, any of the security held by or on behalf of the Collateral Agent or
any other Secured Party.

     SECTION 3. Security. The Guarantor authorizes the Collateral Agent and
                --------
each of the other Secured Parties, to (a) take and hold security for the payment
of the Obligations and exchange, enforce, waive and release any such security,
(b) apply such security and direct the order or manner of sale thereof as they
in their sole discretion may determine and (c) release or substitute any one or
more endorsers or other guarantors or other obligors.

                                      24
<PAGE>

     SECTION 4. Guarantee of Payment. The Guarantor further agrees that its
                --------------------
guarantee hereunder constitutes a guarantee of payment when due and not of
collection, and waives any right to require that any resort be had by the
Collateral Agent or any other Secured Party to any of the security held for
payment of the Obligations or to any balance of any deposit account or credit on
the books of the Collateral Agent or any other Secured Party in favor of the
Borrower or any other Person.

     SECTION 5. No Discharge or Diminishment of Guarantee. The obligations of
                -----------------------------------------
the Guarantor hereunder shall not be subject to any reduction, limitation,
impairment or termination for any reason (other than the indefeasible payment in
full of all the Obligations), including any claim of waiver, release, surrender,
alteration or compromise of any of the Obligations, and shall not be subject to
any defense or setoff, counterclaim, recoupment or termination whatsoever by
reason of the invalidity, illegality or unenforceability of the Obligations or
otherwise. Without limiting the generality of the foregoing, the obligations of
the Guarantor hereunder shall not be discharged or impaired or otherwise
affected by the failure of the Collateral Agent or any other Secured Party to
assert any claim or demand or to enforce any right or remedy under any Support
Document, any Secured Instrument or any other agreement, by any waiver or
modification of any provision of any thereof, by any default, failure or delay,
wilful or otherwise, in the performance of the Obligations, or the failure to
perfect any security interest in, or the release of, any of the security held by
or on behalf of the Collateral Agent or any other Secured Party, or by any other
act or omission that may or might in any manner or to any extent vary the risk
of the Guarantor or that would otherwise operate as a discharge of the Guarantor
as a matter of law or equity (other than the indefeasible payment in full of all
the Obligations).

     SECTION 6. Defenses of Borrower Waived.  To the fullest extent permitted
                ---------------------------
by applicable law, the Guarantor waives any defense based on or arising out of
any defense of the Borrower or the unenforceability of the Obligations or any
part thereof from any cause, or the cessation from any cause of the liability of
the Borrower, other than the final and indefeasible payment in full of all the
Obligations.  Subject to the terms of the Collateral Agency and Intercreditor
Agreement, the Collateral Agent and the other Secured Parties may, at their
election, foreclose on any security held by one or more of them by one or more
judicial or nonjudicial sales, accept an assignment of any such security in lieu
of foreclosure, compromise or adjust any part of the Obligations, make any other
accommodation with the Borrower or any other guarantor or exercise any other
right or remedy available to them against the Borrower or any other guarantor,
without affecting or impairing in any way the liability of the Guarantor
hereunder except to the extent the Obligations have been fully, finally and
indefeasibly paid. To the fullest extent permitted by applicable law, the
Guarantor waives any defense arising out of any such election even though such
election operates, pursuant to applicable law, to impair or to extinguish any
right of reimbursement or subrogation or other right or remedy of the Guarantor
against the Borrower or any other guarantor, as the case may be, or any
security.

