Document:

<PAGE>

[****] IMPORTANT NOTE: Certain material, indicated by four asterisks ("****"),
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.
                                                                   EXHIBIT 10.21
                                                                   -------------

                                AMENDMENT NO. 1
                                       TO
                1900 CDMA ADDITIONAL AFFILIATE SUPPLY AGREEMENT
                                    BETWEEN
                               ILLINOIS PCS, LLC
                                      AND
                              NORTEL NETWORKS INC.

This Amendment is made effective as of the last date signed (the "Amendment
Effective Date"), by and between Illinois PCS, LLC, an Illinois corporation with
offices located at 121 West First Street, Suite 200, Geneseo, Illinois 61254
(hereinafter referred to as "Buyer") and Nortel Networks Inc., a Delaware
corporation with offices at 2350 Lakeside Blvd., Richardson, Texas 75082
(hereinafter referred to as "Seller").

WHEREAS, Buyer and Seller entered into a Sprint Additional Affiliate Supply
Agreement on May 24, 1999 ("Agreement"); and,

WHEREAS, Buyer and Seller wish to amend the Agreement, among other things, to
increase Buyer's purchase commitment and to recognize the planned addition of
(i) the successor in interest to Buyer, iPCS Wireless, Inc. a Delaware
corporation (hereinafter referred to as "iPCS Wireless", which corporation is
intended to be the survivor by merger of Buyer with and into that corporation)
and its affiliated entity, iPCS Equipment, Inc., a Delaware corporation,
(hereinafter referred to as "iPCS Equipment") as additional parties that may
order Equipment and/or Services pursuant to the Agreement as amended hereby; and

WHEREAS, Buyer and Seller wish to amend the Agreement to add a new Section
23.13, to read as provided at Section 6 of this Amendment;
<PAGE>

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

1.   The parties agree to modify Subsection 1.45 so that Subsection reads as
     follows:

     "1.45  "Term" shall mean the period commencing on the Effective Date and
            ending July 11, 2003, unless terminated earlier in accordance with
            the terms and conditions hereof, or unless extended by the mutual
            agreement of the parties hereto."

2.   The parties agree to increase Buyer's Volume Commitment by amending
     Subsection 5.1.2, deleting the reference to "thirty-two million dollars
     ($32,000,000)" and replacing it with "sixty million dollars ($60,000,000),"
     and hereby confirm that the net amount of all purchases made by Buyer under
     this Agreement to the Amendment Effective Date in the approximate amount of
     $24,700,000.00 (twenty four million, seven hundred thousand dollars) shall
     be credited in full towards this revised Volume Commitment requirement.

3.   The parties agree to modify Subsection 5.1.3 so that Subsection reads as
     follows:

     "5.1.3  The Price for any Equipment and Services purchased under this
             Agreement prior to April 1, 2000 and financed by Seller shall
             include an additional **** percent (****%) ("Financing Premium")
             over Additional Affiliate pricing as set forth in Annex 1. From and
             after April 1, 2000 the Financing Premium shall no longer
             apply."

4.   The parties agree to amend Annex 1 by adding a new Article 5.0 (BUYER'S
     PURCHASE PRIORITY) as follows:

[****] CERTAIN PORTIONS INDICATED BY "****" HAVE BEEN OMITTED PURSUANT TO A
       REQUEST FOR CONFIDENTIAL TREATMENT AND FILED SEPARATELY WITH THE
       COMMISSION.

                                       2
<PAGE>

"5.0  BUYER'S PURCHASE PRIORITY

      The provisions of this Amendment No. 1 and the obligations of the parties
      hereunder are contingent upon the occurrence of the Effective Date under
      the Amended and Restated Credit Agreement among Buyer, iPCS, Inc., a
      Delaware corporation, iPCS Wireless and iPCS Equipment, certain lenders,
      GE Capital Corporation as Syndication Agent and Toronto Dominion (Texas),
      Inc. as Administrative Agent. In the event the Effective Date of the
      Amended and Restated Credit Agreement referenced above has not occurred
      within sixty (60) days of the execution of this Amendment No. 1, then, and
      unless the parties otherwise agree in writing, this Amendment No. 1 shall
      automatically become null and void.

5.1   Simultaneously with the execution of this Amendment, and subject to the
      provisions set out below, Buyer shall issue a Purchase Order for Equipment
      in the minimum net Price amount (i.e., Price including all applicable
      discounts, but exclusive of sales taxes) of Eighteen Million Eight Hundred
      Ninety Four Thousand Nine Hundred Eighty Dollars ($18,894,980), and take
      delivery of such Equipment on or before October 8, 2000. Notwithstanding
      the execution of the Purchase Order, in the event Buyer is unable to
      obtain full funding as called for in its business plan, and informs Seller
      of such, the amount of $18,894,980 shall be reduced by the amount of
      $13,612,957 so that Buyer shall be obligated under this Purchase Order
      only to purchase Equipment in the minimum net Price amount of $5,282,023.

5.2   In recognition of Seller's pricing initiatives to Buyer, Buyer confirms
      its intent to recognize Seller as its supplier of choice for the Term of
      this Agreement in Buyer's continuing development of the Illinois, Iowa and
      Nebraska markets."

5.    From and after the effectiveness of this Amendment and the effectiveness
      of the merger of Buyer with and into iPCS Wireless, the term "Buyer" as
      used in the Agreement as amended hereby shall mean and include iPCS
      Wireless and iPCS

                                       3
<PAGE>

      Equipment, and both iPCS Wireless and iPCS Equipment shall have full
      rights to purchase under the Agreement as amended hereby with all such
      purchases to be credited towards the Volume Commitment. With respect to
      all matters pertaining to individual Purchase Orders, and the Equipment
      and/or Services purchased or licensed pursuant to such Purchase Orders by
      iPCS Wireless and iPCS Equipment, the term "Buyer," as used herein, shall
      refer solely to whichever entity is the applicable ordering entity, and
      only the ordering entity and Seller shall have any rights and obligations
      under such Purchase Order(s), except as provided in Section 6, below.

