Document:

<PAGE>   1
                                                                    EXHIBIT 10.1

                                    CDMA 1900

                                    SPRINTCOM

                         ADDITIONAL AFFILIATE AGREEMENT

                                     BETWEEN

                                 ALAMOSA PCS LLC

                                       AND

                              NORTHERN TELECOM INC.

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                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
        ARTICLE                                                   PAGE
        -------                                                   ----
<S>                                                               <C>
1.      DEFINITIONS                                                 1
2.      SCOPE                                                       7
3.      PURCHASE ORDERS                                             8
4.      PRICE                                                       9
5.      SELLER FINANCING                                           10
6.      PAYMENT                                                    11
7.      DELIVERY, RISK OF LOSS, TITLE                              13
8.      WARRANTIES, REMEDIES AND LIMITATION OF WARRANTIES AND
        REMEDIES AND DISCLAIMERS OF WARRANTIES AND LIABILITY       14
9.      FORCE MAJEURE                                              18
10.     PATENT OR COPYRIGHT INFRINGEMENTS                          18
11.     SOFTWARE LICENSE                                           19
12.     SOFTWARE CHANGES                                           19
13.     REMEDIES                                                   20
14.     ACCEPTANCE TESTING                                         21
15.     COVERAGE, INTERFERENCE AND THIRD-PARTY FACILITIES          23
16.     REGULATORY COMPLIANCE                                      23
17.     CHANGES                                                    24
18.     CONDITION OF INSTALLATION SITE(S)                          26
19.     RELEASE OF INFORMATION                                     26
20.     CONFIDENTIALITY                                            27
21.     INTERCONNECTION                                            27
22.     ANNEXES                                                    28
23.     GENERAL                                                    29
</TABLE>

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                            TABLE OF CONTENTS (CONT)

<TABLE>
<S>             <C>
ANNEXES
ANNEX 1    -    EQUIPMENT/PRICING
ANNEX 2    -    SERVICES
ANNEX 3    -    TURNOVER AND ACCEPTANCE NOTICES
ANNEX 4    -    SELLER WARRANTY SERVICES
ANNEX 5    -    SOFTWARE LICENSE
ANNEX 6    -    DOCUMENTATION
ANNEX 7    -    ADJUNCT PLATFORMS
</TABLE>

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                                    CDMA 1900
                                    SPRINTCOM
                         ADDITIONAL AFFILIATE AGREEMENT

AGREEMENT dated December 21, 1998, by and between Alamosa PCS LLC (hereinafter
referred to as "Buyer") a Texas corporation with offices located at 4727 South
Loop 289, Lubbock, Texas 79424 and Northern Telecom Inc., a Delaware corporation
with offices located at 2435 N. Central Expressway, Richardson, Texas 75080
(hereinafter referred to as "Nortel" or "Seller").

                                   WITNESSETH:

WHEREAS, SprintCom has designated Buyer an Additional Affiliate and Seller has
approved such designation in accordance with the Nortel/SprintCom contract dated
October 1, 1997 ("SprintCom Contract"); and

WHEREAS, Buyer desires to purchase certain equipment and/or services from
Seller;

NOW, THEREFORE, in consideration of the mutual promises and covenants
hereinafter set forth, the parties hereby agree as follows:

1.         DEFINITIONS

           As used herein, the following capitalized terms have the following
meanings:

1.1        "ADDITIONAL AFFILIATE" shall mean any entity designated by SprintCom
           and approved by Seller which has been licensed by the FCC or
           otherwise has the right to provide PCS in the United States, but
           which is not an Initial Affiliate provided that, (i) SprintCom or any
           Initial Affiliate has at least a ten percent (10%) equity ownership
           in such entity, (ii) such entity is controlled by or under the common
           control with SprintCom or any Initial Affiliate, or (iii) there
           exists between SprintCom and the entity an Additional Affiliate
           Arrangement.

1.2        "ADDITIONAL AFFILIATE ARRANGEMENT" shall mean a formal arrangement
           related to or in connection with SprintCom's buildout of the
           Nationwide Network or any part thereof between SprintCom and a party
           to be designated an Additional Affiliate

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           under the terms of SprintCom Contract, which arrangement will
           include, an agreement on marketing and any one or more of the
           following: backhaul, common billing, resale agreements and/or revenue
           sharing; provided that roaming agreements and/or arrangements alone
           will not by themselves constitute Additional Affiliate Arrangements.

1.3        "ADD-ON EQUIPMENT" shall mean the Equipment other than that
           comprising a portion of the Initial System, which Equipment requires
           Seller's engineering and Installation/Commissioning Services.

1.4        "ADJUNCT PLATFORM" shall mean third party hardware and/or software,
           onto which Seller has added software in support of the applications
           listed in Annex 7 hereof ("Value-added Software") and in some cases,
           integrated such third-party hardware and Value-added Software into a
           system providing peripheral functionality for the DMS-MTX, all more
           fully described in Annex 7, "Adjunct Platforms."

1.5        "AFFILIATES" shall mean the collective reference to the Initial
           Affiliates and the Additional Affiliates.

1.6        "APPLICABLE PERMITS" shall mean any waiver, exemption, zoning,
           building, variance, franchise, permit, authorization, approval,
           license or similar order of or from any North American or foreign,
           federal, state, provincial, county, municipal, regional,
           environmental or other governmental body, instrumentality, agency,
           authority, court or other body having jurisdiction over all or any
           part of any PCS System, the Nationwide Network or the Work to be
           performed pursuant to the terms of this Agreement.

1.7        "APPROVED CIQ" shall mean a Customer Information Questionnaire for
           ordered DMS-MTX(s) or BSCs, which such Customer Information
           Questionnaire has been executed by authorized representatives of both
           parties.

1.8        "BASE STATION CONTROLLER (`BSC')" shall mean Seller engineered
           Equipment providing radio channel management between the Switch and
           the BTS. The BSC includes the Base Station Manager ("BSM").

1.9        "BASE TRANSCEIVER STATION (`BTS')" shall mean Seller engineered
           Equipment, controlled by the BSC, providing the radio link with
           mobile subscribers.

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1.10       "CODE DIVISION MULTIPLE ACCESS (`CDMA')" shall mean CDMA-based
           telecommunication services provided by the System, operational in the
           1900 MHz band.

1.11       "COMMISSIONING" shall mean the on-site validation of Equipment
           performance by Seller in accordance with the standard test procedures
           of Seller and/or the applicable OEM Equipment vendor, as such
           procedures are more fully described in Section 14.1 and Schedule B of
           Annex 2 hereof; provided, however, that validation of certain OEM
           Equipment (i.e., Commissioning Criteria not included under Schedule B
           of Annex 2) may be at additional charge to Buyer.

1.12       "DATABASE ENGINEERING" shall mean the Services provided by the Seller
           with respect to the creation and integration of the configuration
           files and datafill required to operate Equipment, pursuant to a
           Purchase Order accepted by Seller.

1.13       "DEFECTS AND DEFICIENCIES" "DEFECTS OR DEFICIENCIES," OR "DEFECTS"
           shall mean any one or a combination of the following items: (a) when
           used with respect to the performance of Services (including
           performance by Seller's subcontractors), such Services that are not
           provided in a workmanlike manner and in accordance with the standards
           and/or specifications set forth herein; (b) when used with respect to
           structures, materials, and Equipment (whether provided by Seller or
           Seller's subcontractors), such items that are not new and of good
           quality and free from improper workmanship and defects in accordance
           with the standards and/or specifications set forth herein or
           established hereunder and standards of good procurement,
           manufacturing and construction; (c) in general, (i) Work (including
           Work by Seller's subcontractors) that does not conform to the
           specifications and/or requirements of this Agreement, or (ii) any
           engineering, start-up activities, materials, Equipment, tools,
           supplies, or training, as applicable, that (1) does not conform to
           the standards and/or specifications set forth herein or established
           hereunder, (2) has inferior workmanship, or (3) would materially and
           adversely affect the ability of Equipment and/or Services to meet the
           applicable performance criteria specified herein on a consistent and
           reliable basis.