     SECTION 7. Agreement to Pay; Subordination.  In furtherance of the
                -------------------------------
foregoing and not in limitation of any other right or remedy that the Collateral
Agent or any other Secured Party has at law or in equity against the Guarantor
by virtue hereof, upon the failure of the Borrower or any other Loan Party to
pay any Obligation when and as the same shall become due after the occurrence of
a Guaranty Event (and subject to the proviso to Section 1 hereof limiting the

                                      25
<PAGE>

Guarantors obligation in certain circumstances), whether at maturity, by
acceleration, after notice of prepayment or otherwise, the Guarantor hereby
promises to and will forthwith pay, or cause to be paid, to the Collateral Agent
the amount of such unpaid Obligations to be applied by the Collateral Agent in
the manner required by Article V of the Collateral Agency and Intercreditor
Agreement. Upon payment by the Guarantor of any sums to the Collateral Agent,
all rights of the Guarantor against the Borrower arising as a result thereof by
way of right of subrogation, contribution, reimbursement, indemnity or otherwise
shall in all respects be subordinate and junior in right of payment to the prior
indefeasible payment in full of all the Obligations as provided in the
Subordination Agreement.

     SECTION 8.  Information. The Guarantor assumes all responsibility for being
                 -----------
and keeping itself informed of the Borrower's and each other Loan Party's
financial condition and assets, and of all other circumstances bearing upon the
risk of nonpayment of the Obligations and the nature, scope and extent of the
risks that such Guarantor assumes and incurs hereunder, and agrees that none of
the Collateral Agent or the other Secured Parties will have any duty to advise
the Guarantor of information known to it or any of them regarding such
circumstances or risks.

     SECTION 9.  Representations and Warranties.  The Guarantor represents and
                 ------------------------------
warrants as to itself that all representations and warranties relating to it
contained in the Lucent Credit Agreement and the Nortel Credit Agreement are
true and correct.

     SECTION 10. Termination.  The Guarantee made hereunder (a) shall terminate
                 -----------
when all the Obligations have been indefeasibly paid in full and all Secured
Instrument Commitments shall have been terminated and (b) shall continue to be
effective or be reinstated, as the case may be, if at any time payment, or any
part thereof, of any Obligation is rescinded or must otherwise be restored by
any Secured Party or any guarantor upon the insolvency, bankruptcy or
reorganization of the Borrower, any guarantor or otherwise.  Subject to
reinstatement if and to the extent necessary to provide for payment pursuant to
the terms hereof of an amount previously paid that has been rescinded or
otherwise restored as provided in clause (b) of the preceding sentence, the
Guarantee made hereunder shall also terminate if and when all of the
restrictions contained in Section 4.16 of the Indenture dated as of February 23,
2000, among the Guarantor, as issuer, Holdings, as guarantor, and State Street
Bank and Trust Company, as trustee, shall have been eliminated or terminated,
provided that at such time no Guaranty Event shall then exist.

     SECTION 11. Binding Effect; Assignments.  Whenever in this Agreement any
                 ---------------------------
of the parties hereto is referred to, such reference shall be deemed to include
the successors and assigns of such party; and all covenants, promises and
agreements by or on behalf of the Guarantor that are contained in this Agreement
shall bind and inure to the benefit of each party hereto and their respective
successors and assigns. This Agreement shall become effective as to the
Guarantor when a counterpart hereof executed on behalf of the Guarantor shall
have been delivered to the Collateral Agent, and a counterpart hereof shall have
been executed on behalf of the Collateral Agent, and thereafter shall be binding
upon the Guarantor and the Collateral Agent and their respective successors and
assigns, and shall inure to the benefit of the Guarantor, the Collateral Agent
and the other Secured Parties, and their respective successors and assigns,
except that the

                                      26
<PAGE>

Guarantor shall not have the right to assign its rights or obligations hereunder
or any interest herein (and any such attempted assignment shall be void).

     SECTION 12. Waivers; Amendment. (a) No failure or delay of the Collateral
                 ------------------
Agent in exercising any power or right hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise of any such right or power, or
any abandonment or discontinuance of steps to enforce such a right or power,
preclude any other or further exercise thereof or the exercise of any other
right or power.  The rights and remedies of the Collateral Agent hereunder and
of the Collateral Agent and the other Secured Parties under the other Support
Documents are cumulative and are not exclusive of any rights or remedies that
they would otherwise have.  No waiver of any provision of this Agreement or
consent to any departure by the Guarantor therefrom shall in any event be
effective unless the same shall be permitted by paragraph (b) below, and then
such waiver or consent shall be effective only in the specific instance and for
the purpose for which given.  No notice or demand on the Guarantor in any case
shall entitle the Guarantor to any other or further notice or demand in similar
or other circumstances.

