Document:

<PAGE>
                                                                   EXHIBIT 10.15

                                                                  Execution Copy

                         ROAMING AGREEMENT FOR GSM/GPRS

                                     between

                          AT&T WIRELESS SERVICES, INC.
                   having its principal place of business at:

                     7277 164th Avenue NE, Redmond, WA 98052
                       (hereinafter referred to as "AWS")

                                       and

                          AMERICAN CELLULAR CORPORATION
                   having its principal place of business at:

                               14201 Wireless Way
                             Oklahoma City, OK 73134
                       (hereinafter referred to as "ACC")

The above-mentioned Parties agree to establish Roaming between each other and
their respective controlled Subsidiaries, by operating GSM digital cellular
telecommunications service on the terms and conditions as stated below.

In this GSM/GPRS Roaming Agreement is included the General Terms and Conditions
for GSM Roaming and the Annexes (GSM Association Permanent Reference Documents
AA.13 and AA.14).

All references to GSM should read "GSM 850; GSM 900 and/or GSM 1800/1900"

The term "Agreement" used throughout the General Terms and Conditions for GSM
Roaming shall mean this Roaming Agreement for GSM/GPRS and the General Terms and
Conditions for GSM Roaming referred to above.

In case of additional requirements, exceptions and/or contradictions between the
Agreement and any Technical Specifications (as defined below) or GSM Association
Permanent Reference Documents, the provisions of the Agreement shall prevail.

All notices, information and communication required under the Agreement shall be
given as described in Annex C.1: Agreement Management Principles.

<PAGE>

AT&T WIRELESS SERVICES, INC.               AMERICAN CELLULAR CORPORATION

Having its principal place of              Having its principal place of
business:                                  business:

7277 164th Avenue NE                       14201 Wireless Way
Redmond WA 98052                           Oklahoma City, OK 73134

By: /s/ MARK BRADNER                       By: /s/ EVERETT R. DOBSON
   ----------------------------------         ----------------------------------
Name:                                      Name:
Title:                                     Title:

Date:  July 11, 2003                       Date:  July 11, 2003
     --------------------------------           --------------------------------

                                       2

<PAGE>

                                TABLE OF CONTENTS

<Table>
<Caption>
                                                                                                       Page
                                                                                                       ----
<S>                                                                                                    <C>
1.    Parties............................................................................................4

2.    Introduction.......................................................................................4

3.    Definitions........................................................................................4

4.    Annexes............................................................................................6

5.    Scope of the Agreement.............................................................................6

6.    Implementation of the network and services.........................................................7

7.    Modifications......................................................................................7

8.    Charging, Billing and Accounting...................................................................8

9.    Customer Care.....................................................................................12

10.      Confidentiality................................................................................12

11.      Data Privacy...................................................................................13

12.      Fraud Prevention...............................................................................13

13.      Liability of the Parties.......................................................................14

14.      Suspension of Services.........................................................................14

15.      Force Majeure..................................................................................15

16.      Duration of the Agreement......................................................................15

17.      Termination of the Agreement...................................................................16

18.      Changes to the Agreement, Annexes and Addenda..................................................16

19.      Miscellaneous..................................................................................17

20.      Choice of Law..................................................................................18

21.      Dispute Resolution & Arbitration...............................................................18
</Table>

                                       3
<PAGE>

1. PARTIES

                  General Terms and Conditions for GSM Roaming apply for the
                  Parties who have signed the Roaming Agreement

2. INTRODUCTION

2.1               The Parties have expressed their wish to make a bilateral
                  agreement for the establishment of Roaming Services between
                  their GSM/GPRS networks and it is therefore agreed as follows:

3. DEFINITIONS

                  For the purpose of the Agreement the following terms shall
         have the meanings set forth in their respective definitions, unless a
         different meaning is specified in another provision in the Agreement:

                  "3GPP" shall mean the Third Generation Partnership Project.

                  * is defined in Section 5.2 of the GSM Operating Agreement, it
                  being understood that such * may not be reciprocal, i.e. the
                  tariffs for GSM and GPRS Roaming charged by the applicable
                  VPMN Operator may be different.

                  "EDGE" shall mean Enhanced Data for GSM Evolution, a wireless
                  communications technology based on GSM and defined by the
                  relevant ETSI or 3GPP standards.

                  "ETSI" shall mean the European Telecommunications
                  Standardisation Institute.

                  "GPRS Roaming" shall mean General Packet Radio Service
                  Roaming, providing packet mode transmission between PMNs and
                  interworking with external network, including GPRS Roaming
                  using EDGE. GPRS Roaming allows the service subscriber to send
                  and receive data in an end-to-end packet transfer mode,
                  without utilizing network resources in circuit switched mode,
                  outside of their HPMN.

                  "GSM" shall mean Global System for Mobile communications, a
                  wireless communications technology defined by the relevant
                  ETSI or 3GPP standards.

                  "GSM Association Permanent Reference Documents" shall mean the
                  documents that are established, recognized and classified as
                  binding by the GSM Association Plenary.

                  "GSM Association Plenary" shall mean the group of appointed
                  representatives of the Signatories of the GSM Association.

         * Confidential information has been omitted and filed separately with
         the Securities and Exchange Commission.

                                       4
<PAGE>

                  "GSM Operating Agreement" shall mean the GSM Operating
                  Agreement of even date herewith between the Parties.

                  "GSM Roaming" shall mean GSM Roaming which means providing
                  circuit mode and packet mode transmission between PMNs. GSM
                  Roaming allows the service subscriber to send and receive data
                  in an end-to-end packet transfer mode outside their HPMN and
                  also make circuit switched connections, such as voice calls.

                  "HPMN" shall mean home public mobile network.

                  "HPMN Operator" shall mean a Party who is providing Services
                  to its subscribers in a geographic area where it holds a
                  license or has a legal right to establish and operate a GSM
                  network.