6.    The parties agree to add a new Section 23.13, as follows:

      23.13  Seller understands that Equipment and Services ordered by iPCS
      Equipment pursuant to this Agreement shall be purchased and licensed for
      transfer solely to iPCS Wireless for its internal use and not for resale.
      Pursuant to Section 23.1 of the Agreement, with respect to Purchase Orders
      issued by iPCS Equipment, Seller hereby consents to iPCS Equipment's
      assignment of the software license granted by Seller for the applicable
      Software, solely to iPCS Wireless in conjunction with the transfer of the
      associated Hardware, and to iPCS Equipment's assignment of its rights and
      delegation of its duties under such Purchase Orders solely to iPCS
      Wireless, with the exception of payment of the Price, such Price and
      payment thereof remaining the responsibility of iPCS Equipment to Seller.
      Upon such assignments, Seller shall deal with iPCS Wireless as if it were
      the original purchaser, except for Price. The parties agree that Seller
      shall in no event be required to respond to or deal with both iPCS
      Wireless and iPCS Equipment regarding any Purchase Order or item of
      Equipment.

7.    Except as specifically modified by this Amendment, the Agreement in all
      other respects shall continue in full force and effect.

                                       4
<PAGE>

IN WITNESS WHEREOF, the parties have caused this Amendment No. 1 to be signed by
their duly authorized representatives and effective as of the date first set
forth above.

ILLINOIS PCS, L.L.C.                      NORTEL NETWORKS INC.

By: /s/ Timothy M. Yager                  By: /s/ Cynthia C. Hemme
   ------------------------------------      -----------------------------------

Name: Timothy M. Yager                    Name: Cynthia C. Hemme
     ----------------------------------        ---------------------------------
               (Type/Print)                               (Type/Print)

Title: President and Chief                Title: Vice President and General
       Executive Officer                         Counsel Contracts, Service
      ---------------------------------          Provider Solutions - Americas
                                                --------------------------------

Date: July 11, 2000                       Date: July 11, 2000
      ---------------------------------        ---------------------------------

ACKNOWLEDGED AND AGREED:

iPCS WIRELESS, INC.                       iPCS EQUIPMENT, INC.

By: /s/ Timothy M. Yager                  By: /s/ Timothy M. Yager
   ------------------------------------      -----------------------------------

Name: Timothy M. Yager                    Name: Timothy M. Yager
     ----------------------------------        ---------------------------------
               (Type/Print)                              (Type/Print)

Title: President and Chief                Title: President and Chief
       Executive Officer                         Executive Officer
                                                --------------------------------

Date: July 11, 2000                       Date: July 11, 2000
     ----------------------------------        ---------------------------------

                                       5<PAGE>

     [****] IMPORTANT NOTE: Certain material, indicated by four asterisks
("****"), 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.

                                 CONSTRUCTION
                       AND OVERSIGHT SERVICES AGREEMENT
                       --------------------------------

     THIS Agreement is executed as of the 1st day of September, 2000 between
iPCS Wireless, Inc., a Delaware corporation ("IPCS") and SDS Wireless, Inc., a
Texas corporation qualified to do business in the State of Michigan ("SDS").

     WHEREAS, IPCS has obtained the right to construct and operate a PCS network
in certain areas pursuant to an agreement titled "Sprint PCS Management
Agreement dated January 22, 1999 between WirelessCo, L.P., Sprint Spectrum L.P.
and Illinois PCS, L.L.C." and Addenda thereto (the "Sprint Agreement"). IPCS has
need for a firm to provide certain construction and oversight services described
herein for the development of approximately 120 wireless communications sites of
a PCS communications network in the geographic area in the State of Michigan in
the Basic Trading Areas ("BTAs") as set out on attached Exhibit A (the
                                                        ---------
"Project"); and

     WHEREAS, SDS has a full understanding of the scope of services required to
properly complete the Project, and represents that it has the knowledge and
experience necessary to provide such services and all other services detailed
herein; and the parties wish to set out their Agreement in writing.

     NOW, THEREFORE, in consideration of the foregoing and of the covenants
contained herein, the parties agree as follows:

1.  Term.  The term of this Agreement shall commence upon its full execution and
    -----
shall continue until the Project is complete, unless sooner terminated as
provided herein.

2.  SDS Responsibilities.
    ---------------------

  2.1   Scope of Services. The services proposed by SDS to complete the Project
        ------------------
and for which SDS will be responsible under this Agreement are set forth on
attached Exhibit B, except to the extent any of the provisions thereof are
         ---------
superseded by the terms of this Agreement (the "Services"). The parties
acknowledge that all of the services set out on Exhibit B shall be performed
                                                ---------
directly by SDS except to the extent such services are (i) performed by a third
party listed on SDS' subcontractor list attached hereto as Exhibit C, or (ii)
                                                           ---------
hereafter agreed in writing by SDS and IPCS to be performed by a third party not
listed on Exhibit C. All such Services shall be performed on a timely basis to
          ---------
accomplish the completion of the build out of the system in accordance with the
Build Out Plan set out as attached Exhibit D, and shall meet or exceed the
                                   ---------
Sprint PCS Technical Program Requirements set out as Exhibit 7.2 to the Sprint
Agreement and attached hereto as Exhibit E. SDS warrants that it has copies of,
                                 ---------
has reviewed and is fully familiar with each of the "standard documents"
referenced therein to the extent relevant to the performance of the Services
hereunder.

  2.2   Qualified third Party. SDS shall assure that any third party engaged to
        ----------------------
perform any of the activities set out on attached Exhibit B is properly
                                                  ---------
qualified and has adequate experience to properly

<PAGE>

complete such activity. All contracts with any third party shall be entered
between SDS and such third party directly, unless IPCS shall agree to become a
party thereto. IPCS shall be a third party beneficiary to any such agreement.
SDS will coordinate all activities of any such third party to assure proper and
timely completion of such activities to allow SDS to fulfill all of its
obligations and time commitments under this Agreement.

  2.3  Necessary Supplies. Except as otherwise to be provided by IPCS (e.g.,
       -------------------
IPCS' BTS equipment) or a third party as specified on Exhibit C, SDS shall
                                                      ---------
provide any and all services, materials, equipment, machinery, tools, labor,
utilities and any other items necessary (all herein "Supplies") for the
completion of its responsibilities under this Agreement.  All such Supplies
shall be procured and paid for by SDS and such Supplies shall be for the benefit
of IPCS, other than those Supplies that are intended to be solely SDS' property.
SDS shall be responsible for the handling and storage of all such Supplies.