     (b)  Neither this Agreement nor any provision hereof may be waived, amended
or modified except pursuant to a written agreement entered into between the
Guarantor and the Collateral Agent, subject to any consents required in
accordance with Section 11.02 of the Collateral Agency and Intercreditor
Agreement.

     SECTION 13. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND
                 -------------
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 14. Notices. All communications and notices hereunder shall be in
                 -------
writing and given as provided in Section 11.01 of the Collateral Agency and
Intercreditor Agreement; provided, however, that all such communications and
notices to the Guarantor shall be delivered to:

     Leap Wireless International, Inc.
     10307 Pacific Center Court
     San Diego, California 92121

     Attention: President
     Telecopy No. (619) 882-6010

With a copy to:

     Attention: General Counsel
     Telecopy No. (619) 882-6010

     SECTION 15. Survival of Agreement; Severability. (a) All covenants,
                 -----------------------------------
agreements, representations and warranties made by the Guarantor herein and in
the certificates or other instruments prepared or delivered in connection with
or pursuant to this Agreement or any other Support Document shall be considered
to have been relied upon by the Collateral Agent and the other Secured Parties
and shall survive the extension of credit by any Secured Party pursuant to a

                                      27
<PAGE>

Secured Instrument regardless of any investigation made by any Secured Party or
on its behalf, and shall continue in full force and effect until this Agreement
shall terminate.

     (b)  In the event any one or more of the provisions contained in this
Agreement or in any other Support Document should be held invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained herein and therein shall not in any way be
affected or impaired thereby (it being understood that the invalidity of a
particular provision in a particular jurisdiction shall not in and of itself
affect the validity of such provision in any other jurisdiction). The parties
shall endeavor in good-faith negotiations to replace the invalid, illegal or
unenforceable provisions with valid provisions the economic effect of which
comes as close as possible to that of the invalid, illegal or unenforceable
provisions.

     SECTION 16. Counterparts. This Agreement may be executed in counterparts,
                 ------------
each of which shall constitute an original, but all of which when taken together
shall constitute a single contract, and shall become effective as provided in
Section 11. Delivery of an executed signature page to this Agreement by
facsimile transmission shall be as effective as delivery of a manually executed
counterpart of this Agreement.

     SECTION 17. Rules of Interpretation. The rules of interpretation
                 -----------------------
specified in Section 1.02 of the Collateral Agency and Intercreditor Agreement
shall be applicable to this Agreement.

     SECTION 18. Jurisdiction; Consent to Service of Process. (a) The
                 -------------------------------------------
Guarantor hereby irrevocably and unconditionally submits, for itself and its
property, to the nonexclusive jurisdiction of the Supreme Court of the State of
New York sitting in New York County and of the United States District Court of
the Southern District of New York, and any appellate court from any thereof, in
any action or proceeding arising out of or relating to this Agreement or any
other Support Document, or for recognition or enforcement of any judgment, and
each of the parties hereto hereby irrevocably and unconditionally agrees that
all claims in respect of any such action or proceeding may be heard and
determined in such New York State or, to the extent permitted by law, in such
Federal court. Each of the parties hereto agrees that a final judgment in any
such action or proceeding shall be conclusive and may be enforced in other
jurisdictions by suit on the judgment or in any other manner provided by law.
Nothing in this Agreement or any other Support Document shall affect any right
that the Collateral Agent or any other Secured Party may otherwise have to bring
any action or proceeding relating to this Agreement or any other Support
Document against the Guarantor or its properties in the courts of any
jurisdiction.