1.14       "DESIGNATED SWITCH SITE" shall mean with respect to the DMS-MTX, the
           location designated by the Buyer to the Seller in the applicable
           DMS-MTX Purchase Order to which the Seller is required to deliver,
           Install and Commission such DMS-MTX.

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1.15       "DOCUMENTATION" shall mean System documentation, whether in written
           or electronic form, delivered to Buyer in the medium set forth in
           Buyer's Purchase Order, such media being more fully described in
           Annex 6, "Documentation." All Documentation delivered to Buyer shall
           be subject to any copyright and confidentiality restrictions.

1.16       "EQUIPMENT" shall mean either singularly or collectively the
           Nortel-manufactured Hardware and Software products provided
           hereunder. The terms of this Agreement applicable to "Equipment"
           shall also be deemed to apply to OEM Equipment, unless otherwise
           expressly excluded in this Agreement and subject to the limitations
           set forth in Subsection 2.1.5.

1.17       "HARDWARE" shall mean the Nortel manufactured CDMA 1900 MHz hardware
           components as may comprise a System, Add-on Equipment, or
           Merchandise.

1.18       "INITIAL AFFILIATES" shall mean the collective reference to those
           companies listed in Schedule 3 of the SprintCom Contract.

1.19       "INITIAL SYSTEM" shall mean the System and Services initially being
           provided hereunder as set forth in Article 1 of Annex 1.

1.20       "INSTALLATION" shall mean the installation of Equipment by Seller as
           set forth in Schedule B of Annex 2.

1.21       "INSTALLATION SITE" shall mean the location (continental United
           States) specified in Buyer's Purchase Order for Installation of
           Equipment.

1.22       "MERCHANDISE" shall mean miscellaneous components of Hardware, with
           respect to which no engineering, Installation, or Commissioning are
           to be provided by Seller.

1.23       "MTA" shall mean major trading area as defined by the FCC.

1.24       "NATIONWIDE NETWORK" shall mean all of the PCS Systems built or to be
           owned and/or operated by SprintCom or its Affiliates in Canada,
           Mexico and the United States.

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1.25       "NETWORK" shall mean Buyer's System dimensioned by Seller to
           interconnect to the PSTN and intra-System nodes (i.e., MTX, BSC,
           BTSs) and to such other nodes which may be further defined.

1.26       "NETWORK ENGINEERING" shall mean those network engineering Services
           provided by Seller as described in Schedule A of Annex 2, pursuant to
           a Purchase Order accepted by Seller.

1.27       "OEM EQUIPMENT" shall mean miscellaneous items of non-Nortel
           equipment made available for sale to Buyer by Seller under this
           Agreement, not integrated into the Hardware during the manufacturing
           process.

1.28       "PCS SYSTEM" shall mean all Equipment, tools and Software, all system
           locations and any property located thereat necessary or required to
           provide personal communications services in a given specified
           geographic area, as defined in the SprintCom Contract.

1.29       "PROJECT SCHEDULE" shall mean those delivery, installation and/or
           in-service dates agreed to by Buyer and Seller.

1.30       "PURCHASE CREDITS" shall mean credits to be applied towards the
           purchase of CDMA 1900 Equipment and related Installation and
           Commissioning Services under this Agreement as described in Article
           5.

1.31       "PURCHASE ORDER" shall mean any purchase order issued by Buyer
           hereunder to Seller pursuant to Article 3 of this Agreement.

1.32       "RF ENGINEERING SERVICES" shall mean those RF Engineering Services
           provided by Seller pursuant to Schedule A of Annex 2, pursuant to a
           Purchase Order accepted by Seller.

1.33       "SERVICES" shall mean those services performed by Seller under this
           Agreement.

1.34       "SHIP DATE" shall mean the scheduled date agreed upon by Buyer and
           Seller as the date on which the appropriate Equipment shall be
           shipped.

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1.35       "SOFTWARE" shall mean (a) the proprietary and/or third party software
           computer programs (consisting of firmware and logic instructions in
           machine-readable code residing in, or intended to be loaded in
           Hardware memories which provide basic logic, operating instructions
           and user-related application instructions, but excluding customer
           data) as well as associated documentation used to describe, maintain
           and use the programs which are integral to any Hardware furnished to
           Buyer, and (b) any Software Enhancements, Software Release and
           Software Upgrades furnished to the Buyer hereunder. Any reference
           herein to Equipment or Software being "sold," "purchased" or the like
           is understood to be a reference in fact to the program being
           licensed.

1.36       "SOFTWARE COMBINED RELEASE" has the meaning ascribed thereto in
           Section 12.3.

1.37       "SOFTWARE ENHANCEMENTS" shall mean modifications or improvements made
           to the Software which improve performance or capacity of the Software
           or which provide additional functions to the Software.

1.38       "SOFTWARE RELEASE" shall mean (a) the base operating Software for
           each of the Switch, BSC and/or BTS Equipment, together with certain
           standard incremental subscriber and/or carrier software features
           included at Seller's sole discretion, such base operating Software
           and standard subscriber and/or carrier features together forming a
           base load ("Base Load") as well as, (b) in addition to the Base Load,
           certain features that may be activated in increments at Buyer's
           option ("Optional Features") upon payment of the applicable fees,
           including by way of example and not by limitation, Software features
           associated with an Adjunct Platform, which may include Value-added
           Software, as described in Annex 7 hereof.

1.39       "SOFTWARE UPGRADES" shall mean periodic updates to the Software
           issued by the Seller to the Buyer under Warranty and Software
           maintenance obligations to correct Defects or Deficiencies in the
           Software (which may be referred to by the Seller as "patches").

1.40       "SPECIFICATIONS" shall mean the specifications and performance
           standards of the Equipment as set forth in the applicable sections of
           Northern Telecom Practices ("NTPs"), incorporated herein by
           reference, including statements in the NTPs as to conformance with
           specific Standards. Seller shall have the right, at its sole
           discretion to modify, change or amend the Specifications at any time
           so long as

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           such modification does not result in a material, service-effecting
           degradation in the performance of Buyer's Equipment.

1.41       "SPRINTCOM" shall mean SprintCom Inc., a Kansas corporation.

1.42       "STANDARDS" shall mean interim and/or final version(s) of technical
           specifications derived by an ANSI accredited standards organization,
           governing the operational and/or interface standards for CDMA 1900
           equipment.

1.43       "STANDING TIME" shall mean any interruption or delay in the Project
           Schedule caused by Buyer.

1.44       "SWITCH" shall mean a Seller engineered DMS-MTX providing CDMA 1900
           switching functions.

1.45       "SYSTEM" shall mean the combination of a Switch, and each of one or
           more BSC(s) and BTS(s) furnished hereunder.

1.46       "TERM" shall mean the period commencing on the date first set forth
           above (hereinafter "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 agreement of the
           parties hereto.

1.47       "WORK" shall mean performance of the Services as described in
           Annex 2.

2.         SCOPE

2.1        During the Term, in accordance with a Purchase Order for Equipment
           and/or Services which has been accepted by Seller, Seller shall:

2.1.1      provide Network Engineering and RF Engineering Services in accordance
           with Schedule A of Annex 2;

2.1.2      engineer, deliver, Install (or have installed) and Commission
           Equipment for use in the continental United States;

2.1.3      upon payment of the applicable fees, and in accordance with Annex 5
           hereof, grant to Buyer a nonexclusive license to use all Software
           associated with, and integral to, Hardware purchased by Buyer
           hereunder;

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2.1.4      carry out the Installation and Commissioning of Equipment at the
           applicable Installation Site substantially in accordance with the
           applicable Project Schedule set forth in Schedule B of Annex 2 and in
           accordance with the relevant Purchase Orders;

2.1.5      furnish OEM Equipment to Buyer, including Adjunct Platforms, subject
           to such OEM vendor's then-current applicable terms, conditions and
           specifications, and in the case of Adjunct Platforms, in accordance
           with the terms set out in Annex 7, "Adjunct Platforms";

2.1.6      for System purchases, provide Buyer with on-site technical support in
           accordance with Schedule C of Annex 2.