                  "Memorandum of Understanding of GSM Association" shall mean
                  the agreement signed by the Network Operators and/or
                  Authorities on 7th September 1987 and the Addendum to the
                  Memorandum of Understanding dated 24th September 1991.

                  "MOU" shall mean a minute of use.

                  "Offering Memorandum" means the Offering Memorandum,
                  Solicitation of Consents and Votes, Plan of Reorganization,
                  Disclosure Statement and Ballot issued by ACC and DCC on July
                  14, 2003.

                  "Party" shall mean a signatory hereto.

                  "PDP" shall mean Packet Data Protocol.

                  "Person" shall mean an individual, corporation, limited
                  liability company, partnership or other legal entity.

                  "PMN" shall mean a public mobile network.

                  "PMN Operator" shall mean a Person operating a PMN.

                  "Restructuring" is defined in the Offering Memorandum.

                  "Roaming Subscriber" shall mean a Person with valid
                  subscription for use issued by one of the Parties and using a
                  GSM SIM (Subscriber Identity Module) and/or a GSM USIM
                  (Universal Subscriber Identity Module) who seeks GSM
                  service(s) in a geographic area outside the area served by its
                  HPMN Operator.

                  "Roaming" shall mean use of the network of the VPMN Operator
                  by the subscribers of the HPMN Operator, which shall include
                  GSM Roaming and GPRS Roaming.

                  "Services" shall mean the services for Roaming as agreed upon
                  by the Parties in AA.14 and may include:

                                       5
<PAGE>

                           o        Circuit Switched based services, hereinafter
                                    called "CS" as specified in AA.14, Annex
                                    1.2, article I.2.1; and/or

                           o        Packet Switched based services, hereinafter
                                    called "GPRS" as specified in AA.14, Annex
                                    1.2, article I.2.2

                  "Session" shall mean the time between PDP Context activation
                  until PDP Context deactivation.

                  "SMS" shall mean short alphanumeric messages up to 160
                  characters in length utilizing the digital control channel.

                  A "Subsidiary" of a Party means any other Person directly or
                  indirectly owned or controlled by the Party, for so long as
                  such ownership or control lasts. Ownership or control shall
                  exist through the direct or indirect ownership of more than
                  50% of the nominal value of the issued equity share capital or
                  of more than 50% of the shares entitling the holders to vote
                  for the election of directors or Persons performing similar
                  functions.

                  "TAP" shall mean Transferred Account Procedure as defined and
                  described in GSM Association Permanent Reference Documents.

                  "Technical Specifications" shall mean the technical
                  specifications defined and adopted by 3GPP (Third Generation
                  Partnership Project), including the ETSI technical
                  specifications defined and adopted by 3GPP.

                  "VPMN" shall mean a visiting public mobile network.

                  "VPMN Operator" shall mean a Party who allows Roaming
                  Subscribers to use its GSM network(s).

4. ANNEXES

                  The Annexes are divided as set out in the Overview of the
                  Annex Structure, in Common Annexes and in 2 sets of individual
                  Annexes; one set for each Party.

5. SCOPE OF THE AGREEMENT

5.1               In respect of and subject to their licenses or rights and
                  other national binding regulations to establish and operate
                  GSM networks, the Parties to the Agreement agree to establish
                  Roaming between the GSM/GPRS network(s) owned and operated by
                  themselves and their respective Subsidiaries in accordance
                  with relevant Technical Specifications and GSM Association
                  Permanent Reference Documents, including all the commercial
                  aspects, as defined in the Annexes hereto or as may be amended
                  from time to time in accordance with the terms of the
                  Agreement.

                                       6
<PAGE>

5.2               Additional requirements and exceptions to the Technical
                  Specifications and GSM Association Permanent Reference
                  Documents, as agreed between the Parties, are detailed in the
                  Annexes to the Agreement or as may be amended from time to
                  time in accordance with the terms of the Agreement.

6. IMPLEMENTATION OF THE NETWORK AND SERVICES

6.1               Network Implementation

                  The Parties agree to comply in all material respects with the
                  relevant requirements and procedures of the GSM Association
                  Permanent Reference Documents agreed by the GSM Association
                  from time to time and as amended by the GSM Association from
                  time to time.

6.2               Services

             6.2.1    The Services provided by each Party are defined in
                      Annex I.2 as may be amended from time to time.

             6.2.2    The Services made available to individual Roaming
                      Subscribers shall only be those for which the Roaming
                      Subscribers have valid subscriptions in their HPMN.

             6.2.3    Both Parties agree that their Subscribers, while Roaming,
                      may experience conditions of service different from the
                      conditions in their HPMN.

             6.2.4    The Parties shall use reasonable best efforts to complete,
                      as soon as practicable, all test procedures necessary in
                      order to enable the Parties to provide Services hereunder.

7. MODIFICATIONS

7.1               Nothing in this Agreement shall limit either Party's right to
                  implement new Services or change its existing Services as it
                  sees fit. Each Party agrees to use its best efforts to give
                  the other Party at least four (4) weeks written notice of any
                  major change which has an impact on Roaming.

7.2               Following such notice of change both Parties agree to discuss
                  the impact of any such change for Roaming Subscribers,
                  including Roaming Subscribers' access to these Services, and
                  the necessary actions to be performed, e.g. testing or
                  administrative activities.

                                       7
<PAGE>

8. CHARGING, BILLING AND ACCOUNTING

8.1               Charging and tariffs

             8.1.1    Both Parties agree that when a Roaming Subscriber
                      uses the Services of the VPMN Operator, the Roaming
                      Subscriber's HPMN Operator shall be responsible for
                      payment of charges for the Services so used in
                      accordance with the tariffs of the VPMN Operator
                      stated in Annex I.3.1. Notwithstanding the foregoing,
                      the Parties agree that, for the duration of this
                      Agreement, and not subject to change pursuant to
                      Article 8.1.3 below, the VPMN Operator tariffs for
                      domestic GSM and GPRS Roaming shall be determined in
                      accordance with the provisions of this Section 8.1.1.

