Document:

<PAGE>

                                                                   EXHIBIT 10.39
                                                                   -------------

           Amended and Restated Interim Network Operating Agreement

     This Amended and Restated Interim Network Operating Agreement (the
"Agreement") is made and entered into as of March 1, 2001, by SPRINT SPECTRUM
L.P., a Delaware limited partnership ("Sprint PCS"), and iPCS Wireless, Inc., a
Delaware corporation ("iPCS") and replaces in their entirety that certain
Interim Operating Agreement  dated July 12, 2000 and those certain letter
agreements between Sprint PCS and iPCS dated October 23, 2000, February 5, 2001
and February 21, 2001.

                                   RECITALS
                                   --------

     A.   Sprint PCS and iPCS are parties to (i) a Management Agreement, dated
January 22, 1999, as amended to date (the "Management Agreement"), and (ii) an
Asset Purchase Agreement, dated as of July 12, 2000, for certain assets located
in Michigan and (iii) an Asset Purchase Agreement, dated as of January 10, 2001
for certain assets located in Iowa assets (together, the "Asset Purchase
Agreements") pursuant to which Sprint PCS has agreed to sell certain network
assets (the "Network Assets") to iPCS.

     B.   Both Sprint PCS and iPCS desire to set forth terms and conditions
regarding the maintenance and operations of the Network Assets.

                                   AGREEMENT
                                   ---------

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained in this Agreement the parties hereto agree as follows:

     1.   Provision of Services for Sprint PCS Operational Sites. From the date
of this Agreement until all sites are transferred, Sprint PCS will operate and
maintain the Sprint PCS Operational Site Assets listed on Exhibit A. Services
                                                          ---------
provided to iPCS will include all ongoing maintenance and operations activities.

     2.   Payment for Services.  iPCS agrees to take and pay for all services
provided by Sprint PCS under this Agreement relating to the Sprint PCS
Operational Sites. Beginning on the date of this Agreement and on the 15th day
of each month thereafter until this Section of this agreement terminates, iPCS
agrees to pay Sprint PCS the aggregate amounts set forth on Exhibit B attached
                                                            ---------
hereto and incorporated herein (the "Monthly Payment"). Payments for services
rendered by Sprint PCS for any partial months shall be prorated using the
following formula: (i) the Monthly Payment multiplied by (ii) the quotient of
(A) the number of days beginning with the 16th day of the month during which the
last Monthly Payment became due until the date this Agreement is terminated
divided by (B) 30.

     3.   Revenue Payments.  During the Term of this Agreement, iPCS shall be
paid from Collected Revenues and Interservice Area Fees generated in the calling
service
<PAGE>

area in which the Network Assets are located, as provided for and defined in the
Management Agreement.

     4.   Backhaul and Interconnection.

          Michigan:  iPCS will own and have in operation a switch capable of
switching traffic for the BTAs that are part of Manager's Service Area in
Michigan (the "Michigan BTAs") on or before July 1, 2001.   In addition, on or
before July 14, 2001, iPCS will disconnect all of iPCS' circuits from the Sprint
PCS Detroit 1, Detroit 2, and Lansing switches. The Sprint PCS Detroit 1,
Detroit 2, and Lansing switches are collectively the "Sprint PCS Michigan
Switches."

          For the period from the date of this Agreement until the earlier of
(a) such time as iPCS has its own switch available to handle such traffic in
Michigan or (b) July 14, 2001, iPCS will be responsible for all backhaul and
interconnection costs associated with the backhaul of all the Michigan BTA
traffic through the Sprint PCS Michigan Switches.  Also, iPCS will be
responsible for all transition costs of converting existing connections from the
Sprint PCS Michigan Switches to iPCS switches, including any charges for
hardware, leased-lines, installation, etc.

          Iowa:  iPCS will own and have in operation a switch capable of
switching traffic for the BTAs that are part of Manager's Service Area in Cedar
Rapids and Iowa City (the "Iowa BTAs") on or before September 21, 2001.   In
addition, on or before December 31, 2001, iPCS will disconnect all of iPCS'
circuits from the Sprint PCS Des Moines switch.