  2.4  Taxes. Except for applicable sales tax and except as otherwise specified
       ------
on Exhibit B, SDS shall be responsible for any and all taxes, fees or levies
   ---------
incurred with regard to the Services.

  2.5  Best Efforts and IPCS Direction. SDS agrees to use all best efforts to
       --------------------------------
provide the Services and complete portions of the Project within the timeframes
set out in Exhibit D attached hereto. SDS further agrees that it shall
           ---------
coordinate all such activity through the representative or representatives of
IPCS as designated by IPCS from time to time and shall coordinate and work with
Sprint Spectrum L.P. and with any other contractor or service provider engaged
by IPCS with which coordination is required to allow full compliance by IPCS
with the Sprint Agreement. In the event SDS does not meet the "Network Ready
Date" (NRD) for any tower site, as specified for that tower on Exhibit D, the
                                                               ---------
parties agree that, in addition to any other remedies IPCS may have, IPCS shall
be entitled to retain the amount of the Project/Construction Management Fee for
that site in the amount of $ ****. The parties further agree that this penalty
shall apply in the event that Trinity Wireless Towers, Inc. a Texas corporation
and an affiliate of SDS ("TWT"), shall fail to meet the NRD for its services and
with respect to the sites as set out in the Build-to-Suit Agreement between IPCS
and TWT dated September 1, 2000. The Network Ready Date (NRD) shall be extended
by reason of an event of Force Majeure, as described in Section 13.1 hereof, but
only for the time that such Force Majeure event shall continue.

  2.6  Complete Services. The parties acknowledge that it is their mutual intent
       ------------------
that the Services detailed on Exhibit B encompass all of the services required
                              ---------
to complete the Project.

  2.7  Need for Additional Services. SDS agrees to immediately notify IPCS in
       -----------------------------
the event it determines any additional services may be required to complete the
Project that are not otherwise specified as part of this Agreement, and the
parties agree to promptly meet to discuss the need for such services and
negotiate reasonable compensation for the timely completion thereof if required.

  2.8  Hazardous Materials. As part of the Services, SDS will track requests for
       --------------------
NEPA and phase I environmental reports. SDS agrees to notify IPCS in scheduled
progress meetings in the event a

[****] CERTAIN PORTIONS INDICATED BY "****" HAVE BEEN OMITTED PURSUANT TO A
       REQUEST FOR CONFIDENTIAL TREATMENT AND FILED SEPARATELY WITH THE
       COMMISSION.

<PAGE>

phase I environmental report suggests evidence of any hazardous material then
being on or having previously been on a site.

     2.9   Utilities. SDS will be responsible for timely coordination to provide
           ----------
electricity, water and any other utility to each site to assure there is no
delay in site development.  SDS shall establish the accounts for such utilities
in the name of IPCS and shall promptly notify IPCS of the establishment of such
accounts.

     2.10  Time is of the Essence. SDS acknowledges that time is of the essence
           -----------------------
of this Agreement, and SDS will use all best efforts to provide the Services and
coordinate the completion of the Project within the timeframe specified in this
Agreement.  Any delay by IPCS in providing material information, criteria or
approvals shall extend the time for completion by SDS by one day for each day of
delay by IPCS.  SDS shall not be liable for any additional costs or expenses
arising from or as a result of any such delay by IPCS.

     2.11  Standard of Performance. SDS warrants that the Services shall be
           ------------------------
performed in a professional and skillful manner and that all work required as
part of the Services shall be free from defects in design, material and
workmanship and shall otherwise conform with the requirements of this Agreement.
SDS further warrants that it will monitor the activities of any third parties
who perform any part of the Services to assure that they meet the standard set
forth above.

     2.12  Technical Program Requirements. SDS will provide the Services and
           -------------------------------
complete the Project in a manner to meet the Technical Program Requirements
described on attached Exhibit E.  SDS shall be responsible for all changes and
                      ---------
additional services required to assure that the system Technical Program
Requirements set out on Exhibit E are met prior to final acceptance by IPCS.
                        ---------

     2.13  Permits, etc. IPCS shall also cooperate as reasonably required by SDS
           -------------
in the process of obtaining necessary permits, licenses and inspections.

     2.14  As Built Plans. SDS agrees to provide all original or copies of
           ---------------
drawings, designs, surveys and any "as-built" drawings for each site at the time
it delivers its notice of site completion for final payment.  SDS shall at the
same time provide final lien waivers with regard to all Services performed on
that site, including that of SDS.

     2.15  Safety and Supervision Matters. SDS shall be solely responsible for
           -------------------------------
establishing and maintaining safety precautions and programs with regard to the
Services and Supplies to be provided hereunder.  SDS shall further be
responsible to assure that any third party providing any Services or Supplies
shall comply with all applicable laws, ordinances, rules, relations and any
applicable orders of public authorities.

     2.16  Certificate of Compliance.  Prior to commencing any Services
           --------------------------
hereunder, SDS shall execute and deliver to IPCS a Certificate of Compliance in
the form set forth as attached Exhibit F.  SDS shall also require any third
                               ---------
party that it engages to perform any of the Services to execute and
<PAGE>

deliver a Certificate of Compliance on the same form, shall provide the original
thereof to IPCS before any such third party commences any of the Services and
shall keep a copy thereof on file and accessible.

3.  IPCS Responsibilities.
    ----------------------

     3.1  Availability. IPCS shall make its representatives continuously
          -------------
available to SDS throughout the Project to provide input, information, guidance
and decisions on various matters promptly as such matters are brought by SDS to
the attention of IPCS.  The IPCS representatives shall be the following:

Anthony M. Muscato, Peter Hefner and Jeffrey Pinegar, and any other individual
----------------------------------------------------
designated by IPCS in writing from time to time.  The IPCS representatives shall
have full authority to act on behalf of IPCS and shall promptly review documents
and render decisions to facilitate provision of the Services by SDS.

     3.2  Cooperation. IPCS will cooperate with SDS as reasonably required to
          ------------
allow SDS to provide the Services on a timely basis.  IPCS shall also cooperate
as reasonably required by SDS in the process of obtaining necessary permits,
licenses and inspections.

     3.3  IPCS Assistance. IPCS shall provide all guidance required with
          ----------------
respect to the Technical Program Requirements set out on attached Exhibit E for
                                                                  ---------
the Project.