2.2        During the Term, in accordance with a Purchase Order for Equipment
           and/or Services which has been accepted by Seller, Buyer shall:

2.2.1      Purchase Equipment and Services including all Services required for
           the Installation and Commissioning of all Switch and Switch-related
           Equipment, and license use of the Software as listed in and described
           in Annex 1 in accordance with the terms of this Agreement.

2.2.2      Perform Buyer's duties as set forth in this Agreement, including by
           way of example, but not by way of limitation, those duties set forth
           in Annex 2 in accordance with the Project Schedule;

2.2.3      Insure that only qualified technicians perform any maintenance and/or
           repair to the Equipment during the Hardware Warranty Period, which
           maintenance and/or repair shall be confined to routine tasks
           performed in accordance with Seller provided documentation;

2.2.4      Not unreasonably withhold Acceptance, as defined in Article 14.

3.         PURCHASE ORDERS

3.1        Notwithstanding that a Purchase Order may not refer to this
           Agreement, any Purchase Order for Equipment and/or Services issued
           during the Term of this Agreement shall be deemed to have been issued
           pursuant to this Agreement and

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           shall be governed by the terms and conditions of this Agreement,
           unless the parties expressly agree to the contrary in writing (duly
           signed by authorized representatives of both parties). Buyer hereby
           expressly agrees that except for non-conflicting administrative terms
           as provided below, any additional or preprinted terms or conditions
           on the applicable Purchase Order, shall be null, void and of no
           effect. Each such Purchase Order shall specify:

3.1.1      The description of the ordered Equipment and/or Services, including
           any identification referenced in the price list herein attached as
           Annex 1;

3.1.2      Requested place and date of delivery as previously agreed by Seller;

3.1.3      Applicable Price for the ordered Equipment and/or Services as set
           forth in Annex 1 or as may be separately quoted by Seller from time
           to time;

3.1.4      Prices for Network Engineering Services, RF Engineering Services, and
           Equipment Installation and Commissioning to be quoted by Seller,
           together with a mutually agreed Installation and Commissioning
           schedule;

3.1.5      Installation Site(s) where applicable;

3.1.6      Other appropriate information as may be required by Seller necessary
           to fill the Purchase Order such as Buyer's floor plan and frequency
           plan; and

3.1.7      Location to which the applicable invoice shall be rendered for
           payment.

3.2        Any Purchase Order issued by Buyer and not rejected in writing within
           ten (10) business days after receipt by Seller shall be deemed
           accepted.

4.         PRICE

4.1        As set forth in Annex 1, the price ("Price") for any Equipment and
           Services shall consist of (i) the Price of the Initial System
           Purchase Order or any subsequent Purchase Orders; (ii) unit list
           Prices for Hardware, Merchandise, and Services; (iii) license fees to
           use the Software associated with such Hardware; and (iv) for OEM
           Equipment and Services, the Prices as may be quoted by Seller from
           time to time.

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4.2        Unless otherwise specified, the Prices set forth in Annex 1 are
           exclusive of Seller's charges for any Services associated therewith.

4.3        The Prices are exclusive of any taxes, which shall be the
           responsibility of Buyer pursuant to Section 6.4 hereof.

5.         SELLER FINANCING

5.1        Buyer understands and agrees that the execution of this Agreement
           constitutes a firm non-cancelable Purchase Order for the Initial
           System set forth in Article 1 of Annex 1; provided, such
           non-cancelable Purchase Order shall be subject to the execution of
           the financing agreement between Buyer and Seller as hereinafter
           described.

5.2        Seller shall have no obligation to ship the Initial System or any
           portion thereof, until such time as either (i) Seller has formally
           committed a financing facility to the Buyer which is satisfactory to
           Seller, such facility having been approved by Seller's senior
           management, and all preconditions to such financing have been
           satisfied; or (ii) Seller determines that Buyer has completed a
           financing facility with a third party reasonably satisfactory to
           Seller, such facility is available to be drawn upon, and all
           preconditions to such financing have been met. Buyer shall provide
           all reasonable assistance requested by Seller necessary for Seller to
           make such determination including the necessary documentation to
           evaluate the financial soundness of any third party lender providing
           financing for Buyer's purchases hereunder. Seller shall have no
           obligation to ship any additional Equipment or perform any additional
           Services until such time as Seller has accepted Purchase Orders with
           respect thereto and subject to any credit arrangements agreed upon in
           connection with such Purchase Orders.

5.3        Buyer agrees to purchase and take delivery of Equipment and Services
           in a net amount (net Price, after applicable Equipment discounts, but
           exclusive of sales taxes) totaling not less than seventy-two million
           dollars ($72,000,000) during the Term ("Volume Commitment");
           provided, such Volume Commitment is subject to the execution of the
           financing agreement between Buyer and Seller as described above. Only
           Purchase Orders issued under this Agreement shall accrue toward the
           Volume Commitment.

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5.4        The Price for any Equipment and Services purchased under this
           Agreement and financed by Seller shall include an additional three
           percent (3.0%) ("Financing Premium") over Additional Affiliate
           pricing as set forth in Annex 1.

5.5        On March 1, 2000, Seller will make available as Purchase Credits an
           aggregate amount of two hundred and forty-three thousand dollars
           ($243,000). Such Purchase Credits may be applied to any Purchase
           Order issued hereunder for Seller's Equipment and/or Services after
           March 1, 2000 and continuing throughout the remainder of the Term or
           until the total amount of Purchase Credits has been expended,
           whichever occurs first; provided, however, such Purchase Credits
           shall not reduce the Price of any Purchase Order by more than fifty
           percent (50%).

5.6        Notwithstanding the foregoing, Buyer expressly acknowledges that
           Seller makes no commitment and has no obligation whatsoever to
           provide financing to Buyer under this Agreement and any such
           commitment on the part of Seller shall be made only in separate
           financial agreement.

6.         PAYMENT

6.1        With respect to Purchase Orders for Equipment that include
           Installation and Commissioning Services therefor, Buyer shall pay
           Seller the Price in accordance with the following schedule:

6.1.1      Equipment and Services

6.1.1.1    100% of the Equipment Price contained in Purchase Orders shall be
           invoiced by Seller incrementally upon shipment of the Equipment.

6.1.1.2    100% of the Services prices contained in Purchase Orders shall be
           invoiced by Seller, (i) upon completion of such Service or, (ii) for
           that amount which is equal to the percentage of Services completed at
           the end of each month in which such Service(s) were performed,
           whichever occurs first.

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6.1.2      Software Fees

6.1.2.1    100% of the first Software Fee (as defined in Section 2.5 of Annex 1)
           applicable to each DMS-MTX will not be invoiced until the earlier of
           (i) the commercial, revenue-producing service of each DMS-MTX; or
           (ii) ninety (90) days after Buyer's Acceptance of Sellers
           Installation of such DMS-MTX pursuant to Schedule B of Annex 2;
           thereafter, annual Software Fees for any such DMS-MTX will be
           invoiced annually on the anniversary date of such first invoice.

6.2        Any additional monies that become due to Seller (including, without
           limitation, Merchandise orders, freight, such items as are described
           in Section 6.4, Software Release license fees described in Article 2
           of Annex 1, Equipment purchases wherein Installation is not provided
           by Seller, or OEM Equipment not part of the original System order)
           shall be invoiced one hundred percent (100%) upon shipment or, in the
           case of Software license fees other than the Software Fee, upon
           implementation of such Software. Any cancellation charges due Seller
           pursuant to Section 17.5 shall be invoiced upon receipt of Buyer's
           written cancellation notice. Incidental and/or additional Services
           not included under Section 6.1 shall be invoiced monthly as performed
           or upon completion, whichever occurs first.

6.3        Buyer shall pay all amounts invoiced by Seller pursuant to this
           Article 6 within thirty (30) days from the date of Seller's invoice
           therefor. All past due amounts (collectively, "Past Due Amounts")
           shall bear interest at the rate of one and one-half percent(1 1/2%)
           per month (or such lesser rate as may be the maximum permissible rate
           under applicable law), beginning with the date on which the
           applicable Past Due Amount was due and payable.