         (a)      Rates for Contract Years 1-3

                  (i) Table Rates. The VPMN Operator tariffs for domestic GSM
         and GPRS Roaming for the first three Contract Years shall be the rates
         set forth opposite such Contract Years in the table below ("Table
         Rates"). "Contract Years" means the five consecutive annual periods
         commencing on the date hereof.

<Table>
<Caption>
                                                                                            SMS
                                                                                          Rate per
                                                         GSM Rate     GPRS/EDGE Rate      Message
           Contract Year            Period               per MOU       per Kilobyte     Originated*
           -------------       ----------------          -------      --------------    -----------
<S>                            <C>                       <C>          <C>               <C>
                 1             7/1/03 - 6/30/04             *                *               *
                 2             7/1/04 - 6/30/05             *                *               *
                 3             7/1/05 - 6/30/06             *                *               *
                 4             7/1/06 - 6/30/07             *                *               *
                 5             7/1/07 - 6/30/08             *                *               *
</Table>

*        Includes TDMA, GSM, GPRS, EDGE. No charge for messages terminated. Rate
subject to adjustment in accordance with Section 8.1.1(g).

------------
* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

                                       8
<PAGE>

         (b)      Rates for Contract Years 4-5

                  (i) Negotiated Rates. At any time during the third quarter of
         Contract Year 3, if the Parties have not adopted *, ACC may (but shall
         not be obligated to) initiate, by notice to AWS, a 30-day period of
         roaming rate and exclusivity negotiations, provided, that such 30-day
         period must be commenced and completed within the third quarter of
         Contract Year 3. If negotiations are initiated by ACC, both Parties
         will negotiate in good faith to seek to agree on fair and reasonable
         GSM and GPRS roaming rates and exclusivity provisions for Contract
         Years 4 and 5.

                  (ii) Formula Rates. If ACC initiates the negotiation
         contemplated in clause (b)(i) and the Parties do not agree on GSM and
         GPRS roaming rates and exclusivity provisions for Contract Years 4 and
         5 during the aforementioned 30-day period, AWS will deliver to ACC,
         within 30 days following the end of the third quarter of Contract Year
         3, its calculation of the Formula Rates for the 12-month period ending
         at the end of the third quarter of Contract Year 3. Within ten business
         days after receipt of such calculation, ACC will notify AWS whether it
         elects to have such Formula Rates (or, if lower, the Table Rates for
         Contract Year 4) apply to Contract Year 4. If ACC so elects, then (x)
         the Formula Rates (as set forth in the aforementioned calculation) or,
         if lower, the Table Rates for Contract Year 4 will apply to Contract
         Year 4, (y) the Formula Rates (as determined pursuant to the
         definitions of ARPMin and ARPByte) or, if lower, the Table Rates for
         Contract Year 5 will apply to Contract Year 5 and (z) the exclusivity
         obligations of AWS under Article 4 of the GSM Operating Agreement will
         continue in effect during Contract Years 4 and 5, subject to the terms
         and conditions of the GSM Operating Agreement.

                  (iii) Table Rates. If either (x) ACC does not initiate
         negotiations pursuant to Section 8.1.1(b)(i) or (y) ACC initiates the
         negotiation of rates and exclusivity, the Parties are unable to agree
         upon new rates or exclusivity, and ACC elects not to apply the Formula
         Rates (or, if lower, the Table Rates for Contract Year 4) to Contract
         Year 4 (or fails to make a timely election), then (A) the Table Rates
         for Contract Year 3 * will apply to Contract Years 4 and 5 and (B) if
         the Parties have not adopted *, the obligations of AWS under Section 4
         of the GSM Operating Agreement will terminate at the end of Contract
         Year 3.

------------
* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

                                       9
<PAGE>
                  (iv) *.

         (c) Rates after Contract Year 5. If the Term of the Agreement is
extended for any period after Contract Year 5 pursuant to Section 5.2 of the GSM
Operating Agreement, the VPMN Operator tariffs for domestic GSM and GPRS Roaming
for such period will be *.

         (d) Voice over Internet Protocol. Once Voice over Internet Protocol
("VoIP") is implemented in the ACC GSM Systems (as defined in the GSM Operating
Agreement), voice traffic utilizing this technology will be measured in
kilobytes, and accordingly it will be necessary to convert kilobytes into voice
MOUs for billing purposes. Unless a more accurate equivalent is available at the
time of VoIP implementation, the following kilobytes per voice MOU equivalent
shall be used unless the Parties otherwise agree. Prior to implementation of the
Adaptive Multi-Rate ("AMR") codec, 720 kilobytes per MOU equivalent shall be
used for billing purposes. After the implementation of the AMR codec, 300
kilobytes per MOU equivalent shall be used for billing purposes. The Parties
shall implement the AMR codec in their respective GSM Systems (as defined in the
GSM Operating Agreement) as soon as commercially practicable, and shall use
commercially reasonable efforts to adopt improved speech codecs as and when they
become generally available on commercially reasonable terms.

         (e)      Definitions

                  "ARPByte" means, with respect to any 12-month period, a rate
         per minute calculated by dividing AWS GPRS and succeeding data
         technology revenue for the immediately preceding 12-month period by AWS
         billed kilobytes for the immediately preceding 12-month period. For
         purposes of this definition, AWS GPRS and succeeding data technology
         revenue includes home revenue and incollect revenue from GPRS and
         succeeding data technologies (including but not limited to EDGE and
         UMTS) but excludes outcollect revenue and equipment revenue; and AWS
         billed kilobytes includes home kilobytes and incollect kilobytes from
         GPRS and succeeding data technologies (including but not limited to
         EDGE and UMTS).