     3.4  Communications with Third Parties. IPCS shall direct all official
          ----------------------------------
communications with any third parties providing Services directly or indirectly
under this Agreement through SDS to keep SDS adequately informed of any such
communications.

     3.5  Access. IPCS shall provide SDS with free access to each project site
          -------
and shall know the terms of any lease or other agreement by which IPCS shall
have rights to the site.

     3.6  Notice of Non-Conformance. IPCS shall give prompt written notice to
          --------------------------
SDS of any fault or defect noted by IPCS in the Services provided by SDS or any
third party engaged by SDS.

4.   Compensation.
     -------------

     4.1  Payments. IPCS shall pay SDS the amounts set out on Exhibit B with
          ---------                                           ---------
regard to each of the Services provided by SDS upon attaining the relevant
milestones as specified therein, and subject to the hold back provisions of
paragraph 4.5.  If any service not specified on Exhibit B is later identified
                                                ---------
and is to be provided by SDS, the parties agree to negotiate reasonable
compensation for such service and to set out their agreement in writing as an
amendment to this Agreement prior to the provision of such service.

     4.2  Waiver by SDS. Acceptance by SDS of final payments shall constitute a
          --------------
waiver of all claims for payment, except for any retainage and claims previously
made in writing and identified as unresolved at the time of written notice by
SDS that final payment is due.
<PAGE>

     4.3  Payments to Third Parties. Except to the extent IPCS is to be billed
          --------------------------
directly and is obligated to make payments directly to third parties as set out
in Exhibit B, SDS will arrange to have all such invoices promptly delivered to
   ---------
IPCS in order to allow IPCS the full period to take advantage of any discount
for prompt payment and otherwise to timely pay such invoices.  SDS will promptly
pay before they are due any and all invoices for Services or Supplies that are
to be paid by SDS.

     4.4.  SDS Invoices. SDS invoices and payment requests shall be accompanied
           -------------
by a summary of the progress of work on each site for which payment is being
requested on that invoice. Each invoice submitted by SDS shall include all
detail reasonably requested and required by IPCS in order to identify the full
scope of services provided, the individual providing such services and the
timeframe involved. SDS invoices shall be payable by IPCS 30 days after IPCS
receives the invoice adequately documented as set out above, except that each
SDS invoice shall allow IPCS the right to take a two percent (2%) discount for
full payment within ten (10) days of IPCS' receipt of such invoice. Any SDS
invoice not paid within 45 days of its due date shall accrue interest at a
monthly rate equal to the lesser of (i) the maximum rate allowed by law, and
(ii) 1.5%.

     4.5  Hold Back. IPCS shall be entitled to hold back ten percent (10%) of
          ----------
each amount that SDS invoices to IPCS for construction costs to be paid,
directly or indirectly, to third parties for each site until the development of
that site is complete and the site has been accepted by IPCS.  For the purposes
of this provision, IPCS shall be deemed to have accepted a site when SDS has
provided written notice to IPCS of site completion and IPCS has not, within
seven (7) days after such written notice, provided written notice to SDS of any
Services or other responsibilities of SDS that have yet to be completed for that
site.  Notwithstanding the foregoing, IPCS acknowledges that its acceptance
shall not be conditioned upon performance of any radio equipment specified by
IPCS or any third party.

     4.6  Disputed Invoices. In the event IPCS shall dispute the amount shown
          ------------------
as due on any invoice, IPCS shall immediately notify SDS and the parties agree
to promptly review any matters in dispute and to reach a resolution on the
amount properly due.  IPCS shall pay any portions of a disputed invoice not in
question.  Any portion of an invoiced amount in dispute shall not accrue
interest until thirty (30) days after such dispute is resolved as provided under
this Agreement.

5.  Title and Risk of Loss.
    -----------------------

     5.1  Title. SDS will manage and coordinate site acquisition title work
          ------
requests ordered by IPCS' site acquisition agents and shall take all action
necessary to assure that full and clear title to all of the personal property
required for the completion of the Project is properly conveyed to IPCS on or
before the date of final acceptance of each site.  SDS will assure that good and
clear title to any personal property for which payment has been made by IPCS
shall be conveyed promptly upon payment throughout the course of the Project.

     5.2  Risk of Loss. Notwithstanding the passage of title, the risk of loss
          -------------
or damage to any personal or real property that has been or will be conveyed to
IPCS under this Agreement and that is
<PAGE>

located at a specific site or is otherwise under SDS' control shall remain with
SDS until IPCS shall take exclusive control thereof.

6.  Insurance and Bonds.
    --------------------

     6.1  Insurance. SDS shall maintain, and require each subcontractor or
          ---------
third party providing any Services or Supplies to maintain (unless otherwise
agreed to in writing in advance [which may be evidenced by electronic mail
transmission] by SDS and IPCS), in effect at all times during the performance of
any portion of this Agreement, insurance coverage of the types and in the
amounts as set forth below.  Such insurance shall be in effect prior to
commencement of any of the Services and shall be evidenced by certificates of
insurance that provide for at least 30 days of advanced written notice to IPCS
prior to cancellation, termination or alteration of the policy of insurance.
All such insurance shall be provided by companies licensed to do business in the
State of Michigan and otherwise reasonably satisfactory to IPCS.

     6.1.1  Worker's Compensation. Worker's Compensation insurance in the
            ----------------------
following minimum amounts:  employer's liability--$100,000 per each accident;
employer's liability disease--$100,000 per each employee;  employer's liability
disease--$500,000 policy limit; worker's compensation--statutory limit for each
state in which any work is being performed; or, with respect to all of the
foregoing, such higher amounts as may from time to time be required under the
law of the state in which the work is being performed.

     6.1.2  Commercial General Liability and Excess (Umbrella) Liability.
            -------------------------------------------------------------
Commercial general liability and excess (umbrella) liability in a total combined
limit for bodily injury and property damage, covering SDS with minimum limits of
$1,000,000 for each occurrence for maintenance work and minimum coverage of
$2,000,000 for each occurrence for construction work, with such coverage to be
subject to a combined single limit of $5,000,000 aggregate for each occurrence.
In the event the insurance requirements of this subparagraph are met by both
primary and excess coverage, SDS agrees the primary coverage will be in an
amount of at least $500,000.  This coverage will include Blanket Contractual,
Contractor's Protective, Products and Completed Operations including Broad Form
Property Damage, and will have no XCU exclusions.  The Completed Operations
coverage will remain in force for a period of two (2) years following final
acceptance by IPCS and shall protect against claims that may arise out of or
result from operation of the system away from any project site.