6.4        Buyer shall promptly reimburse and/or pay Seller, upon demand, or
           shall pay directly, if so requested by Seller, all taxes and charges,
           including without limitation, penalties and interest, imposed by any
           federal, state, or local governmental or taxing authority, relating
           to the purchase, license, ownership, possession, use, operation or
           relocation of Equipment or Services provided by Seller under this
           Agreement, excluding, however, all taxes computed upon the net income
           of Seller; provided, however, Seller shall be responsible for any
           additional

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<PAGE>   16

           penalties or interest imposed by any governmental or taxing authority
           due solely to Seller's failure to timely notify Buyer of such taxes
           and charges or to take such other timely action as may be required
           with respect to any such taxes that Seller is required by law to
           collect. To the extent Seller is required by law to collect such
           taxes (state or local), one hundred percent (100%) thereof shall be
           added to invoices as separately stated charges and paid in full by
           Buyer, unless the Buyer is exempt from such taxes and furnishes
           Seller with a certificate of exemption in a form reasonably
           acceptable to Seller prior to issuance of such invoice. Each party
           shall hold the other party harmless from any and all claims levied by
           a proper taxing authority for such taxes, including any interest,
           penalties or late charges due to the other party's failure to perform
           hereunder. Each party's obligations pursuant to this Section 6.4
           shall survive the expiration of termination of this Agreement.

6.5        Until the total Price for each Purchase Order is paid to Seller,
           Seller shall retain and Buyer hereby grants to Seller a purchase
           money security interest in the Equipment, and Buyer shall cooperate
           with Seller in perfecting such interest.

6.6        Prior to payment in full of the Price and all additional monies due
           to Seller, without written permission of Seller, Buyer shall not sell
           or lease Equipment purchased by it, or assign any license to use the
           Software, or allow any liens or encumbrances to attach to any such
           Equipment, or remove such Equipment or Software from the Installation
           Site.

6.7        Seller reserves the right to require reasonable assurances of payment
           by Buyer as a condition to accepting certain Purchase Orders. Seller
           may, from time to time, evaluate Buyer's credit standing, and on that
           basis, establish a credit limit to accommodate Buyer's issuance of
           Purchase Orders as herein provided.

7.         DELIVERY, RISK OF LOSS, TITLE

7.1        Equipment shall be priced and shipped F.O.B. place of shipment.
           Seller will pre-pay freight charges from the place of shipment and
           invoice such charges back to Buyer. Switch and/or BSC Equipment shall
           be shipped to the Installation Site(s). BTS Equipment shall be
           shipped to Buyer's designated delivery location (i.e., a staging
           center or warehouse). Buyer shall be responsible for the coordination
           of all BTS delivery arrangements required to comply with Project
           Schedule dates and for

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           freight and handling charges from Buyer's delivery location to the
           Installation Sites.

7.2        Title to Equipment furnished by Seller to Buyer in accordance with
           this Agreement shall pass to Buyer at the point and on the date of
           shipment. Risk of loss or damage to such Equipment shall pass to
           Buyer upon delivery of such Equipment at the initial destination
           specified in Buyer's Purchase Order. Seller warrants to Buyer that
           such title shall be good and clear title, free and clear of all liens
           and encumbrances. The foregoing notwithstanding, title to Software
           shall not pass to Buyer at any time.

7.3        Not later than thirty (30) days prior to the earliest Ship Date
           relating to any of the items covered by the applicable Purchase
           Order, Buyer may notify Seller that Buyer (i) does not wish to
           receive shipment of any Equipment on the Ship Date, or (ii) that
           Buyer's facilities are not prepared pursuant to Annex 2 hereof in
           sufficient time for Seller to make delivery pursuant to the Ship
           Date. In such case Seller shall have the right to place such
           Equipment in storage and Buyer shall be liable for all additional
           transportation, demurrage, loading, storage, and associated costs
           thereby incurred by Seller. The shipment of Equipment to a storage
           location as provided in this Section 7.3 shall be deemed to
           constitute shipment and/or delivery of the Equipment for purposes of
           invoicing as set forth in Section 6.1.1.1, passage of title and risk
           of loss, and commencement of the Hardware Warranty Period.

8.         WARRANTIES, REMEDIES AND LIMITATION OF WARRANTIES AND REMEDIES AND
           DISCLAIMERS OF WARRANTIES AND LIABILITY

8.1        Hardware Warranty

8.1.1      Seller warrants that for a period of two (2) years from the date of
           Buyer's Acceptance of the Hardware furnished under this Agreement
           ("Hardware Warranty Period"), shall be free from defects in material
           and workmanship, and shall conform to the applicable portions of the
           Specifications. Any and all claims for breach of this warranty are
           conclusively deemed waived unless made during the Hardware Warranty
           Period. Performance of Seller's obligations hereunder shall not
           extend the Hardware Warranty Period, except that any Hardware
           repaired, replaced or corrected during this period shall continue to
           be warranted for the balance of the Hardware Warranty Period.

                                       14
<PAGE>   18

8.2        Service Warranty

8.2.1      Seller warrants that for a period of one (1) year from the date of
           completion of such Service ("Service Warranty Period"), including
           Installation and Commissioning, as the case may be, provided by the
           Seller to the Buyer pursuant to the terms of this Agreement, such
           Services will be, (i) in accordance with the applicable
           Specifications, (ii) in compliance with all material applicable laws
           and material Applicable Permits in effect at the time of the
           completion of such Services, and (iii) free from Defects or
           Deficiencies in design, materials, workmanship or otherwise.

8.3        Software Warranty

           Seller warrants that for a period of two (2) years commencing on the
           date of Seller's Acceptance of the Software ("Software Warranty
           Period"), provided the Software is not altered by Buyer, and provided
           the Software is used in conjunction with the Hardware purchased under
           this Agreement and such Hardware has been maintained in accordance
           with Seller's recommended maintenance procedures, the Software shall
           function during the Software Warranty Period without defects which
           materially affect Buyer's use of the Software in accordance with
           Seller's Specifications for the Software. In the event the Software
           fails to so perform and Buyer's use of the System is materially
           affected by such failure, Buyer's exclusive remedy under this
           warranty is to require Seller to correct such failure and such remedy
           is conditioned upon Seller's receiving written notice (or oral notice
           promptly confirmed in writing) within this period of such failure.
           The correction of any Software failure shall not extend the Software
           Warranty Period.

8.4        Seller's sole obligation and Buyer's exclusive remedy under this
           warranty are limited to the replacement or repair, at Seller's
           option, of the defective Hardware component, or the correction of
           Software failures or faulty Services. Such replacement Hardware may
           be new or reconditioned to perform as new, at Seller's option. Buyer
           shall be responsible for deinstallation of any such defective
           Hardware and reinstallation of any replacement Hardware, as well as
           risk of loss and transportation costs for defective Hardware shipped
           to Seller. Seller shall bear the risk of loss and transportation
           costs for replacement Hardware shipped to Buyer.

                                       15
<PAGE>   19

           Title to defective or replacement Hardware shall pass to Seller or
           Buyer, as appropriate, upon receipt thereof.

8.5        Response Services/Time

8.5.1      During the Warranty Period, Seller's technical assistance service
           ("TAS") department shall provide reasonable assistance in the
           investigation and resolution of service-affecting warranty Defects
           and/or Deficiencies. If such assistance is requested by Buyer, Buyer
           agrees to follow Seller's standard policies and procedures related to
           such TAS services as set forth in Annex 4, "Seller Warranty
           Services." The Hardware Warranty Period shall include TAS only to the
           extent that any TAS services provided under the Switch warranty also
           apply to Hardware operating in conjunction with the applicable
           Switch. For routine warranty service situations, Seller shall ship
           replacement or repaired Hardware (or components thereof) within
           thirty (30) days of receipt of the defective Hardware (or components
           thereof) from Buyer.