                  "ARPMin" means, with respect to any 12-month period, a rate
         per minute calculated by dividing AWS gross revenue for the immediately
         preceding 12-month period by AWS billed minutes for the immediately

* Confidential information has been omitted and filed separately with the
  Securities and Exchange Commission.

                                       10
<PAGE>

         preceding 12-month period. For purposes of such definition, AWS gross
         revenue includes all AWS revenue except outcollect revenue and
         equipment revenue; and AWS billed minutes includes all home MOUs and
         incollect MOUs.

                   "Formula Rate" means (i) with respect to GPRS Roaming, a rate
         per kilobyte equal to *, and (ii) with respect to GSM Roaming, a rate
         per minute equal to *

         (f) Quarterly Reports. From the beginning of Contract Year 2 until the
end of Contract Year 3, if ACC so requests, AWS will deliver to ACC, on a
quarterly basis, reports setting forth the components of the calculation of its
monthly ARPMin and ARPByte rates.

         (g) SMS Arrangements. The SMS rate will be *per message originated;
provided, that if the parties are able to connect their SMS networks directly,
the SMS rate will be *per message originated. The parties will use commercially
reasonable efforts to connect their SMS networks directly.

         8.1.2    However, the HPMN Operator shall not be liable for the payment
                  of charges for chargeable Services provided by the VPMN
                  Operator without Subscriber Identity Authentication as defined
                  in GSM Association Permanent Reference Documents, except to
                  the extent that the HPMN Operator actually recovers all
                  charges due in relation to the Roaming Subscriber. In the case
                  of re-authentication malfunction, procedures are further
                  detailed in Annex I.5.2.

         8.1.3    Notwithstanding Article 18.1 either Party shall have the right
                  to vary its tariff stated in the Annex I.3.1 or subsequent
                  variation thereof, other than those set forth in 8.1.1 above.
                  In the case of scheduled changes (as described in BA.27) a
                  Party shall give 60 days written notice of any variation to
                  its tariff and the new change shall take effect on the first
                  day of the month following the expiration of the 60 day notice
                  period. In the case of unscheduled changes (as described in
                  BA.27) a Party shall use all reasonable endeavours to give
                  adequate notice of such changes and the new change shall take
                  effect on the first day following the expiration of the notice
                  period given. Any variation in the tariff shall be deemed to
                  be incorporated into the Agreement.

8.2           Implementation of TAP

------------
* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

                                       11
<PAGE>

                  The implementation of TAP shall be done according to the GSM
                  Association Permanent Reference Documents and the provisions
                  set out in the Annex C.3.1.

8.3               Billing and Accounting

                  The implementation of billing and accounting shall be done
                  according to the GSM Association Permanent Reference Documents
                  and the provisions set out in Annex C.3.2 as amended from time
                  to time or where there is a differing accounting practice or
                  regulations in the U.S., the U.S. practice or regulations
                  shall prevail.

9. CUSTOMER CARE

                  The responsibilities of each Party concerning Customer Care
                  are described in Annex C.4.

10. CONFIDENTIALITY

10.1              The Parties agree that all aspects of the contents of the
                  Agreement shall be treated as confidential and that no
                  information in respect of the content of the Agreement shall
                  be disclosed without the prior written consent of both of the
                  Parties except (i) as required by law or legal process, (ii)
                  to a Party's employees who need to know same and such Party's
                  attorneys, advisors, representatives, agents, lenders,
                  insurers, and current or potential investors (collectively,
                  "its Representatives"), (iii) in the Offering Memorandum and
                  such other disclosure documents as, in the good faith judgment
                  of DCC's outside legal counsel, are necessary to effect the
                  Restructuring ("Reorganization Disclosure") and (iv) as
                  necessary to implement the Agreement and inform customers.

10.2              The Parties hereby agree to treat all information exchanged
                  between them in connection with the Agreement (hereinafter
                  referred to as "Information") as confidential and agree not to
                  disclose such Information in any manner whatsoever, in whole
                  or in part except as provided in this Article 10. The other
                  Party shall not use any Information other than in connection
                  with (i) the discussions between them and any transactions
                  resulting therefrom, (ii) for the purpose of obtaining funds
                  or insurance or in connection with any bona fide business
                  transaction, in which case the disclosing Party shall advise
                  the lenders or insurance companies of such Party's
                  confidentiality obligation under this Article 10 before
                  disclosing the Information and (iii) Reorganization
                  Disclosure. Each Party shall be liable in accordance with
                  Article 13 to the other Party in respect of any unauthorized
                  disclosure of

                                       12
<PAGE>

                  Information made by its Representatives to whom it has
                  disclosed Information.

10.3              In addition to the above, Information may be transmitted to
                  governmental, judicial or regulatory authorities, as may be
                  required by any governmental, judicial or regulatory
                  authority, provided, that the Party transmitting such
                  Information gives the other Party reasonable notice and
                  opportunity to seek confidential treatment of such Information
                  by any such authority.

10.4              For the purposes of the Agreement, Information shall not be
                  considered to be confidential if such Information is:

                  a)       in or passed into the public domain other than by
                           breach of this Article;

                  b)       known to a receiving Party prior to the disclosure by
                           a disclosing Party;

                  c)       disclosed to a receiving Party without restriction by
                           a third Party having the full right to disclose; or

                  d)       independently developed by a receiving Party to whom
                           no disclosure of confidential Information relevant to
                           such Information has been made.

10.5              Article 10 shall survive the termination of the Agreement for
                  a period of two years.

11. DATA PRIVACY

11.1              Each Party's obligations hereunder to transfer Information to
                  the other Party shall not apply to the extent that a Party is
                  prohibited from doing so by applicable regulations and laws
                  applicable to Roaming and/or data protection.