     6.1.3  Automobile Liability. Automobile liability insurance with minimum
            ---------------------
limits of $500,000 for combined single limit coverage on "any auto."

     6.1.4  Contractual Liability. Contractual liability insurance covering
            ----------------------
SDS' obligations under this Agreement, with minimum coverage limits of $250,000
for each person and $1,000,000 for each occurrence, for bodily injury; and
$250,000 for each occurrence and $1,000,000 in aggregate for property damage.
<PAGE>

     6.1.5  Builder's Risk. "All risk" builder's risk insurance endorsed for
            ---------------
each site with a limit equal to the replacement value of the total Project.

Except as otherwise noted above, all policies of insurance shall be primary
insurance.  All policies of insurance shall be noncontributing with respect to
persons or entities engaged in performance of the Services on site.  Each policy
for which such endorsement is available shall contain a "cross liability" or
"severability of interest" endorsement or clause.  IPCS shall not incur
liability to an insurance carrier for payment of premiums for these policies by
reason of its inclusion as an additional insured under any such policy.

     6.1.6. Waiver of Subrogation. SDS and IPCS hereby waive all rights against
            ----------------------
each other for damages covered by any type of insurance during and after the
completion of the Project; provided that such waiver shall not invalidate or
diminish any such coverage.

     6.1.7  Further Insurance. SDS shall also carry any additional insurance
            ------------------
that is generally carried to cover the reasonable risks of the activities SDS
will be performing under this Agreement and in such amounts as shall provide
reasonable coverage with regard to the risks involved therewith.

7.   Confidentiality.  For the purposes of this Agreement all plans, design
     ----------------
criteria, information on prospective sites, financial information, drawings,
specifications and any other information related to the Project and not
generally known is defined herein as "Confidential Information."  SDS agrees
that it will maintain the confidentiality of all Confidential Information and
will distribute such information only to those individuals with the need to know
the same in order to provide the Services under this Agreement.  Such
Confidential Information, whether developed by IPCS, SDS or any third party
pursuant to this Agreement shall be and remain the property of IPCS.  SDS agrees
not to use or disclose any such Confidential Information, directly or
indirectly, during the term of this Agreement or at any time thereafter.  SDS
further agrees to require that any third party that shall provide any portion of
the Services under this Agreement to agree in writing in advance to be bound to
the provisions of this paragraph in the event such third party is presented with
Confidential Information.

8.   Dispute Resolution.
     -------------------

     8.1  Arbitration. Any dispute under this Agreement shall be resolved in
          ------------
accordance with the Commercial Arbitration Rules of the American Arbitration
Association (the "Rules") then in effect and shall be decided by three (3)
arbitrators selected in accordance with the Rules.  The arbitrators shall meet
in Chicago, Illinois and shall render a decision of the majority of them in
writing stating the amount, if any, one party hereto is obligated to pay to the
other.  The decision of the arbitrators shall be rendered as soon as practical
following commencement of the arbitration proceeding.  The arbitrators shall
deliver their written decision to both parties and a judgement may be entered on
that decision in any court of competent jurisdiction, and enforcement may be had
thereon.  Any service of process required in connection with such arbitration
may be made by personal delivery or by registered or certified mail, return
receipt requested, addressed to each party as provided herein.  All fees, costs
and expenses of the prevailing party, including reasonable attorney's fees,
shall be awarded and paid as
<PAGE>

determined by the arbitrators. Each party consents to the jurisdiction of the
arbitrators and this provision shall be specifically enforceable.

     8.2   Continued Services.  Unless otherwise agreed in writing, SDS agrees
           -------------------
to continue providing the Services and to maintain satisfactory progress during
any period of arbitration proceedings, and IPCS shall continue to make payments
to SDS as otherwise provided under this Agreement with regard to any matter not
the subject of such arbitration.

9.   Ownership of Documents.  Unless otherwise agreed in writing, all
     -----------------------
engineering documents, surveys, technical studies, environmental assessments,
drawings, specifications and other documents containing technical information or
specifications that are prepared or acquired by SDS or any third party as part
of the provision of Services under this Agreement shall be and remain the
property of IPCS.

10.  Cost Information.  SDS shall maintain its records of expenses and other
     -----------------
records relating to the provisions of Services under this Agreement in
accordance with generally accepted accounting principles consistently applied.
SDS shall maintain complete records of all activity in regard to this Agreement
throughout the term of this Agreement and for a period of four (4) years
thereafter, and shall allow any authorized representative of IPCS full access to
such records as reasonably required from time to time, upon reasonable notice
and during business hours.

11.  Indemnification.
     ----------------

     11.1  Mutual Indemnification.  Each party of this Agreement shall indemnify
           -----------------------
and hold harmless the other party together with that party's directors,
officers, agents and employees, from any and all loss, cost or expense,
including demands, judgements and attorney's fees, with regard to personal
injury, death, property damage or any other cause resulting from the acts or
omissions of a party, its agents, employees and subcontractors in connection
with this Agreement or in connection with providing Services or Supplies under
this Agreement.  The party required to indemnify hereunder shall defend any suit
or action and satisfy any judgement that may be rendered against the other
party, and further agrees to provide prompt notice of any such suit or action
and allow the party to be indemnified full opportunity to have its own counsel
involved in such defense, although the party to be indemnified shall have no
obligation to do so.  To the extent insurance proceeds are ultimately available
to pay any amount for which indemnification otherwise would be provided
hereunder, such indemnity shall be waived, provided however that such waiver
does not invalidate or otherwise defeat the availability of such insurance
proceeds or the right of subrogation of any insurer.