8.5.2      For emergency warranty service situations, Seller shall, during the
           Hardware Warranty Period, use all reasonable efforts to ship
           replacement Hardware (or components thereof) within twenty-four (24)
           hours of notification of the warranty Defect and/or Deficiency by
           Buyer. Buyer shall pay to Seller the surcharge set forth in Annex 4,
           for such expedited shipment of replacement Hardware. Buyer shall ship
           the defective Hardware to Seller within thirty (30) days of receipt
           of the replacement Hardware. In the event Seller fails to receive
           such defective Hardware within such thirty (30) day period, Seller
           shall invoice Buyer for the replacement Hardware at the then-current
           price in effect therefor. For the purpose of this Agreement, an
           emergency shall be deemed to exist upon the occurrence of a Priority
           E1 or E2 problem, as defined in Annex 4.

8.6        OEM Equipment

8.6.1      Miscellaneous OEM Equipment furnished in conjunction with a Switch,
           (i.e., terminals and printers), shall be warranted in accordance with
           the Hardware warranties set forth in Section 8.1 and handled through
           Seller's Repair and Return

                                       16
<PAGE>   20

           department. With respect to all other OEM Equipment ordered by Buyer,
           OEM Equipment shall be warranted directly by such OEM vendors in
           accordance with their standard terms and conditions, including by way
           of example and not by limitation, such vendor's standard response
           time(s) and procedure(s) for repair and return. Except for the
           warranty of title extended in Section 6.2 hereof, the warranties
           provided in this Section 8.6 are Buyer's sole and exclusive remedy
           with respect to OEM Equipment provided by Seller under this
           Agreement.

8.7        THE WARRANTIES AND REMEDIES SET FORTH ABOVE CONSTITUTE THE ONLY
           WARRANTIES WITH RESPECT TO THE EQUIPMENT AND SERVICES PROVIDED, AND
           BUYER'S EXCLUSIVE REMEDIES IN THE EVENT SUCH WARRANTIES ARE BREACHED.
           THEY ARE IN LIEU OF ALL OTHER WARRANTIES WRITTEN OR ORAL, STATUTORY,
           EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE WARRANTY OF
           MERCHANTABILITY AND THE WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
           SELLER SHALL NOT BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, OR
           SPECIAL DAMAGES OF ANY NATURE WHATSOEVER.

8.7.1      Seller's obligations under this Article 8 shall not apply to (i)
           Equipment or components thereof such as fuses and bulbs that are
           normally consumed in operation, or have a normal life inherently
           shorter than the Hardware Warranty Period; (ii) defects that are the
           result of improper storage, installation, use, maintenance or repair
           by the Buyer (including, without limitation, operation of the
           Equipment outside the environmental parameters defined in the
           Specifications); (iii) improper operation of Equipment with other
           hardware or software used by Buyer, including the operation of
           Equipment with hardware or software not authorized by Seller for use
           with the Equipment, or use of the Equipment with any improperly
           operating hardware or software not supplied by Seller under this
           Agreement; (iv) Equipment or components thereof that due to no fault
           of Seller have been subjected to any other kind of misuse or
           detrimental exposure or have been involved in an accident, fire
           explosion, any other cause not attributable to Seller, or Act of God,
           or (v) Equipment or Installation Services altered, repaired,
           installed or relocated by any party other than Seller or Seller's
           agents. For purposes of subsection (v), "install" shall not mean the
           routine plug-in of the components done in accordance with NTP
           guidelines.

                                       17
<PAGE>   21

9.         FORCE MAJEURE

           If the performance of this Agreement, or of any obligation hereunder
           except for the obligations set forth in Article 4 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, then
           the party affected, upon giving prompt notice to the other party, as
           set forth in Section 23.2 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 causes of
           non-performance and both parties shall proceed to perform their
           obligations with dispatch whenever such causes are removed or cease.

10.        PATENT OR COPYRIGHT INFRINGEMENTS

10.1       Seller agrees to indemnify Buyer with respect to any suit, claim, or
           proceeding brought against Buyer alleging that Buyer's use of the
           Equipment constitutes an infringement of any United States patent or
           copyright. Seller agrees to defend Buyer against any such claims and
           to pay all litigation costs, reasonable attorney's fees, settlement
           payments and any damages awarded in any final judgment arising from
           such suit, claim or proceeding; provided, however, that Buyer shall
           promptly advise Seller of any such suit, claim, or proceeding and
           shall cooperate with Seller in the defense or settlement of such
           suit, claim or proceeding and provided Seller shall have sole control
           thereof.

10.2       In the event that an injunction is obtained against Buyer's use of
           Equipment arising from such patent or copyright suit, claim or
           proceeding, in whole or in part, Seller shall, at its option, either:
           (i) procure for Buyer the right to continue using the portion of a
           System enjoined from use; or (ii) replace or modify the same so that
           Buyer's use is not subject to any such injunction.

                                       18
<PAGE>   22

10.3       In the event that Seller cannot perform under Section 10.2, Buyer
           shall have the right to return such Equipment or portion thereof to
           Seller upon written notice to Seller and in the event of such return,
           neither party shall have any further liabilities or obligations under
           this Agreement, except that Seller shall refund the depreciated value
           of any such Equipment or portion thereof as carried on the Buyer's
           books at the time of such return.

10.4       Seller's indemnity obligations under Section 10.1 shall not apply to
           infringement claims (i) arising from any portion of the Equipment
           that is manufactured to Buyer's design, (ii) arising from the use of
           the Equipment in combination with any other apparatus or material not
           supplied by Seller to the extent that the claims arise from such
           combination usage, or (iii) alleging that method of use claims in
           such patent are infringed by any service offering and/or by any use
           by Buyer of Equipment furnished hereunder to make such service
           offering available to the extent such service offering or use is not
           described by Seller in its Specifications.

10.5       The foregoing states the entire liability of Seller for patent or
           copyright infringement by the Equipment. Seller shall have no
           liability whatsoever for any patent or copyright infringement arising
           from Buyer's use of the OEM Equipment, and Seller makes no warranty
           with respect thereto.

11.        SOFTWARE LICENSE

11.1       With respect to Equipment containing Software acquired under this
           Agreement and upon payment of the appropriate license fees as set
           forth in Section 2.5 of Annex 1, Buyer is hereby granted a
           non-exclusive, non-transferable (except as set forth in Annex 5)
           license to use the Software in accordance with the terms set forth in
           Annex 5, "Software License." Buyer is granted no title or ownership
           rights to the Software, which rights shall remain in Seller or
           Seller's suppliers as appropriate. The license fees paid by Buyer
           shall cover fees for Software as described in Section 2.5 of Annex 1.

11.2       The obligations of Buyer under this Article 11 and Annex 5 shall
           survive the expiration or termination of this Agreement.

                                       19
<PAGE>   23

12.        SOFTWARE CHANGES

12.1       Software Upgrades will be provided by Seller at no charge to Buyer
           during the Software Warranty Period.

12.2       Software Enhancement license fees shall be quoted by Seller at
           Buyer's request and assume that Buyer's System is operating on
           Software at the same level of maintainability as set forth in Section
           12.4. Otherwise, retrofitting features from a new Software Release
           onto Buyer's System shall be considered and quoted by Seller on a
           case-by-case basis. Additionally, future Hardware purchases may
           require the support of a then-current Software Release. Buyer
           acknowledges that any Software Enhancement may require the purchase
           of additional Hardware by Buyer.

12.3       In the event the Seller at any time issues a Software Upgrade which
           is combined with any Software Enhancement (collectively the "Software
           Combined Release") to such Software, the Software Combined Release
           will be quoted by Seller at Buyer's request.

12.4       If Buyer elects to remain on a prior Software Release, Seller's sole
           obligation hereunder shall be to make available maintenance for the
           Software for the previous two consecutive releases from the
           then-current, Seller-numbered release (i.e., numbered Software
           Release).

12.5       Buyer further acknowledges that the proper operation of the Equipment
           and/or the availability of certain Optional Features is dependent
           upon having the appropriate Software Release installed, as
           applicable, to the Switch, BSC and/or BTS Equipment.