11.2              The Parties confirm that they shall comply with applicable
                  Data Privacy Regulations/Laws. Further Details of Data Privacy
                  aspects are given in Annexes C.6. and I.6.

12. FRAUD PREVENTION

                  The Parties shall co-operate in good faith regarding the
                  procedures concerning fraudulent or unauthorized use by
                  Roaming Subscribers. Details of Fraud Prevention procedures
                  are given in Annex C.7.

                                       13
<PAGE>

13. LIABILITY OF THE PARTIES

                  In no event shall either Party be liable for any consequential
                  damage or loss of whatsoever nature, including but not limited
                  to, loss of profit or loss of business.

14. SUSPENSION OF SERVICES

14.1              Suspension of Services to individual Roaming Subscribers or
                  all Roaming Subscribers

                  Notwithstanding anything in the Agreement to the contrary, the
                  VPMN Operator may without liability suspend or terminate all
                  or any of its Services to Roaming Subscriber(s) in
                  circumstances where it would suspend or terminate those
                  Services to its own subscribers, including but not limited to:

                  a)       subscribers using equipment which is defective or
                           illegal;

                  b)       subscribers causing any technical or other problems
                           on the VPMN Operator's network;

                  c)       suspected fraudulent or unauthorized use;

                  d)       authentication of the subscription not being
                           possible; or

                  e)       maintenance or enhancement of the network.

14.2              Suspension of Services to all Roaming Subscribers by VPMN
                  Operator

                  In case of a proposed suspension of Services to all Roaming
                  Subscribers, the VPMN Operator shall use its best efforts to
                  give four (4) weeks written notice to the other Party prior to
                  the suspension taking effect. If the suspension continues for
                  more than six (6) months, the other Party shall have the right
                  to terminate the Agreement by written notice.

14.3              Suspension of Services to all Roaming Subscribers by HPMN
                  Operator

                  The HPMN Operator has the right at any time, without
                  discriminating among operators and without liability, in the
                  event of suspected fraudulent or unauthorized use of the VPMN
                  network, by giving reasoned written notice to the VPMN
                  Operator, to suspend access to the VPMN Services for its own
                  subscribers Roaming in the VPMN, or if it is technically more
                  practicable, to require that the

                                       14
<PAGE>

                  VPMN Operator takes actions to suspend all of its Services to
                  Roaming Subscribers of the HPMN Operator. The VPMN Operator
                  shall use its best efforts to comply with such requirement
                  within five (5) working days after receipt of the notice.

                  The suspension shall be removed as soon as the reason for the
                  suspension has been overcome by the VPMN Operator to the
                  reasonable satisfaction of the HPMN Operator.

15. FORCE MAJEURE

15.1              Non-performance or defective performance of either Party's
                  obligations pursuant to the Agreement or delay in performing
                  same shall not constitute a breach of the Agreement to the
                  extent, and for as long as, it is due to reasons outside such
                  Party's control (in each case a "Force Majeure Event"),
                  including, but not being limited to, governmental action, or
                  requirement of regulatory authority, acts of God, terrorism,
                  riots, revolution, lockouts, strikes, shortage of
                  transportation, war, rebellion or other military action, fire,
                  flood, explosion, sabotage, nuclear incidents, earthquakes,
                  lightning, storms, sinkholes, epidemics, delays or
                  non-performance of suppliers or subcontractors, natural
                  catastrophes, or any other unforeseeable obstacles that a
                  Party is not able to overcome with reasonable efforts. The
                  Party prevented from fulfilling its obligations shall on
                  becoming aware of such Force Majeure Event inform the other
                  Party in writing of such Force Majeure Event as soon as
                  possible. If the Force Majeure Event continues for more than
                  six (6) consecutive months, either Party shall have the right
                  to terminate the Agreement with immediate effect by written
                  notice.

15.2              If the affected Party fails to inform the other Party of the
                  occurrence of a Force Majeure Event in accordance with Article
                  15.1 above, then such Party thereafter shall not be entitled
                  to refer to such event as force majeure as a reason for
                  non-fulfillment, to the extent such Party is disadvantaged by
                  such delay. This obligation does not apply if the Force
                  Majeure Event is known by both Parties or the affected Party
                  is unable to inform the other Party due to the Force Majeure
                  Event.

16. DURATION OF THE AGREEMENT

                  The term of the Agreement (the "Term") shall commence on the
                  date hereof and, unless the Agreement shall have earlier
                  terminated in accordance with Section 17.1, shall expire on
                  the fifth anniversary of the date hereof, subject to Section
                  5.2 of the GSM Operating Agreement.

                                       15
<PAGE>

17. TERMINATION OF THE AGREEMENT

17.1              In addition to the provisions of Article 16, the Agreement may
                  be terminated as follows:

                  a)       by mutual agreement of the Parties;

                  b)       by one of the Parties, with immediate effect, when
                           the other Party is in material breach of the
                           Agreement and does not remedy, such breach within
                           thirty (30) days of receipt of a written notice to
                           such effect;

                  c)       by one of the Parties, with immediate effect, if the
                           other Party becomes bankrupt or insolvent or enters
                           into any composition or arrangement with its
                           creditors, except in accordance with the plan of
                           reorganization of ACC contemplated by the Offering
                           Memorandum, and that other Party is not able to
                           ensure performance of its monetary obligations under
                           the Agreement by a guarantee from a first class bank,
                           payable on first written demand;

                  d)       by written notice of either Party to the other in the
                           event that Roaming becomes technically or
                           commercially impracticable on either Party's network
                           and the provisions set out in Article 14 are not
                           sufficient to solve the problem or if an unacceptable
                           level of unauthorized use occurs and the other Party
                           is not capable of remedying such unauthorized use to
                           normal levels within sixty (60) days of receipt of a
                           written notice to such effect; or

                  e)       subject to Article 19.1 by one of the Parties, with
                           immediate effect and as to the affected licensed area
                           only, in the event a final order by the relevant
                           governmental authority revoking or denying renewal of
                           the GSM license(s) or permission to operate a GSM
                           network(s) granted to the other Party, or any other
                           license necessary to operate the GSM Service(s),
                           takes effect.