     11.2  Liens.  SDS shall further indemnify and hold harmless IPCS and any
           ------
property that is, or is to become, owned by IPCS under this Agreement from all
costs, fees and expenses of any nature, including attorney's fees, resulting
from any lien or encumbrance that arises with respect to such property as a
result of the provision of any of the Services or Supplies under this Agreement.
<PAGE>

     11.3  Hazardous Material Indemnity.  SDS warrants that it will not
           -----------------------------
transport, store, or otherwise make use of any hazardous material on any Project
site or with respect to services to be performed under this Agreement, and shall
indemnify and hold harmless IPCS from and against any and all claims, losses and
expenses of any nature, including attorney's fees, arising with respect to any
breach of this warranty.  The term "hazardous material" shall include any
substances or materials the presence of which on the site would create any
liability or potential liability to any owner or operator of the property for
clean-up, remediation or otherwise with regard to such material, any structure,
the soil and/or groundwater, and without regard to whether such liability arises
under federal, state or local law, ordinance, rule or regulation.

12.  Termination.
     ------------

     12.1    Termination by IPCS.  IPCS may terminate this Agreement without
             --------------------
further obligation or liability as follows:

     12.1.1  For Cause.  IPCS may terminate this Agreement immediately upon
             ----------
notice to SDS for good cause shown.  Good cause shall include, by way of example
and not limitation, any material breach of this Agreement by SDS that remains
uncured more than ten (10) days after notice thereof to SDS, or failure by SDS
to make reasonable progress towards completion of the requirements of this
Agreement, including failure of SDS and/or any third party it engages to perform
any of the Services to make continuous, timely and proportionate progress
towards completion of the Build Out Plan detailed on Exhibit D.
                                                     ---------

     12.1.2  Without Need to Show Cause.  IPCS may terminate this Agreement
             ---------------------------
without need to show cause on thirty (30) days prior notice.

     12.2    Termination by SDS.  SDS may terminate this Agreement in the event
             -------------------
that any material default by IPCS that shall remain uncured more than thirty
(30) days after notice thereof from SDS to IPCS.

     12.3    Compensation to SDS.  In the event this Agreement is terminated for
             --------------------
any reason other than cause under subparagraph 12.1.1 above, SDS shall be
entitled to appropriate compensation under this Agreement and pursuant to
Exhibit B through the effective date of such termination and for reimbursement
---------
of any proper third party expenses incurred through such date.

     12.4    Assignments.  Upon the termination of this Agreement for any
             ------------
reason, SDS shall assign and otherwise transfer and convey to IPCS, or as IPCS
shall direct, any and all rights under any agreements entered by SDS with third
parties (which shall include any entities affiliated directly or indirectly with
SDS) to provide Services or Supplies for the Project.

     12.5    Additional Expenses.  In the event this Agreement is terminated for
             --------------------
cause pursuant to subparagraph 12.1.1. above, SDS shall be responsible for any
and all additional costs and expenses, including reasonable attorney's fees,
incurred by IPCS in obtaining replacement services required for the
<PAGE>

completion of the Project, to the extent the costs thereof exceed the amounts
otherwise to have been paid to SDS hereunder.

13.  Miscellaneous Provisions.
     -------------------------

     13.1  Force Majeure.  Each party shall be excused from any performance
           --------------
required under this Agreement to the extent such performance is rendered
impossible due to an event beyond the control of such party; provided however,
that each party shall use all best efforts to minimize any delay resulting
therefrom and mitigate any losses that may result.

     13.2  Independent Contractor.  SDS is an independent contractor.  SDS shall
           -----------------------
be solely liable for all taxes of any nature, including withholding taxes, with
regard to its activities and employees.  Except has specifically provided in
this Agreement, SDS shall not have any right to bind IPCS and shall not so
represent.

     13.3  Notices.  Any notice required or permitted herein shall be in writing
           --------
and shall be personally delivered or delivered by certified mail, return receipt
requested, by recognized national overnight courier, or by facsimile with
confirmation of receipt, and shall be addressed to each party as specified
below:

IPCS                        SDS
----                        ---
iPCS Wireless, Inc.         SDS Wireless, Inc.
11 Hawkeye Lane             2201 W. Royal Lane, Ste. 210
Geneseo, IL 61254           Irving, Texas 75063
Fax: (309) 945-1785         Fax: 972-869-1215
Attn: Anthony R. Muscato    Attn: President and General Counsel

Notices so given shall be effective upon the earlier of receipt or three (3)
days after certified mailing.

     13.4  Entire Agreement.  This Agreement, together with all exhibits,
           -----------------
constitutes the entire Agreement between the parties with respect to the subject
matter hereof, and supersedes all prior or contemporaneous oral or written
agreements, all of which shall be of no force and effect except to the extent
set out herein.  The parties acknowledge that it is their intent that work in
process to date shall be governed by the terms of this Agreement.  This
Agreement may not be modified except in writing signed by both parties.  No
waiver of any breach by either party at any time shall constitute a waiver of
the same or any other breach at any subsequent time.

     13.5  Captions.  The captions used in this Agreement are for convenience
           ---------
and shall not be used to construe any of the provisions of this Agreement.

     13.6  Severability.  If any provisions of this Agreement shall be
           -------------
determined to be invalid or unenforceable, such provisions shall be deemed
severable and shall be severed to the extent of such determination, and the
remainder of the Agreement shall continue in full force and effect.
<PAGE>

     13.7   Assignment.  SDS shall not assign any of its rights or duties of
            -----------
this Agreement without the prior written consent of IPCS, which may be withheld
in the sole discretion of IPCS. Any attempt at such assignment without such
prior written consent of IPCS shall be void.

     13.8   Governing Law.  This Agreement shall be governed by and construed in
            --------------
accordance with the laws of the State of Illinois, without regard to its choice
of law provisions.

     13.9   No Strict Construction.  The language used herein represents the
            -----------------------
agreement of the parties and no rule of strict construction shall be applied
against either party.

     13.10  Survival.  Any provision of this Agreement intended for the
            ---------
protection of either party or the enforcement of rights hereunder shall survive
the termination of this Agreement.

     13.11  Authorization.  The individuals executing this Agreement warrant
            --------------
full authority to do so on behalf of the respective party.

     13.12  Counterparts.  This Agreement may be executed in counterparts, each
            -------------
of which shall be an original document, but all of which taken together shall
constitute one and the same Agreement.

     IN WITNESS WHEREOF, this Agreement has been executed on the date first set
forth above.

iPCS Wireless, Inc.                     SDS Wireless, Inc.