          For the period from the date of this Agreement until the earlier of
(a) such time as iPCS has its own switch available to handle such traffic in
Iowa or (b) December 31, 2001,  iPCS will be responsible for all backhaul and
interconnection costs associated with the backhaul of all the Iowa BTA traffic
through the Sprint PCS Des Moines switch.  Also, iPCS will be responsible for
all transition costs of converting existing connections from the Sprint PCS Des
Moines switch to iPCS switches, including any charges for hardware, leased-
lines, installation, etc.

     5.   Switching Services.

          Michigan: For utilization of the Sprint PCS Michigan Switches from the
date of this Agreement until the earlier of (a) the date on which iPCS has its
switch serving the Michigan BTAs in place and operational or (b) July 14, 2001,
iPCS will designate its Selected Services under Option 1, "Sprint PCS Provided."
From the date of this Agreement until July 14, 2001, iPCS agrees to pay Sprint
PCS a price equal to $0.022 per minute of use for iPCS' actual usage on the
Sprint PCS Michigan Switches for switching up to 82 cell sites off of all three
of the Sprint PCS Michigan Switches; if more than 82 cell sites are switched off
of the three Sprint PCS Switches, Sprint PCS may unilaterally increase the price
per minute.  If iPCS requires switching services after July 14, 2001, Sprint PCS
may unilaterally increase the price per minute.
<PAGE>

          Iowa: For utilization of the Sprint PCS Des Moines switch from the
date of this Agreement until the earlier of (a) the date on which iPCS has its
switch serving the Iowa BTAs in place and operational or (b) December 31, 2001,
iPCS will designate its Selected Services under Option 1, "Sprint PCS Provided."
From the date of this Agreement until October 31, 2001 iPCS agrees to pay Sprint
PCS a price equal to $0.023 per minute of use for iPCS' actual usage on the
Sprint PCS Des Moines switch for switching up to a maximum of 22 cell sites off
of the Sprint PCS Des Moines switch.  If iPCS requires switching services after
October 31, 2001, Sprint PCS may unilaterally increase the price per minute.

     6.   Term.  This Agreement is effective upon execution by both parties and
shall continue in effect until December 31, 2001. Portions of this agreement may
be terminated by letter agreement by the parties.

     7.   Indemnification. Breaches of this Agreement by either iPCS or Sprint
PCS will be a breach for which the non-breaching party is entitled to
indemnification in accordance with the terms and conditions and utilizing the
procedures set forth in the Management Agreement.

     8.   Entire Agreement and Binding Effect.  This Agreement and the exhibits
and schedules attached to this Agreement (which are incorporated by this
reference) and the Management Agreement, including all addenda thereto, contain
the entire agreement between the parties hereto with respect to the acquisition
of the Assets and the other transactions contemplated herein, and supersedes all
prior agreements or understandings between the parties hereto relating to the
subject matter hereof. All exhibits attached hereto are incorporated herein by
this reference.

     9.   Severability. In the event any one or more of the provisions contained
in this Agreement or any application thereof is invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions of this Agreement and any other application thereof will
not in any way be affected or impaired thereby. Paragraph headings herein or in
any exhibit hereto have no legal significance and are used solely for
convenience of reference.

     10.  Waivers and Notices. Any term or condition of this Agreement may be
waived at any time by the party entitled to the benefit thereof by a written
instrument. No delay or failure on the part of any party in exercising any
rights hereunder, and no partial or single exercise thereof, will constitute a
waiver of such rights or of any other rights hereunder. All notices, consents,
requests, instructions, approvals and other communications provided for herein
will be validly given, made or served if given, made or served in accordance
with the Management Agreement.

     11.  Counterparts. This Agreement may be executed in any number of
counterparts, each of which will constitute an original but all of such
counterparts taken together will constitute only one Agreement.

                                      -3-
<PAGE>

     12.  Governing Law.  The internal laws of the State of Missouri (without
regard to principles of conflicts of law) govern the validity of this agreement,
the construction of its terms, and the interpretation of the rights and duties
of the parties.