13.        REMEDIES

13.1       In the event Buyer ceases to be an Additional Affiliate, Seller shall
           have the right to immediately terminate this Agreement in its
           entirety upon written notice to Buyer, provided, however, the parties
           may mutually agree to modify the Agreement establishing new
           non-Additional Affiliate prices, terms and conditions.

13.2       Seller shall have the right to suspend its performance under this
           Agreement by written notice to the Buyer and forthwith remove and
           take possession of any portion of the Equipment that has been
           delivered if the Buyer, prior to payment to Seller of

                                       20
<PAGE>   24

           the Price, shall become insolvent or bankrupt, make a general
           assignment for the benefit of, or enter into any arrangement with
           creditors, file a voluntary petition under any bankruptcy,
           insolvency, or similar law, or have proceedings under any such laws
           or proceedings seeking appointment of a receiver, trustee or
           liquidator instituted against it which are not terminated within
           thirty (30) days of such commencement.

13.3       In the event of any material breach of this Agreement by either party
           which shall continue for thirty (30) or more days after written
           notice of such breach (including a reasonably detailed statement of
           the nature of such breach) shall have been given to the breaching
           party by the aggrieved party, the aggrieved party shall be entitled
           at its option:

13.3.1     if the aggrieved party is the Buyer, to suspend its performance under
           Article 6 with regard to Equipment or Services affected by the breach
           of the Agreement for so long as the breach continues uncorrected or;

13.3.2     if the aggrieved party is Seller, to suspend performance of all of
           its obligations under the Agreement for so long as the breach
           continues uncorrected or;

13.3.3     to avail itself of any and all remedies available at law or equity
           whether or not it elects to suspend its performance under Subsection
           13.3.1 or 13.3.2 as applicable.

13.4       EXCEPT WITH RESPECT TO A BREACH OF ARTICLE 11, SOFTWARE LICENSE, OR
           ARTICLE 20, CONFIDENTIALITY, NEITHER PARTY SHALL BE LIABLE FOR
           INCIDENTAL, INDIRECT, CONSEQUENTIAL, OR SPECIAL DAMAGES OF ANY NATURE
           WHATSOEVER FOR ANY ACTION OR INACTION ARISING UNDER THIS AGREEMENT.

13.5       Any action for breach of this Agreement or to enforce any right
           hereunder shall be commenced within two (2) years after the cause of
           action accrues or it shall be deemed waived and barred (except that
           any action for nonpayment may be brought at any time permitted by
           applicable law).

14.        ACCEPTANCE TESTING

14.1       On completion of Installation of Equipment furnished and installed by
           Seller, Seller

                                       21
<PAGE>   25

           shall provide Buyer ten (10) working days prior written notification
           that such Equipment is ready for Commissioning. Following such
           notification, Buyer agrees to have a representative present to
           witness and acknowledge completion of such testing. Seller or
           Seller's subcontractor, as applicable, shall test the Equipment in
           accordance with its standard testing procedures to determine
           Equipment conformity with the standards and specifications
           (hereinafter "Commissioning Criteria") of the applicable Seller
           installation manuals, as may be amended from time to time.

14.2       On the date that such Commissioning has been successfully completed,
           Seller shall turn the Equipment over to Buyer ("Turnover"). On the
           date of Turnover, Buyer shall complete and return to Seller the
           "Turnover Notice" as described in Annex 3.

14.3       For purposes of this Agreement, the occurrence of any of the
           following shall be deemed to constitute "Acceptance" of the
           Equipment:

14.3.1     Within ten (10) working days following the date of Turnover, Buyer
           shall either accept the Equipment in writing as provided in Annex 3,
           "Acceptance Notice," or notify Seller in writing specifying in
           reasonable detail those particulars in which the Equipment does not
           meet the Commissioning Criteria. With respect to any such
           particulars, Seller shall promptly proceed to take corrective action,
           and following correction, Buyer shall accept the Equipment in
           writing.

14.3.2     The failure of Buyer to notify Seller within ten (10) working days
           after Turnover (or, in the case of correction, ten (10) working days
           following such correction) of any particulars in which the Equipment
           does not meet the Commissioning Criteria, or the use by Buyer of the
           Equipment or any portion thereof in revenue-producing service at any
           time, shall be deemed Acceptance of such Equipment.

14.4       Acceptance of Equipment not installed by Seller shall be deemed to
           occur upon receipt of and inspection by Buyer, but no later than five
           (5) days from receipt thereof. In the event of a defect in the
           Equipment, Buyer shall notify Seller in writing specifying, in
           reasonable detail, the defect within five (5) days

                                       22
<PAGE>   26

           of receipt or Acceptance shall be deemed to have occurred.

15.        COVERAGE, INTERFERENCE AND THIRD-PARTY FACILITIES

15.1       Seller shall have no liability as a result of non-performance,
           failures or poor performance of the System caused by, resulting from
           or attributable to Buyer-provided specifications or equipment
           configuration requirements, which are inconsistent with
           Specifications. Seller may rely upon and utilize any Buyer-provided
           designs, studies, specifications or requirements, including but not
           limited to microwave path studies, RF propagation studies and tower
           location and loading requirements, without liability for
           non-performance, failures or performance of the System caused by,
           resulting from or attributable to any such Buyer-provided designs,
           studies, specifications or requirements.

15.2       Seller shall not be responsible for any failures or inadequacies of
           performance resulting from equipment not supplied and installed by
           Seller or Seller's agents or subcontractors pursuant to this
           Agreement. Seller shall not be responsible for interference or
           disruption of service caused by operation of other radio systems,
           lightning, motor ignition or other similar interference. In the event
           Buyer utilizes facilities or services supplied by others such as
           common carrier circuits, antennas or towers, Buyer shall have the
           total responsibility for the availability or adequacy of such
           services or facilities.

16.        REGULATORY COMPLIANCE

16.1       Seller shall use all reasonable efforts to furnish and install
           Equipment so that it shall comply in all material respects with all
           Federal, State, and local laws and regulations in force on the
           Effective Date of this Agreement, which directly impose obligations
           upon the manufacturer, Seller, or installer thereof.

16.2       The Prices set forth for the Equipment described herein are based on
           Seller's design, manufacture, and delivery of the Equipment pursuant
           to its design criteria and manufacturing processes and procedures in
           effect on the Effective Date. If, as a result of the imposition of
           requirements by any Federal, State or local government during the
           Term of this Agreement there is a change in such criteria, processes
           or procedure or any change in the Equipment, the Prices will be
           adjusted equitably to

                                       23
<PAGE>   27

           reflect the added cost and expense of such change. Any such changes
           shall include, by way of example and not by way of limitation,
           mandatory compliance with Standards or government requirements.

17.        CHANGES

17.1       Up to ninety (90) days prior to the scheduled Ship Date (or such
           later time as is acceptable to Seller), Buyer may request Equipment
           addition(s) or deletion(s) to an original Equipment configuration.
           All such Equipment reconfigurations or changes to the Statement of
           Work or Project Schedule ("Changes") shall be subject to prior
           written approval of Seller.

17.2       Except as provided in 17.3 below, all Changes shall be documented in
           a written change order ("Change Order"), which shall be executed by
           Buyer and returned to Seller prior to implementation of the requested
           Changes. The Change Order shall detail any adjustments to the Price,
           Statement of Work or Project Schedule required by Seller for any
           aspect of its performance under this Agreement.

17.3       Buyer understands and agrees that the Price is based on Seller's
           providing the Services only as herein specified. Should any factors
           (e.g., changed site conditions) cause an increase in the extent of
           Services to be provided, Seller may, without liability, temporarily
           suspend performance and promptly notify Buyer of such factors and
           request a Change Order to reflect any increased costs of Seller's
           performance and/or Seller's performance of additional Services. Upon
           Buyer's authorization, such Changes shall be documented in a Change
           Order. Seller shall also be granted an equitable extension in the
           time for performance due to the occurrence of any such changed
           conditions or other factors outside Seller's control.