          (b)  The Guarantor hereby irrevocably and unconditionally waives, to
the fullest extent it may legally and effectively do so, any objection that it
may now or hereafter have to the laying of venue of any suit, action or
proceeding arising out of or relating to this Agreement or any other Support
Document in any New York State or Federal court. Each of the parties hereto
hereby irrevocably waives, to the fullest extent permitted by law, the defense
of an inconvenient forum to the maintenance of such action or proceeding in any
such court.

          (c)  Each party to this Agreement irrevocably consents to service of
process in the manner provided for notices in Section 14.  Nothing in this
Agreement will affect the right of any party to this Agreement to serve process
in any other manner permitted by law.

                                      28
<PAGE>

     SECTION 19.  WAIVER OF JURY TRIAL.  EACH PARTY HERETO HEREBY WAIVES, TO THE
                  --------------------
FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY
JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER
OR IN CONNECTION WITH THIS AGREEMENT OR THE OTHER SUPPORT DOCUMENTS. EACH PARTY
HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER
PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT,
IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B)
ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER
INTO THIS AGREEMENT AND THE OTHER SUPPORT DOCUMENTS, AS APPLICABLE, BY, AMONG
OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 19.

     SECTION 20. Right of Setoff.  While a Notice of Enforcement is in effect,
                 ---------------
each Secured Party is hereby authorized at any time and from time to time, to
the fullest extent permitted by law, to set off and apply any and all deposits
(general or special, time or demand, provisional or final) at any time held and
other Indebtedness at any time owing by such Secured Party to or for the credit
or the account of the Guarantor against any or all the obligations of the
Guarantor then due under this Agreement, irrespective of whether or not such
Secured Party shall have made any demand under this Agreement or any other
Support Document. After any exercise of such right of setoff, the Secured Party
shall give notice of such exercise to the Collateral Agent and the Guarantor;
provided, however, that failure to give such notice shall not in any way affect
the rights of any Secured Party. The rights of each Secured Party under this
Section 20 are in addition to other rights and remedies (including other rights
of setoff) which such Secured Party may have.

     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement as
of the day and year first above written.

                                   LEAP WIRELESS INTERNATIONAL, INC.

                                   By _______________________
                                   Name: ____________________
                                   Title: ___________________

                                   STATE STREET BANK AND TRUST COMPANY, as
                                   Collateral Agent

                                   By _______________________
                                   Name: ____________________
                                   Title: ___________________

                                      29
<PAGE>

                                   Exhibit F
                                   ---------

                            PERFECTION CERTIFICATE
                            ----------------------

     Reference is made to (a) the Amended and Restated Collateral Agency and
Intercreditor Agreement dated as of August 28, 2000 (as amended, supplemented or
otherwise modified from time to time, the "Collateral Agency and Intercreditor
                                           -----------------------------------
Agreement"), among Cricket Communications, Inc. (the "Borrower"), Lucent
---------                                             --------
Technologies Inc., Nortel Networks Inc., Societe General, the other
Representatives and Unrepresented Holders referred to therein and State Street
Bank and Trust Company, as collateral agent (in such capacity, the "Collateral
                                                                    ----------
Agent") and (b) the Security Agreement dated as of November 24, 1999 (as
-----
amended, supplemented or otherwise modified from time to time, the "Security
                                                                    --------
Agreement"), among the Grantors (as defined therein) and the Collateral Agent.
---------
Capitalized terms used herein and not defined herein shall have meanings
assigned to such terms in the Collateral Agency and Intercreditor Agreement and
the Security Agreement.