           [The remainder of this page is intentionally left blank.]

                                      -4-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

SPRINT PCS:                   SPRINT SPECTRUM L.P.

                              By  /s/  Thomas E. Mateer
                                  ---------------------
                                  Thomas E. Mateer
                                  Vice President Affiliations

IPCS:                         IPCS WIRELESS, INC.

                              By: /s/  Timothy M. Yager
                                  ---------------------
                                  Timothy M. Yager
                                  President and CEO

                                      -5-
<PAGE>

                                   Exhibit A

[9 operating sites listed by Cascade Number on inventory list.]

                                      -6-
<PAGE>

                                   Exhibit B
                      Monthly Operational Payment Amount

                     (Pricing Schedule per site attached)

                                      -7-<PAGE>

                                                                   EXHIBIT 10.40
                                                                   -------------

[*] 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.

                                  ADDENDUM VI
                                       TO
                        SPRINT PCS MANAGEMENT AGREEMENT

<TABLE>
<S>                     <C>                                                      <C>
Manager:                iPCS WIRELESS, INC. (f/k/a ILLINOIS PCS, L.L.C.)

Service Area BTAs:      Illinois Bloomington, IL                                 BTA# 46
                        Champaign-Urbana, IL                                     BTA# 71
                        Clinton, IA-Sterling, IL                                 BTA# 86
                        Danville, IL                                             BTA# 103
                        Davenport, IA-Moline, IL                                 BTA# 105
                        Decatur-Effingham, IL                                    BTA# 109
                        Galesburg, IL                                            BTA# 161
                        Jacksonville, IL                                         BTA# 213
                        Kankakee, IL                                             BTA# 225
                        LaSalle-Peru-Ottawa-Streator                             BTA# 243
                        Mattoon, IL                                              BTA# 286
                        Mt. Vernon-Centralia, IL                                 BTA# 308
                        Peoria, IL                                               BTA# 344
                        St. Louis, MO (Macoupin County, IL only)                 BTA# 394
                        Springfield, IL                                          BTA# 426
                        Nebraska Omaha, NE (partial)*                            BTA# 332
                        Lincoln, NE (partial)*                                   BTA# 256
                        Hastings, NE                                             BTA# 185
                        Norfolk, NE                                              BTA# 323
                        Grand Island -- Kearney, NE                              BTA# 167
                        Iowa Fort Dodge, IA                                      BTA# 150
                        Waterloo-Cedar Falls, IA                                 BTA# 462
                        Dubuque, IA                                              BTA# 118
                        Burlington, IA                                           BTA# 61
                        Ottumwa, IA                                              BTA# 337
                        Des Moines, IA (partial)*                                BTA# 111
                        Marshalltown, IA                                         BTA# 283
                        Mason City, IA                                           BTA# 285
                        Michigan Traverse City, MI                               BTA# 446
                        Saginaw-Bay City, MI                                     BTA# 390
                        Muskegon, MI                                             BTA# 310
                        Grand Rapids, MI                                         BTA# 169
                        Mount Pleasant, MI                                       BTA# 307
                        Lansing, MI (partial)*                                   BTA# 241
                        Battle Creek, MI (partial)*                              BTA# 33
                        Cedar Rapids, IA                                         BTA# 70
                        Iowa City, IA                                            BTA# 205
</TABLE>
<PAGE>

     This Addendum VI (this "Addendum"), dated as of February 28, 2001, contains
certain additional and supplemental terms and provisions of that certain Sprint
PCS Management Agreement entered into as of January 22, 1999, by the same
parties as this Addendum, which Management Agreement was further amended by that
certain Addendum I entered into as of January 22, 1999, that certain Addendum II
entered into as of August 3, 1999, that certain Amended and Restated Addendum
III entered into as of March 8, 2000 (which Amended and Restated Addendum III
replaced and superseded that certain Addendum III executed by the parties on
February 4, 2000), that certain Addendum IV entered into as of July 12, 2000 and
that certain Addendum V entered into as of December 15, 2000 (the Sprint PCS
Management Agreement, as amended to date, the "Management Agreement").