18. CHANGES TO THE AGREEMENT, ANNEXES AND ADDENDA

18.1              Any amendments and/or additions to the Agreement and/or
                  Annexes and/or Addenda shall be valid only if made in writing
                  and signed by duly authorized representatives of both Parties
                  hereto.

18.2              It is also recognized by the Parties that it may be
                  appropriate to seek changes to the Agreement in the light of
                  experience and development in the GSM Association and the
                  establishment of Roaming between the Parties. Accordingly, in
                  such event the Parties shall enter into good faith discussions
                  with a view to agreeing mutually acceptable modifications to
                  the Agreement.

                                       16
<PAGE>

                  Without limiting the generality of the foregoing, the Parties
                  agree to modify the Agreement as contemplated by Section
                  5.2(a) of the GSM Operating Agreement.

19. MISCELLANEOUS

19.1              Entire Agreement

                  The Agreement and the GSM Operating Agreement, together with
                  any annexes, schedules and exhibits hereto and thereto,
                  contain the entire agreement and understanding of the Parties
                  relating to the subject matter hereof and thereof, and
                  supersede all prior negotiations, proposals, offers,
                  agreements and understandings (written or oral) relating to
                  such subject matter.

19.2              Successors and Assigns

                  The Agreement and the rights and obligations specified herein
                  shall be binding upon the Parties hereto and their respective
                  permitted successors and permitted assigns, and neither Party
                  shall sell, transfer or assign the Agreement or any part,
                  interest, right or obligation hereunder, including by
                  operation of law, except that a Party shall have the right to
                  transfer or assign the Agreement in whole (but not in part) to
                  a Subsidiary who is also the Signatory to the GSM Association
                  and ACC shall have the right to transfer or assign the
                  Agreement in whole to a Subsidiary of Dobson Communications
                  Corporation that directly or indirectly owns, operates and
                  controls wireless communications systems in the ACC Markets
                  (as defined in the GSM Operating Agreement) and does not own,
                  manage, operate or control any other wireless communications
                  systems, provided, that such assignee expressly assumes, by
                  written instrument approved by the Parties, all of the
                  obligations of such Party hereunder and thereby becomes a
                  Party hereunder, it being understood that such assignment
                  shall not release the assigning Party of its obligations under
                  Article 10 of this Agreement. No person other than a Party to
                  the Agreement shall acquire any rights hereunder as a
                  third-party beneficiary or otherwise by virtue of the
                  Agreement.

19.3              Headings

                  The headings of the Agreement are for the convenience of
                  reference only and shall in no way limit or affect the meaning
                  or interpretation of the provisions of the Agreement.

19.4              No waiver

                                       17
<PAGE>

                  Failure by any Party at any time or times to require
                  performance of any provisions of the Agreement shall in no
                  manner affect its rights to enforce the same, and the waiver
                  by any Party of any breach of any provisions of the Agreement
                  shall not be construed to be a waiver by such Party of any
                  succeeding breach of such provision or waiver by such Party of
                  any breach of any other provision hereof.

19.5              Provisions severable

                  If any part of the Agreement is held to be invalid or
                  unenforceable, such determination shall not invalidate any
                  other provision of the Agreement; and the Parties shall
                  attempt, through negotiations in good faith, to replace any
                  part of the Agreement so held to be invalid or unenforceable.
                  The failure of the Parties to agree on such replacement shall
                  not affect the validity of the remaining parts of the
                  Agreement.

20. CHOICE OF LAW

                  The Agreement and any matters relating hereto shall be
                  governed by and construed in accordance with the internal laws
                  of the State of Delaware.

21. DISPUTE RESOLUTION & ARBITRATION

21.1              If a dispute arises out of or relating to this Agreement, or
                  the transactions contemplated hereby, or the construction,
                  interpretation, performance, breach, termination,
                  enforceability or validity thereof, whether such claim is
                  based on rights, privileges or interests recognized by or
                  based upon contract, tort, fraud, misrepresentation, statute,
                  common law or any other legal or equitable theory, and whether
                  such claim existed prior to or arises on or after the date
                  hereof (a "Dispute"), the dispute resolution processes set
                  forth in this Article 21 shall govern the resolution of such
                  dispute.

21.2              If a Dispute cannot be resolved by the executives having
                  primary managerial responsibility for the matter to which the
                  Dispute pertains, the Parties shall attempt in good faith to
                  resolve such Dispute promptly by negotiation between
                  executives who have authority to settle the Dispute and who
                  are at the level of the executives who have negotiated this
                  Agreement ("Senior Party Representatives").

21.3              A Party may provide any other Party notice (a "Dispute
                  Notice") of any Dispute that has not been resolved in the
                  normal course of business. Within ten business days after
                  delivery of the Dispute

                                       18
<PAGE>

                  Notice, the receiving Party shall submit to each other Party a
                  response (the "Response"). The Dispute Notice and the Response
                  shall each include (a) a statement setting forth the position
                  of the Party providing such notice and a summary of arguments
                  supporting such position, and (b) the name and title of such
                  Party's Senior Party Representative and any other Persons who
                  will accompany the Senior Party Representative at the meeting
                  at which the Parties will attempt to settle the Dispute.
                  Within 30 business days after delivery of the Dispute Notice,
                  the Senior Party Representatives of the Parties shall meet at
                  a mutually acceptable time and place, and thereafter as often
                  as they reasonably deem necessary, to attempt to resolve the
                  Dispute. All reasonable requests for information made by one
                  Party to another will be honored.