     The undersigned, a Financial Officer and the chief legal officer,
respectively, of the Borrower, hereby certify to the Collateral Agent and each
other Secured Party as follows:

     1.   Names.
          -----

     (a)  The exact corporate name of each Grantor, as such name appears in its
respective certificate or articles of incorporation, is as follows:

          __________________________________________________________________

     (b)  Set forth below is each other corporate name each Grantor has had in
the past five years, together with the date of the relevant change:

          __________________________________________________________________

     (c)  Except as set forth in Schedule 1 hereto, no Grantor has changed its
                                 ----------
identity or corporate structure in any way within the past five years.  Changes
in identity or corporate structure would include mergers, consolidations and
acquisitions, as well as any change in the form, nature or jurisdiction of
corporate organization.  If any such change has occurred, include in Schedule 1
                                                                     ----------
the information required by Sections 1 and 2 of this Certificate as to each
                            ----------     -
acquiree or constituent party to a merger or consolidation.

     (d)  The following is a list of all other names (including trade names or
similar appellations) used by each Grantor or any of its divisions or other
business units in connection with the conduct of its business or the ownership
of its properties at any time during the past five years:

     (e)  Set forth below is the Federal Taxpayer Identification Number of each
Grantor:

                                      30
<PAGE>

     2.   Current Locations.
          -----------------

     (a)  The chief executive office of each Grantor is located at the address
set forth opposite its name below:

Grantor        Mailing Address          County         State
-------        ---------------          ------         -----

     (b)  Set forth below opposite the name of each Grantor are all locations
where such Grantor maintains any books or records relating to any Accounts
Receivable (with each location at which chattel paper, if any, is kept being
indicated by an "*"):

Grantor        Mailing Address          County         State
-------        ---------------          ------         -----

     (c)  Set forth below opposite the name of each Grantor are all the places
of business of such Grantor not identified in paragraph (a) or (b) above:

Grantor        Mailing Address          County         State
-------        ---------------          ------         -----

     (d)  Set forth below opposite the name of each Grantor are all the
locations where such Grantor maintains any Collateral not identified above:

Grantor        Mailing Address          County         State
-------        ---------------          ------         -----

     (e)  Set forth below opposite the name of each Grantor are the names and
addresses of all Persons other than such Grantor that have possession of any of
the Collateral of such Grantor:

Grantor        Mailing Address          County         State
-------        ---------------          ------         -----

     3.   Unusual Transactions.  All Accounts Receivable have been originated by
          --------------------
the Grantors and all Inventory has been acquired by the Grantors in the ordinary
course of business.

     4.   File Search Reports.  Attached hereto as Schedule 4(A) are true copies
          -------------------                      -------------
of file search reports from the Uniform Commercial Code filing offices where
filings described in Schedule 6 are to be made. Attached hereto as Schedule 4(B)
                     ----------                                    -------------
is a true copy of each financing statement or other filing identified in such
file search reports.

     5.   UCC Filings.  Duly signed financing statements on Form UCC-1 in
          -----------
substantially the form of Schedule 5 hereto have been prepared for filing in the
                          ----------
Uniform Commercial Code filing office in each jurisdiction where a Grantor has
Collateral as identified in Section 2 hereof.
                            ---------

                                      31
<PAGE>

     6.   Schedule of Filings.  Attached hereto as Schedule 6 is a schedule
          -------------------                      ----------
setting forth, with respect to the filings described in Section 5 above, each
                                                        ---------
filing and the filing office in which such filing is to be made.

     7.   Stock Ownership.  Attached hereto as Schedule 7 is a true and correct
          ---------------                      ----------
list of all the duly authorized, issued and outstanding Equity Interests of the
Borrower and each Subsidiary Loan Party and the record and beneficial owners of
such stock.  Also set forth on Schedule 7 is each equity investment of the
                               ----------
Borrower and each Subsidiary Loan Party that represents 50% or less of the
equity of the entity in which such investment was made.

     8.   Notes. Attached hereto as Schedule 8 is a true and correct list of all
          -----                     ----------
notes held by the Borrower and each Subsidiary Loan Party and all intercompany
notes between the Borrower and each Subsidiary Loan Party and between each
Subsidiary Loan Party and each other Subsidiary Loan Party.