     The terms and provisions of this Addendum control, supersede and amend any
conflicting terms and provisions contained in the Management Agreement. Except
for express modifications made in this Addendum, the Management Agreement
continues in full force and effect.  Capitalized terms used and not otherwise
defined in this Addendum have the meanings ascribed to them in the Management
Agreement. Section and Exhibit references are to Sections and Exhibits of the
Management Agreement unless otherwise noted.

     The Management Agreement is modified as follows:

     1.   Revised Build-out Plan.  Exhibit 2.1 attached to this Addendum
                                   -----------
supersedes and replaces in its entirety Exhibit 2.1 attached to the Management
                                        -----------
Agreement.

     2.   Subscribers.  The parties agree that effective the date of the Initial
Closing of the Asset Purchase Agreement (Optional Service Area), Manager will
assume management responsibility for all subscribers in the two customer service
areas representing the Cedar Rapids/Iowa City area (OMACDR319 and OMAIWC319)
("Optional Service Area Subscribers").

     The handset of each Optional Service Area Subscriber who receives Sprint
PCS Products and Services using a Sprint PCS handset that is under warranty at
the time Manager assumes management responsibility for the Optional Service Area
Subscribers shall be subject to the underlying handset purchase agreements and
warranties of Sprint PCS insofar as provided for in such agreements.  After the
Closing date of the APA, the cost and risk of loss from defective handsets and
warranty exchanges for any Optional Service Area Subscriber will be borne by
Manager.

     3.   Counterparts.  This Addendum may be signed in counterparts, each of
which will be deemed an original, but all of which together will constitute one
and the same instrument.
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Addendum to be
executed by their respective authorized officers as of the date and year first
above written.

                                Sprint Spectrum L.P.

                                By:  /s/ Thomas E. Mateer
                                   ---------------------------------
                                Thomas E. Mateer
                                Vice President - Affiliations

                                WirelessCo, L.P.

                                By:  /s/ Thomas E. Mateer
                                   --------------------------------
                                Thomas E. Mateer
                                Vice President - Affiliations

                                SprintCom, Inc.

                                By:  /s/ Thomas E. Mateer
                                   --------------------------------
                                Thomas E. Mateer
                                Vice President - Affiliations

                                Sprint Communications Company L.P.

                                By:  /s/ Ed Mattix
                                   --------------------------------
                                Ed Mattix
                                Senior Vice President - Public Affairs

                                iPCS Wireless, Inc.

                                By:  /s/ Timothy M. Yager
                                   ---------------------------------
                                Timothy M. Yager
                                President and CEO
<PAGE>

                       Amended and Restated Exhibit 2.1
                               February 28, 2001

To be Hard Launched by December 1999

BTA 46 Bloomington
Coverage includes the cities of Bloomington, Lincoln, and Pontiac.  I-55
coverage from Springfield BTA to Chicago BTA.

BTA 86 Clinton-Sterling
Coverage includes city of Sterling.  I-88 coverage from Davenport-Moline BTA to
Chicago BTA.

BTA 105 Davenport-Moline
Coverage of "Quad Cities" metro area.  I-80 coverage from Cedar Rapids BTA to
LaSalle-Peru BTA.

BTA 161 Galesburg
Coverage of Galesburg.  I-74 from Davenport-Moline BTA to Peoria BTA.

BTA 213 Jacksonville
Coverage of Jacksonville.  I-72 from Jacksonville to Springfield BTA.

BTA 243 LaSalle-Peru-Ottowa-Streator
Coverage of LaSalle-Peru-Ottowa, and Mendota.  I-80 from Davenport-Moline BTA to
Chicago BTA and Hwy 39 from Chicago BTA to Peoria BTA.

BTA 344 Peoria
Coverage of Peoria and Pekin.  I-74 from Galesburg BTA to Bloomington BTA and I-
155 from Peoria to Bloomington BTA.

BTA 394 St. Louis (Macoupin County only)
Coverage of southern third to Macoupin County.  I-55 from border of Macoupin
county and St. Louis BTA to Springfield BTA.