By: ________________________________    By: _______________________________
                                               Tracy A. Schrader
                                               Vice President
Title: _____________________________
<PAGE>

                                  Exhibit List
                                  ------------

Exhibit A - IPCS Michigan Markets
---------

Exhibit B - Services
---------

Exhibit C - List of Subcontractors
---------

Exhibit D - IPCS Build Out Plan
---------

Exhibit E - Sprint PCS Technical Program Requirements
---------

Exhibit F - Form of Compliance Certificate
---------
<PAGE>

                                   EXHIBIT A
                                   ---------

                             IPCS Michigan Markets
                             ---------------------

                           BTA#              BTA Name
                           ----              --------

                           169             Grand Rapids
                           390             Saginaw/ Bay City
                           310             Muskegon
                           241             Lansing
                           33              Battle Creek (partial)
                           307             Traverse City
                           446             Mount Pleasant
<PAGE>

                                   EXHIBIT B
                                   ---------

                                   Services
                                   --------

                                (see attached)
<PAGE>

                                 Scope of Work

                               Project Management
                               ------------------

1.   Assign RF search rings to the site acquisition companies.
2.   Weekly track and manage site acquisition firms and provide weekly project
     status reports to IPCS.
3.   Track FAA & FCC filings.
4.   Schedule and conduct construction walks with the site acquisition agents.
5.   Order and track zoning drawings.
6.   Manage Purchase Order Requests and Purchase Orders.
7.   Track leasing and zoning of sites.
8.   Provide total information technology network system support.
9.   Order and maintain office supplies.
10.  Recruit and provide support staff.
11.  Manage and coordinate site acquisition title work requests ordered by site
     acquisition agents.
12.  Order and track requests for A&E drawings.
13.  Track requests for NEPA.
14.  Order and track Phase I and Geotechnical reports.
15.  Order and track all tower drawings, structural tests and foundation
     designs.
16.  Manage documentation packages from site acquisition companies.
17.  Track interconnect and schedule and track installation of BTS equipment
     with BTS equipment vendor.

Project Management services will be billed at $**** per site, with (i) $****
becoming due and payable upon issuance of the search ring for the site; (ii)
$**** becoming due and payable upon commencement of construction
of the site; (iii) $**** becoming due and payable upon completion of
construction of the site; and (iv) $**** becoming due and payable upon
presentation to IPCS of the close-out documentation for the site.

[****] CERTAIN PORTIONS INDICATED BY "****" HAVE BEEN OMITTED PURSUANT TO A
       REQUEST FOR CONFIDENTIAL TREATMENT AND FILED SEPARATELY WITH THE
       COMMISSION.
<PAGE>

                            Construction Management

     Upon receipt of the "Documentation Package," including lease agreement
between IPCS and its landlord, excluding terms and payment, 2-C letter,
survey/site plans, geo-technical report, tower and foundation drawings (where
applicable), structural analysis (where applicable), RF final configuration
sheet, construction drawings issued for construction, FAA/FCC approval (where
applicable), written notice to proceed from IPCS and landlord contact
information, SDS will then commence to do the following:

1.   Receive building permit from IPCS or IPCS' representative(s).
     a.   Pull all permits from local governing jurisdictions to start
          construction (optional - see pricing below).
     b.   Take address from building permit and coordinate/manage power and
          telco demarcation and routing in the field.
2.   Attend weekly meetings on data tracking and project management.
3.   Prepare documentation and organize bid walk.
4.   Manage entire bid process through award of contract, to include any and all
     purchase order requests as it relates to the construction activity, upon
     approval of IPCS.
5.   Implement a schedule with detailed activities with appropriate timeframes
     for both IPCS and contractor.
6.   Manage "request for competitive pricing" process for all applicable
     materials. Manage procurement and delivery of all material. To include
     tower, tower material, shelter, antennas, coax and support hardware
     (optional - see pricing below).
7.   Coordination of pre-construction meetings with IPCS, contractor and
     landlord.
8.   Manage implementation of all civil, mechanical, electrical and tower work.
9.   Coordination of post-construction meetings with IPCS, contractor and
     landlord.
10.  Manage all of the end procurement work to include sweep tests, megger
     tests, and site binders.
11.  Coordination of site hand off to operations department at IPCS.
12.  Approval and processing of any construction invoicing.
13.  Site acceptance by IPCS or its representative(s).

Construction Management services will be billed at $**** per site, with (i)
$**** becoming due and payable upon commencement of construction of the site,
and (ii) the remaining $**** becoming due and payable upon completion of
construction of the site.

Additional services (at IPCS' request):

Pulling Permits: Cost plus $**** per site, payable net 30.
Procurement and Material Management: $**** per site, with (i) $**** becoming due
and payable upon commencement of construction of the site, and (ii) the
remaining $**** becoming due and payable upon completion of construction of the
site.
Hourly rate for "Special Projects" $**** per hour, payable net 30.

[****] CERTAIN PORTIONS INDICATED BY "****" HAVE BEEN OMITTED PURSUANT TO A
       REQUEST FOR CONFIDENTIAL TREATMENT AND FILED SEPARATELY WITH THE
       COMMISSION.
<PAGE>

                                   EXHIBIT C
                                   ---------

                             List of Subcontractors
                             ----------------------

****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****
****

[****]  CERTAIN PORTIONS INDICATED BY "****" HAVE BEEN OMITTED PURSUANT TO A
        REQUEST FOR CONFIDENTIAL TREATMENT AND FILED SEPARATELY WITH THE
        COMMISSION.
<PAGE>

BTA#           BTA Name                    NRD       Market Launch

169          Grand Rapids                10/04/00      10/18/00
390          Saginaw/Bay City            10/04/00      10/18/00
310          Muskegon                    10/04/00      10/18/00
241          Lansing                     10/04/00      10/18/00
33           Battle Creek (partial)      10/04/00      10/18/00
446          Traverse City               ****          ****
307          Mount Pleasant              ****          ****

[****]  CERTAIN PORTIONS INDICATED BY "****" HAVE BEEN OMITTED PURSUANT TO A
        REQUEST FOR CONFIDENTIAL TREATMENT AND FILED SEPARATELY WITH THE
        COMMISSION.