     9.   Advances. Attached hereto as Schedule 9 is (a) a true and correct list
          --------                     ----------
of all advances made by the Borrower to any Subsidiary Loan Party or made by any
Subsidiary Loan Party to the Borrower or any other Subsidiary Loan Party, which
advances will be on and after the date hereof evidenced by one or more
intercompany notes pledged to the Collateral Agent under the Pledge Agreements
(as such term is defined in the Nortel Credit Agreement), and (b) a true and
correct list of all unpaid intercompany transfers of goods sold and delivered by
or to the Borrower or any Subsidiary Loan Party.

     10.  Mortgage Filings.  Attached hereto as Schedule 10 is a schedule
          ----------------                      -----------
setting forth, with respect to each Mortgaged Property (as such term is defined
in the Nortel Credit Agreement), (i) the exact corporate name of the entity that
owns such property as such name appears in its certificate of formation, (ii) if
different from the name identified pursuant to clause (i), the exact name of the
current record owner of such property reflected in the records of the filing
office for such property identified pursuant to the following clause and (iii)
the filing office in which a Mortgage (as such term is defined in the Nortel
Credit Agreement) with respect to such property must be filed or recorded in
order for the Collateral Agent to obtain a perfected lien or security interest
therein.

     IN WITNESS WHEREOF, the undersigned have duly executed this certificate on
this ______ day of _________, _______.

                              CRICKET COMMUNICATIONS, INC.

                              By: ______________________________________
                              Name: ____________________________________
                              Title: ___________________________________

                                      32
<PAGE>

                                   Exhibit G
                                   ---------

               FIRST AMENDMENT dated as of August 28, 2000, to the Subordination
          Agreement dated as of November 24, 1999 (as supplemented and otherwise
          amended, the "Subordination Agreement"), among CRICKET COMMUNICATIONS
          HOLDINGS, INC. ("Holdings"), CRICKET COMMUNICATIONS, INC. (the
          "Borrower"), LEAP WIRELESS INTERNATIONAL, INC. (the "Parent"), the
          Subsidiaries and License Subsidiaries party thereto (each Subsidiary,
          each License Subsidiary, Holdings and the Parent individually, a
          "Subordinated Creditor" and, collectively, the "Subordinated
          Creditors"), and STATE STREET BANK AND TRUST COMPANY, as Collateral
          Agent.  Capitalized terms used herein and not defined herein shall
          have the meanings assigned to such terms in the Subordination
          Agreement.

     WHEREAS the Borrower and the Subordinated Creditors have requested that
certain provisions of the Subordination Agreement be amended in certain
respects, and the Collateral Agent is willing to amend such provisions on the
terms and subject to the conditions set forth herein.

     NOW, THEREFORE, for and in consideration of the mutual agreements contained
in this Amendment and other good and valuable consideration, the sufficiency and
receipt of which are hereby acknowledged, the parties hereto hereby agree as
follows:

     SECTION 1.  Amendments.  (a) Clause (b) of Section 2.4 of the Subordination
                 -----------
Agreement is hereby amended and restated to read in its entirety as follows:

     "(b) an event has occurred or would occur that with notice, lapse of time
     or both would entitle the Required Secured Parties to deliver a Notice of
     Enforcement."

     (b)  The last sentence of Section 5.2 of the Subordination Agreement is
hereby amended and restated to read in its entirety as follows:

     "Each Subordinated Creditor agrees that it shall not assign or delegate any
     of its obligations under this Agreement without the prior written consent
     of the Collateral Agent and the Required Committed Secured Parties, and any
     attempted assignment or delegation without such consent shall be void and
     of no effect."

     (c) The phrase "Upon execution and delivery by the Agent and an Affiliate
of Holdings or the Borrower or a Subsidiary Loan Party of an instrument in the
form of Annex 1 attached thereto" in the first sentence of Section 5.9 is hereby
amended to read in its entirety "Upon execution and delivery by the Collateral
Agent and an Affiliate of Holdings or the Borrower or a Subsidiary Loan Party of
an instrument in the form of Annex 1 attached thereto".