17.3.1     Seller shall have no liability for delays caused by or attributable
           to obtaining FCC permits or other permits, certificates or
           applications requiring approval of local, state or federal agencies
           or for delays that occur due to Buyer's or Seller's or Seller's
           agent's inability to obtain clear title to real estate, local
           construction ordinances, or other similar obstructions relative to
           site acquisition. All such delays shall be regarded as force majeure
           events under Article 9.

17.3.2     Upon written request of Buyer for a Change that entails additional
           services totaling $10,000, or less, and

                                       24
<PAGE>   28

           upon written acceptance thereof by Seller, Seller will proceed in
           good faith to implement such Change prior to receipt of an executed
           Change Order. Within five (5) days following Buyer's written request,
           the parties shall agree upon an appropriate price for such Changes,
           all of which will be summarized in a subsequent Change Order and
           executed by an authorized representative of Buyer within fifteen (15)
           days following the date of the request for Change.

17.4       Calculations for any Equipment reconfigurations prior to the Ship
           Date shall be based on Prices set forth in Annex 1, provided that (i)
           any additions shall include any necessary engineering, Installation
           and testing charges and (ii) any deletions shall include applicable
           discounts, and further provided that the net cumulative amount of
           Changes shall not reduce the Price of a Purchase Order by more than
           ten percent (10%).

17.5       Except for the Initial System Purchase Order described in Article 5,
           Buyer may elect to cancel, upon prior written notification to Seller,
           subsequent Purchase Orders prior to shipment of Equipment subject to
           the following:

17.5.1     Without charge, Buyer may cancel any such subsequent Purchase Order
           no later than ninety (90) days prior to the earliest scheduled Ship
           Date; or

17.5.2     If Buyer cancels any subsequent Purchase Order less than ninety (90)
           days prior to the earliest scheduled Ship Date, Buyer shall pay a
           cancellation charge of ten percent (10%) of the Price to Seller; or

17.5.3     If Buyer cancels any subsequent Purchase Order less than sixty (60)
           days prior to the earliest scheduled Ship Date, Buyer shall pay to
           Seller a cancellation charge of fifteen percent (15%) of the Price;
           or

17.5.4     If Buyer cancels any subsequent Purchase Order less than thirty (30)
           days prior to the earliest scheduled Ship Date, Buyer shall pay to
           Seller a cancellation charge of twenty percent (20%) of the Price.

17.5.5     Buyer may not cancel a Purchase Order subsequent to the Ship Date.

                                       25
<PAGE>   29

17.5.6     The payment of such charges as are described in this Section 17.5
           shall be Seller's sole remedy and Buyer's sole obligation for such
           canceled Purchase Order(s).

18.        CONDITION OF INSTALLATION SITE(S)

           Based on reasonable due diligence, Buyer warrants that, to the best
           of its knowledge, all Installation Site(s) are free from friable
           asbestos or other hazardous materials or contamination. In the event
           that such contamination is found to be present at the Installation
           Site, Seller shall be relieved of all of its delivery and
           Installation obligations hereunder until such contamination is
           removed. Delivery of any Equipment affected by such contamination
           shall be managed in accordance with and subject to Article 7. In the
           event that Buyer fails or refuses to remove such contamination,
           Seller shall have the right to remove the Equipment or portions
           thereof if already delivered and relocate the Equipment to an
           alternate site provided by Buyer and charge Buyer for (i) any
           additional delivery charges to the new Installation Site, (ii) all
           materials expended at the site including cabling, permanently affixed
           equipment, and those items which cannot reasonably be removed for use
           elsewhere, (iii) specifically ordered items requested by Buyer, and
           (iv) all labor and materials expended at the sites relating to the
           relocation using Seller's then current rates.

19.        RELEASE OF INFORMATION

19.1       Unless required by law, or as otherwise permitted under this
           Agreement, Buyer and Seller agree that the terms and conditions of
           this Agreement shall not be disclosed to any other party without the
           prior written consent of the other; provided, however, that Seller
           may release information to (i) Northern Telecom Ltd., its research
           and development affiliates or any majority-owned subsidiaries of such
           companies on a need-to-know basis and/or (ii) a subcontractor or
           potential subcontractor of Seller for purposes of performance of this
           Agreement.

19.2       Neither Buyer nor Seller shall publish or use any advertising, sales
           promotion, press releases or publicity matters relating to this
           Agreement without the prior written approval of the other.

                                       26
<PAGE>   30

20.        CONFIDENTIALITY

           Buyer, Seller and Seller's affiliates shall receive in confidence
           from each other all technical information, business information,
           documentation and expertise which is either (i) stamped or otherwise
           marked as being confidential or proprietary whether in written or
           electronic form, or (ii) if delivered in oral form, is summarized in
           a written memorandum within ten (10) days thereafter and listed as
           being confidential ("Confidential Information") and shall not, except
           as previously authorized in writing by the other party, publish,
           disclose or make use of such information (except as required by law
           and after notice to the other party), unless and until the
           Confidential Information shall have ceased to be proprietary as
           evidenced by general public knowledge or shall have been legally
           acquired by such party; provided, however, that either party may
           provide such Confidential Information, or portions thereof, to Sprint
           Spectrum as may be necessary in connection with the build out of the
           Nationwide Network or the performance of the activities contemplated
           by this Agreement. This prohibition against disclosure, publication
           or use of Confidential Information shall not restrict either party
           from developing similar information in the exercise of its own
           technical skill, so long as such other information is independently
           developed by such party without making use of Confidential
           Information.

21.        INTERCONNECTION

21.1       Buyer is given the option to purchase individual units of Equipment
           hereunder, and Buyer understands that such units of Equipment
           purchased hereunder do not necessarily provide Buyer with a complete
           System. In some cases, Buyer may intend to interconnect the Equipment
           to equipment and facilities for interconnection which may not have
           been purchased under this Agreement. In the event that Buyer
           interconnects Equipment to equipment not purchased under this
           Agreement, it is understood and agreed that the making and
           maintaining of all necessary arrangements (whether commercial, legal
           or otherwise) with the supplier of such equipment, including not only
           arrangements necessary to permit the timely performance by Seller of
           its responsibilities under this Agreement, (e.g., physical and remote
           dial-up access for installation and services purposes), but also any
           arrangements necessary for the ongoing operation of the equipment in
           conjunction with the Equipment, shall be solely the responsibility of
           Buyer, and failure by Buyer to timely make or maintain any necessary
           arrangements shall not excuse Buyer from its obligations under this
           Agreement. However, at Buyer's request and expense, Seller agrees to
           assist Buyer in determining the cause of any problems,

                                       27
<PAGE>   31

           defects or failures associated with the Equipment and isolate and
           correct any such problem, defect or failure (even if such problem,
           defect or failure is caused by the equipment of another vendor) as
           promptly as practicable; provided, however, that Seller shall not be
           required to repair or modify any such equipment unless Seller has the
           ability, necessary resources and authorization from Buyer and such
           other vendor to do so. Notwithstanding the preceding, Seller makes no
           warranty, and shall have no responsibility whatsoever under this
           Agreement, for the proper performance of equipment not purchased
           hereunder, or for any failures of equipment not purchased hereunder
           resulting from improper performance of the Equipment.

21.2       Buyer further acknowledges that Seller makes no warranty or
           representations that the System or individual units of Equipment will
           operate in conjunction with other vendor equipment. If Buyer wishes
           Seller to conduct compatibility testing between Seller's Equipment
           and other equipment not purchased from Seller, Buyer and Seller shall
           reach agreement on the scope of such testing and charges associated
           therewith.