BTA 426 Springfield
Coverage of Springfield, Chatham, and Litchfield.  I-55 from St. Louis BTA to
Bloomington BTA and I-72 from Jacksonville BTA to Decatur-Effingham BTA.

To be Hard Launched by December 2000

BTA 46 Bloomington
Coverage of city of Clinton.  Hwy 51 from Bloomington to Decatur BTA and I-74
from Bloomington to Champaign-Urbana BTA.

BTA 71 Champaign-Urbana
Coverage of Champaign and Urbana.  I-74 from Bloomington BTA to Danville BTA, I-
72 from Decatur-Effingham BTA to Champaign, and I-57 from Kankakee BTA to
Mattoon BTA.

BTA 103 Danville
Coverage of city of Danville.  I-74 from Champaign-Urbana BTA to Lafayette BTA.
<PAGE>

BTA 109 Decatur-Effingham
Coverage of cities of Decatur, Effingham, and Vandalia.  I-72 from Springfield
BTA to Champaign-Urbana BTA, I-70 from St. Louis BTA to Mattoon BTA, and I-57
from Mattoon BTA to Mt. Vernon-Centralia BTA.

BTA 225 Kankakee
Coverage of city of Kankakee.  I-57 from Chicago BTA to Champaign-Urbana BTA.

BTA 286 Mattoon
Coverage of cities of Mattoon and Charleston.  I-57 from Champaign-Urbana BTA to
Decatur-Effingham BTA and I-70 from Decatur-Effingham BTA to Terre Haute BTA.

BTA 308 Mt. Vernon-Centralia BTA
Coverage of cities of Mt. Vernon, Centralia, and Salem.  I-64 from St. Louis BTA
to Mt. Vernon and I-57 from Decatur-Effingham BTA to Carbondale-Marion BTA.

To be Hard Launched by July 1, 2001

Grand Rapids BTA 169
****

Muskegon BTA 310
****

Saginaw-Bay City BTA 390
****

Lansing BTA 241
****

Battle Creek BTA 33
****

To be Hard Launched by October 1, 2001

Grand Rapids BTA 169
****

Traverse City BTA 446
****

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

****

Saginaw-Bay City BTA 390
****

Mount Pleasant BTA 307
****

Waterloo-Cedar Falls BTA 462
****

Dubuque BTA 118
****

Burlington BTA 61
****

Ottumwa BTA 337
****

Des Moines BTA 111
****

Marshalltown BTA 283
****

To be Hard Launched by October 31, 2001

BTA 308 Mt. Vernon-Centralia BTA
****

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

<PAGE>

To be Hard Launched by December 1, 2001

Cedar Rapids BTA 70
****

Iowa City BTA 205
****

Norfolk BTA 323
****

Omaha BTA 332
****

Des Moines BTA 111
****

Mason City BTA 285
****

Fort Dodge BTA 150
****

To be Hard Launched by December 2002

BTA 86 Clinton-Sterling
****

BTA 105 Davenport-Moline
****

BTA Decatur-Effingham
****

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

<PAGE>

BTA 225 Kankakee
****

BTA 243 LaSalle-Peru-Ottowa-Streator
****

BTA 344 Peoria
****

BTA 426 Springfield
****

To be Hard Launched no later than December 31, 2004

Mason City BTA 285
****

Fort Dodge BTA 150
****

Des Moines BTA 111
****

Lincoln BTA 256
****

Grand Island-Kearney BTA 167
****

Hastings BTA 185
****

Des Moines MTA
****

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

<PAGE>

Limited Service Areas
Manager has partial responsibility, or Limited Service Area, in selected BTAs in
the Service Area.  The Manager's Limited Service Area BTAs are defined below.
In all areas where it is noted that Manager will meet Sprint PCS current or
planned coverage, Manager will work with Sprint PCS RF staff to determine the
exact location of Manager's sites in order to provide contiguous coverage with
Sprint PCS.

                            Des Moines, IA BTA 111
****

Omaha, NE BTA 332
****

Lincoln, NE BTA 256
****

Battle Creek, MI BTA 33
****

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

<PAGE>

Lansing, MI BTA 241
****

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

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