<PAGE>

                                   EXHIBIT E
                                   ---------

                   Sprint PCS Technical Program Requirements
                   -----------------------------------------

                                 (see attached)
<PAGE>

                                   EXHIBIT F
                                   ---------

              Certificate of Compliance with Federal Regulations

In consideration of, and as a requirement under, a contract with iPCS Wireless,
Inc., the undersigned "contractor", "vendor" or "consultant" agrees to the
following and further agrees that this Certification shall be a part of each
purchase order, supply agreement, or contract between iPCS Wireless, Inc. and
the undersigned.

1.   Equal Opportunity
     -----------------
     Executive Order 11246 is herein incorporated by reference.

2.   Affirmative Action Compliance
     -----------------------------
     If undersigned contract has 50 or more employees and if this contract is
     for $50,000 or more, Contractor shall develop a written Affirmative Action
     Compliance  Program for each of its establishments, as required by rules
     and regulations of the Secretary of Labor (41 CFR 60-1 and 60-2)

3.   Affirmative Action for Special Disabled and Vietnam Era Veterans
     ----------------------------------------------------------------
     If this contract exceeds $10,000, the undersigned Contractor certifies that
     the Contractor does not discriminate against any employee or applicant
     because the person is a special disabled or Vietnam Veteran and complies
     with the rules, regulations and relevant orders of the Secretary of Labor
     issued pursuant to the Vietnam Veterans Readjustment Assistance Act of
     1972, as amended.

     Contractor hereby represents that it has developed and has on file, at each
     establishment, affirmative action programs for Special Disabled and Vietnam
     Era Veterans required by the rules and regulations of the Secretary of
     Labor (41 CFR 60-250).

4.   Affirmative Action for Handicapped Workers
     ------------------------------------------
     If this contract exceeds $2,500, the undersigned Contractor certifies that
     the Contractor does not discriminate against any employee or applicant
     because of physical or mental handicap and complies with the rules,
     regulations and relevant orders of the Secretary of Labor issued under the
     Rehabilitation Act of 1973, as amended.

     Contractor hereby represents that it has developed and has on file, at each
     establishment, affirmative action programs for Handicapped Workers required
     by the rules and regulations of the Secretary of Labor (41 CFR 60-741).

5.   Employer Information Report  (EEO-1 Standard Form 100)
     ---------------------------
     If undersigned Contractor has 50 or more employees and if this contract is
     for $10,000 or more, Contractor shall complete and file government Standard
     Form 100, Equal Employment Opportunity Employer Information Report EEO-1,
     in accordance with instructions contained therein.
<PAGE>

6.   Compliance Review
     -----------------
     The undersigned Contractor certifies that it has not been subject to a
     Government equal opportunity compliance review.  If the Contractor has been
     reviewed, that review occurred on ________________ (date).

7.   Utilization of Small Business, Small Disadvantaged Business, and Women-
     ----------------------------------------------------------------------
     Owned Small Business
     --------------------
     It is the policy of iPCS Wireless, Inc., consistent with Federal
     Acquisition Regulations (FAR 52.219-8 and FAR 52.219-13), that small
     business concerns, small business concerns owned and controlled by socially
     and economically disadvantaged individuals, and women-owned businesses
     shall have the maximum practicable opportunity to participate in performing
     subcontracts under Government contracts for which iPCS Wireless, Inc. is
     the Government's Prime Contractor.  iPCS Wireless, Inc. awards contracts to
     small businesses to the fullest extent consistent with efficient prime
     contract performance.  The Contractor agrees to use its best efforts to
     carry out this policy in the award of its subcontract to the fullest
     consistent with the efficient performance of this contract.

     Contractor hereby represents that it ____ is ____ is not a small business,
     ____ is ____ is not a small business owned and controlled by socially and
     economically disadvantaged individuals, and ____ is ____ is not a small
     business controlled and operated as a women-owned small business as defined
     by the regulations implementing the Small Business Act.

     If the answer to any of the above is in the affirmative, Contractor further
     agrees to complete a Small/Minority/Women Owned Business Self Certification
     Form.  This form is available by contacting Mr. M. Lynn Pike at iPCS
     Wireless, Inc., 111 East First Street

     Geneseo, IL 61254, (309) 944-8001.

8.   Certification of Nonsegregated Facilities
     -----------------------------------------
     If this contact is expected to exceed $10,000, the undersigned Contractor
     certifies as follows:

     The Contractor certifies that the Contractor does not or will not maintain
     or provide for its employees any segregate facilities at any of its
     establishments, and that it does not and will not permit its employees to
     perform services at any location under its control, where segregated
     facilities are maintained. The Contractor agrees that a breach of this
     Certification is a violation of the Equal Opportunity provision of this
     contract. As used in this Certification, the term "segregated facilities"
     means any waiting rooms, work areas, rest rooms and wash rooms, restaurants
     and other eating areas, time clocks, locker rooms and other storage or
     dressing areas, parking lots, drinking fountains, recreation or
     entertainment areas, transportation, and housing facilities provided for
     employees that are segregated by explicit directive or are in fact
     segregated on the basis of race, color, religion, or national origin,
     because of habit, local custom, or otherwise. Contractor further agrees
     that (except where it has obtained identical certifications from proposed
     subcontracts for specific time periods) it will obtain identical
     certifications from proposed subcontractors prior to the award of
     subcontracts exceeding $10,000 that are not exempt from the provisions of
     the Equal Opportunity Clause; and that it will retain such certification in
     its files.
<PAGE>

9.   Clean Air and Water
     -------------------
     The undersigned Contractor certifies that any facility to be used in the
     performance of this contract ____ is ____ is not listed on the
     Environmental Protection Agency List of Violating Facilities.

     The undersigned Contractor agrees to immediately notify iPCS Wireless,
     Inc., immediately upon the receipt of any communication from the
     Administrator or a designee of the Environmental Protection Agency
     indicating that any facility that the Contractor proposes to use for the
     performance of the contract is under consideration to be listed on the EPA
     List of Violating Facilities.  iPCS Wireless, Inc. includes this
     certification and agreement pursuant to FAR 52-223-1(c) which requires
     including such paragraph (c) in every nonexempt subcontract.

                              Contractor:

                              _________________________________________
                              Company Name

                              _________________________________________
                              Address

                              _________________________________________
                              City               State       Zip

                              By:______________________________________

                              Name:____________________________________

                              Title: ____________________________________

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