21.4              If the Dispute has not been resolved within 50 business days
                  after delivery of the Dispute Notice, or if the Parties fail
                  to meet within 30 business days after delivery of the Dispute
                  Notice, any Party may initiate arbitration of the Dispute as
                  provided below. If no Party initiates arbitration within 60
                  business days after delivery of the Dispute Notice, then the
                  Parties shall automatically be released from any and all
                  liability for the Dispute.

21.5              All negotiations pursuant to this section shall be treated as
                  compromise and settlement negotiations. Nothing said or
                  disclosed, nor any document produced, in the course of such
                  negotiations that is not otherwise independently discoverable
                  shall be offered or received as evidence or used for
                  impeachment or for any other purpose in any current or future
                  arbitration. The Parties agree that all communications and
                  negotiations between the Parties during the dispute resolution
                  process, any settlements agreed upon during the dispute
                  resolution process and any information regarding the other
                  Party obtained during the dispute resolution process (that are
                  not already public knowledge) are confidential and may be
                  disclosed only to employees and agents of the Parties who
                  shall have a "need to know" the information and who shall have
                  been made aware of the confidentiality obligations set forth
                  in this Article 21, unless the Party is required by law to
                  disclose such information.

21.6              If the Dispute is not resolved as provided in Sections 21.2
                  through 21.4 above, then any Party may initiate arbitration
                  proceedings by providing each other Party notice of such
                  initiation of arbitration. The Dispute shall then be settled
                  by arbitration in accordance with the CPR Non-Administered
                  Arbitration Rules in effect on the date hereof, by a panel of
                  three arbitrators. Each Party shall select one

                                       19
<PAGE>

                  of the three arbitrators and the two arbitrators so chosen
                  shall select the third arbitrator. The arbitrators shall be
                  governed by the United States Arbitration Act, 9 U.S.C.
                  Sections 1-16, and judgment upon the award rendered by the
                  arbitrators may be entered by any court having jurisdiction
                  thereof. The place of arbitration shall be chosen by the three
                  arbitrators. The arbitrators shall not order pre-hearing
                  discovery of documents or the taking of depositions, although
                  the arbitrators may compel the attendance of witnesses and the
                  production of documents at the hearing to the extent permitted
                  by the CPR Non-Administered Arbitration Rules.

21.7              If a Party does not provide a Dispute Notice within one year
                  following the time the Party first knows of the existence of
                  the acts or omissions that give rise to the Dispute, the Party
                  shall be forever estopped from asserting the Dispute against
                  any other Party.

21.8              The reasonable out-of-pocket costs (including reasonable
                  attorneys' fees and expenses) of the prevailing Party and the
                  fees of the arbitrators in any arbitration proceeding pursuant
                  to this Article 21 shall be paid by the other Party. The
                  arbitrators shall determine which Party is the prevailing
                  Party for purposes of this paragraph, and shall include such
                  determination in their award. If the arbitrators determine
                  that neither Party is the prevailing Party for purposes of
                  this paragraph, then each Party shall bear its own costs and
                  expenses, including attorneys' fees and expenses, and the
                  Parties shall share equally the fees of the arbitrators.

21.9              Notwithstanding the foregoing, nothing in this Agreement shall
                  preclude the Parties from seeking injunctive or other
                  equitable relief from a court with regard to any breach of
                  this Agreement.

                                       20
<PAGE>

OVERVIEW OF THE ANNEX STRUCTURE

COMMON ANNEXES:

<Table>
<Caption>
ANNEX NO.                          ANNEX NAME
---------                          ----------
<S>                                <C>
ANNEX C.1                          Agreement Management Principles
ANNEX C.2                          Services
ANNEX C.3                          Billing and Accounting
         ANNEX C.3.1               Information on Billing Data
         ANNEX C.3.2               Settlement Procedure
ANNEX C.4                          Customer Care Principles
ANNEX C.5                          Technical Aspects
         ANNEX C.5.1               Testing
         ANNEX C.5.2               Security
         ANNEX C.5.3               Information on Signalling Interconnection and / or
                                      IP Connectivity
ANNEX C.6                          Data Privacy, General Principles
ANNEX C.7                          Fraud Prevention Procedures
ANNEX C.8                          Additional annexes (optional)
</Table>

                                       21
<PAGE>

INDIVIDUAL ANNEXES:

<Table>
<Caption>
                         AWS                                                    ACC
------------------------------------------------------  -----------------------------------------------------
ANNEX I                      ANNEX NAME                 ANNEX I                    ANNEX NAME
SECTION NO.:                                            SECTION NO.:
--------------------------   -------------------------  -----------------------    --------------------------
<S>                          <C>                        <C>                        <C>
0                            REVISION SHEET             0                          REVISION SHEET

1                            AGREEMENT MANAGEMENT       1                          AGREEMENT MANAGEMENT
                             PRINCIPLES                                            PRINCIPLES

1.1                          Contact Points for         1.1                        Contact Points for
                             Agreement Management                                  Agreement Management

2                            SERVICES                   2                          SERVICES

2.1                          GSM services and GPRS PS   2.1                        GSM services and GPRS PS
                             Capabilities provided                                 Capabilities provided
                             for Roaming Subscribers                               for Roaming Subscribers

2.2                          Additional Services        2.2                        Additional Services
                             provided for Roaming                                  provided for Roaming
                             Subscribers                                           Subscribers

2.3                          SMS Interworking Services  2.3                        SMS Interworking Services

2.4                          GPRS PS Services and       2.4                        GPRS PS Services and
                             Applications                                          Applications