                                      33
<PAGE>

     SECTION 2. Representations and Warranties. The Borrower and each of the
                -------------------------------
Subordinated Creditors hereby jointly and severally represent and warrant to the
Collateral Agent that this Amendment has been duly authorized, executed and
delivered by the Borrower and each of the Subordinated Creditors and each of
this Amendment and the Subordination Agreement as amended hereby constitutes a
legal, valid and binding obligation of the Borrower and each of the Subordinated
Creditors, enforceable in accordance with its terms.

     SECTION 3. Applicable Law. THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE
                --------------
WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

     SECTION 4. Subordination Agreement. Except as expressly amended hereby,
                ------------------------
the Subordination Agreement shall continue in full force and effect in
accordance with the provisions thereof.  Any reference in the Subordination
Agreement, or in any documents or instruments required thereunder or annexes or
schedules thereto, referring to the Subordination Agreement shall be deemed to
refer to the Subordination Agreement as amended by this Amendment.

     SECTION 5. Expenses. The Borrower agrees to reimburse the Collateral
                ---------
Agent for its out-of-pocket expenses in connection with this Amendment.

     SECTION 6. Counterparts. This Amendment may be executed in two or more
                -------------
counterparts, each of which shall constitute an original but all of which when
taken together shall constitute but one contract. Delivery of an executed
counterpart of a signature page by facsimile transmission shall be effective as
delivery of a manually executed counterpart of this Amendment.

                                      34
<PAGE>

    IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly
executed by their respective authorized officers as of the day and year first
written above.

                         BORROWER:
                         --------
                         CRICKET COMMUNICATIONS, INC.

                         By: ________________________________
                         Name: ______________________________
                         Title: _____________________________

                         SUBORDINATED CREDITORS:
                         ----------------------
                         CRICKET COMMUNICATIONS HOLDINGS, INC.

                         By: ________________________________
                         Name: ______________________________
                         Title: _____________________________

                         CHASE TELECOMMUNICATIONS, INC.
                         CHASETEL LICENSEE CORP.
                         CHASETEL REAL ESTATE HOLDING COMPANY, INC.
                         CRICKET ARIZONA PROPERTY COMPANY
                         CRICKET ARKANSAS PROPERTY COMPANY
                         CRICKET COLORADO PROPERTY COMPANY
                         CRICKET GEORGIA PROPERTY COMPANY
                         CRICKET HOLDINGS DAYTON, INC.
                         CRICKET KANSAS PROPERTY COMPANY
                         CRICKET LICENSEE (NORTH CAROLINA), INC.,
                            formerly known as Cricket Holdings, Inc.
                         CRICKET LICENSEE (REAUCTION), INC.
                         CRICKET NEW MEXICO PROPERTY COMPANY
                         CRICKET NORTH CAROLINA PROPERTY COMPANY
                         CRICKET OKLAHOMA PROPERTY COMPANY
                         CRICKET PENNSYLVANIA PROPERTY COMPANY
                         CRICKET UTAH PROPERTY COMPANY
                         CRICKET WASHINGTON PROPERTY COMPANY

                         By: ________________________________
                         Name: ______________________________
                         Title: _____________________________

                                      35
<PAGE>

                         LEAP WIRELESS INTERNATIONAL, INC.

                         By: _______________________________
                         Name: _____________________________
                         Title: ____________________________

                         COLLATERAL AGENT:
                         ----------------
                         STATE STREET BANK AND TRUST COMPANY, as
                         Collateral Agent

                         By: _______________________________
                         Name: _____________________________
                         Title: ____________________________

                                      36
<PAGE>

                                 SCHEDULE 2.01
                                 -------------

                                  COMMITMENTS

              Lender                                    Commitment
              ------                                   ------------
              Nortel Networks Inc.                     $525,000,000

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