22.        ANNEXES

           The following Annexes shall form an integral part of this Agreement
           as though written out in full in this Agreement:

                  Annex 1        -    Equipment and Services Pricing
                  Annex 2        -    Services
                  Annex 3        -    Turnover and Acceptance Notices
                  Annex 4        -    Seller Warranty Services
                  Annex 5        -    Software License
                  Annex 6        -    Documentation
                  Annex 7        -    Adjunct Platforms

                                       28
<PAGE>   32

23.        GENERAL

23.1       Buyer may assign or transfer this Agreement or any rights hereunder
           to any other party only with the prior written consent of Seller,
           which consent shall not be unreasonably withheld or delayed. No
           assignment or sublicense of or under this Agreement, or of any rights
           under this Agreement, by Buyer shall relieve Buyer of primary
           responsibility for performance of Buyer's obligations under this
           Agreement. Seller reserves the right to refuse to honor any
           assignment or sublicense which, in the opinion of its legal counsel,
           would require Seller to violate any United States export restriction,
           other law, or regulation. Seller reserves the right to subcontract
           any portion of its obligation under this Agreement, but no such
           subcontract shall relieve Seller of primary responsibility for
           performance of Seller's obligations under this Agreement.

23.2       Notices and other communications shall be transmitted in writing by
           Certified U.S. Mail, postage prepaid, return receipt requested,
           addressed to the parties as follows:

           Northern Telecom Inc.
           2435 N. Central Expressway
           Richardson, Texas  75080
           Attention:  Director, Contracts
                  cc:  Program Manager

           Alamosa PCS LLC
           4727 South Loop 289
           Lubbock, Texas 79424
           Attention:  David Sharbutt, Chairman
                  cc:  Don Stull, Chief Technical Officer

           Any notice given pursuant to this Section 23.2 shall be effective
           five (5) days after the day it is mailed or upon receipt as evidenced
           by the U.S. Postal Service return receipt card, whichever is earlier.

23.3       This Agreement may not be modified or amended or any rights of a
           party to it waived except in a writing signed by duly authorized
           representatives of the parties hereto.

23.4       Failure by either party at any time to require performance by the
           other party or to claim a breach of any provision of this Agreement
           shall not be construed as affecting any subsequent breach or the
           right to require performance with respect thereto or to claim a
           breach with respect thereto.

                                       29
<PAGE>   33

23.5       Each party shall be liable for direct losses incurred by the other
           party due to bodily injury or damage to tangible property, including
           the Hardware, which results from the negligence of that party's
           employees or agents, provided, however, that nothing in this Section
           shall affect or in any way increase Seller's obligation under this
           Agreement with respect to the performance of the Hardware and/or
           Software. Except for bodily injury, death, or damage to tangible
           property, the total liability of Seller for all claims of any kind
           for any loss or damage, whether in contract, warranty, tort
           (including negligence), strict liability or otherwise, or claims for
           indemnification arising out of, connected with, or resulting from the
           performance or non-performance of this Agreement shall in no case
           exceed the total Price of the Purchase Order accepted under this
           Agreement giving rise to the claim.

23.6       The rights and obligations of the parties and all interpretations and
           performance of this Agreement shall be governed in all respects by
           the laws of the State of Texas except for its rules with respect to
           the conflict of laws.

23.7       Article headings are inserted for convenience only and shall not be
           used in any way to construe the terms of this Agreement.

23.8       The invalidity in whole or in part, of any provision of this
           Agreement shall not affect the validity of the remainder of such
           provision of this Agreement.

23.9       This Agreement may be executed in multiple counterparts, each of
           which shall be deemed an original and all of which taken together
           shall constitute one and the same instrument.

23.10      Each party hereto represents and warrants that (i) it has obtained
           all necessary approvals, consents and authorizations of third parties
           and governmental authorities to enter into this Agreement and to
           perform and carry out its obligations hereunder; (ii) the persons
           executing this agreement on its behalf have express authority to do
           so, and, in so doing, to bind the party thereto; (iii) the execution,
           delivery, and performance of this Agreement does not violate any
           provision of any bylaw, charter, regulation, or any other governing
           authority of the party; and (iv) the execution, delivery and
           performance of this Agreement has been duly authorized by all
           necessary partnership or corporate action and this Agreement is a
           valid and

                                       30
<PAGE>   34

           binding obligation of such party, enforceable in accordance with its
           terms.

23.11      This Agreement constitutes the entire agreement between Seller and
           the Buyer with respect to the subject matter hereof and supersedes
           all previous negotiations, proposals, commitments, writings,
           advertisements, publications and understandings of any nature
           whatsoever. No agent, employee or representative of Seller has any
           authority to bind Seller to any affirmation, representation, or
           warranty concerning the System, except as stated in this Agreement
           and unless such affirmation, representation, or warranty is
           specifically included within this Agreement, it shall not be
           enforceable by Buyer or any assignee or sublicensee of Buyer. Buyer
           and Seller hereby acknowledge and agree that they have not relied on
           any representations or warranties other than those expressly set
           forth in this Agreement.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
by their representatives being thereunto duly authorized.

ALAMOSA PCS LLC                             NORTHERN TELECOM INC.

By:  /s/ David Sharbutt                     By:  /s/ Nancy J. White
     -------------------------------             -------------------------------
Name:  David Sharbutt                       Name:  Nancy J. White
     -------------------------------             -------------------------------
                (Type/Print)                               (Type/Print)

Title:  Chairman                            Title:  VP and GM- Wireless Networks
     -------------------------------             -------------------------------

Date:  Dec. 12, 1998                        Date:  December 21, 1998
     -------------------------------             -------------------------------

                                       31<PAGE>   1
                                                                    EXHIBIT 10.2

                                 AMENDMENT NO. 1
                                       TO
                        DMS-MTX CELLULAR SUPPLY AGREEMENT
                                     BETWEEN
                                ALAMOSA PCS, LLC
                                       AND
                              NORTHERN TELECOM INC.

This Amendment No. 1 is made effective as of the 12th day of January 1999, by
and between Northern Telecom Inc. ("Seller") and Alamosa PCS, LLC ("Buyer").

WHEREAS, Buyer and Seller entered into a Supply Agreement dated December 21,
1998 for the sale and purchase of Seller's Equipment and Services ("Agreement");
and,

WHEREAS, Buyer and Seller now desire to amend the Agreement to provide for,
among other things, an initial shipment by Seller to Buyer's El Paso, Laredo,
and Albuquerque Cell Sites.

NOW, THEREFORE, in consideration of the mutual covenants herein contained, Buyer
and Seller hereby agree to amend the Agreement as follows:

1.       Delete the first sentence of Section 6.3 and replace it with the
         following:

         "Buyer shall pay all amounts invoiced by Seller pursuant to this
         Article 6 within thirty (30) days from the date of Seller's invoice
         therefor, except that for the "Initial Shipment Equipment", as set
         forth in Annex 1A, attached hereto and incorporated herein, Buyer shall
         pay all amounts invoiced by Seller for such Equipment on or before the
         earlier of: (i) thirty (30) days from the date of Seller's invoice
         therefor; or, (ii) the date of the

                                       1
<PAGE>   2

         occurrence of any Insolvency Event, as defined in the financing
         agreement between Buyer and Seller."

2.       Delete the first sentence of Section 7.2 and replace it with the
         following:

         "Title to Equipment furnished by Seller to Buyer in accordance with
         this Agreement shall pass to Buyer at the point and on the date of
         shipment, except that Seller shall retain title to the Initial Shipment
         Equipment until the purchase price therefor shall have been paid by
         Buyer in full."

3.       Add a new Annex 1A (INITIAL SHIPMENT EQUIPMENT), as included in
         Schedule "A" attached hereto and incorporated herein, and adjust the
         Table of Contents and Article 22, Annexes, of the Agreement
         accordingly.

IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 1 to be
executed by their representatives being thereunto duly authorized.

ALAMOSA PCS, LLC                          NORTHERN TELECOM INC.

By:  /s/ David Sharbutt                   By:  /s/ Nancy J. White
     ------------------------                  -------------------------------
Name:  David Sharbutt                     Name:  Nancy J. White
      -----------------------                   ------------------------------
        (Type/Print)                            (Type/Print)

Title:  Chairman                          Title:  VP and GM- Wireless Networks
       -----------------------                   -----------------------------

Date:  Feb. 12, 1999                      Date:  3-8-99
       -----------------------                   -----------------------------

                                       2

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