3                            BILLING AND ACCOUNTING     3                          BILLING AND ACCOUNTING

3.1                          GSM  Roaming Tariffs       3.1                        GSM  Roaming Tariffs

3.2                          Mailing list for TAP       3.2                        Mailing list for TAP

3.3                          Mailing list for Inter     3.3                        Mailing list for Inter
                             PMN Invoices                                          PMN Invoices

3.4                          Application of VAT         3.4                        Application of VAT

4                            CUSTOMER CARE              4                          CUSTOMER CARE

4.1                          Inter Operator Customer    4.1                        Inter Operator Customer
                             Care Contact                                          Care Contact

4.2                          Customer Services Numbers  4.2                        Customer Services Numbers
</Table>

                                       22
<PAGE>

<Table>
<S>                          <C>                        <C>                        <C>
4.3                          Customer Care Contact      4.3                        Customer Care Contact
                             Numbers                                               Numbers

5                            TECHNICAL ASPECTS          5                          TECHNICAL ASPECTS

5.1                          Contact Points for         5.1                        Contact Points for
                             Handling Test SIM and/or                              Handling Test SIM and/or
                             USIM Cards                                            USIM Cards

5.2                          Security                   5.2                        Security

6                            DATA PRIVACY               6                          DATA PRIVACY

6.1                          National Requirements      6.1                        National Requirements
                             for Data Privacy                                      for Data Privacy

7                            FRAUD PREVENTION           7                          FRAUD PREVENTION
                             PROCEDURES                                            PROCEDURES

7.1                          Information on Fraud       7.1                        Information on Fraud
                             Prevention Procedures                                 Prevention Procedures

8 ...                        ADDITIONAL ANNEXES         8 ...                      ADDITIONAL ANNEXES
                             (OPTIONAL)                                            (OPTIONAL)
</Table>

                                       23<PAGE>
                                                                   EXHIBIT 10.16

                                                                  Execution Copy

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

                             GSM OPERATING AGREEMENT

                                     between

                          AT&T WIRELESS SERVICES, INC.

                                       and

                          AMERICAN CELLULAR CORPORATION

                            Dated as of July 11, 2003

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

<PAGE>
                                TABLE OF CONTENTS

<Table>
<Caption>
                                                                                                       Page
                                                                                                       ----

<S>                                                                                                   <C>
ARTICLE 1 DEFINITIONS....................................................................................1

ARTICLE 2 GSM SYSTEMS....................................................................................5

         Section 2.1       Construction..................................................................5
         Section 2.2       Interoperability..............................................................6
         Section 2.3       Network Performance Standards.................................................6
         Section 2.4       Core Features and Services....................................................6

ARTICLE 3 EDGE AND NEW TECHNOLOGIES......................................................................7

         Section 3.1       EDGE..........................................................................7
         Section 3.2       New Technologies..............................................................7

ARTICLE 4 LIMITED EXCLUSIVITY............................................................................7

         Section 4.1       Limited Exclusivity...........................................................7
         Section 4.2       Competitive Transactions......................................................8
         Section 4.3       Limitations on Relief.........................................................9

ARTICLE 5 ROAMING PREFERENCE............................................................................10

         Section 5.1       Roaming Preference...........................................................10
         Section 5.2       *

ARTICLE 6 OTHER AGREEMENTS..............................................................................10

         Section 6.1       Further Assurances...........................................................10
         Section 6.2       Reporting Obligations........................................................10
         Section 6.3       Test Procedures..............................................................11
         Section 6.4       Funding......................................................................11
         Section 6.5       Compliance with Law..........................................................11
         Section 6.6       Confidentiality..............................................................11
         Section 6.7       Force Majeure................................................................12

ARTICLE 7 TERM AND TERMINATION..........................................................................13

         Section 7.1       Term.........................................................................13
         Section 7.2       Automatic Termination........................................................13
         Section 7.3       Termination by AWS...........................................................13
         Section 7.4       Termination by ACC...........................................................14
         Section 7.5       Effect of Termination........................................................14

ARTICLE 8 DISPUTE RESOLUTION............................................................................14
</Table>

----------

* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

<PAGE>
<Table>
<S>                                                                                                  <C>
ARTICLE 9 INDEMNIFICATION...............................................................................16

         Section 9.1       Indemnification by ACC.......................................................16
         Section 9.2       Indemnification by AWS.......................................................16
         Section 9.3       Procedures...................................................................17

ARTICLE 10 MISCELLANEOUS................................................................................18

         Section 10.1      Entire Agreement.............................................................18
         Section 10.2      Amendment; Waiver............................................................18
         Section 10.3      Specific Performance.........................................................18
         Section 10.4      Remedies Cumulative..........................................................18
         Section 10.5      Successors and Assigns.......................................................19
         Section 10.6      No Third Party Beneficiaries.................................................19
         Section 10.7      Further Assurances...........................................................19
         Section 10.8      Notices......................................................................19
         Section 10.9      Governing Law................................................................20
         Section 10.10     Severability.................................................................20
         Section 10.11     Independent Contractors......................................................20
         Section 10.12     Counterparts.................................................................20
         Section 10.13     Construction.................................................................21
</Table>

Schedules

Schedule I        ACC Markets
Schedule II       Comparable Markets
Schedule 2.1      Construction Plan
Schedule 2.3      Network Performance Standards
Schedule 2.4      Core Features and Services

<PAGE>

                             GSM OPERATING AGREEMENT

         GSM Operating Agreement, dated as of July 11, 2003, between AT&T
Wireless Services, Inc., a Delaware corporation ("AWS"), and American Cellular
Corporation, a Delaware corporation ("ACC").

         WHEREAS, in order to induce AWS to enter into the GSM Roaming Agreement
(as defined below), ACC has agreed to construct and operate GSM/GPRS Systems (as
defined below) to provide GSM/GPRS roaming services to customers of AWS in the
ACC Markets (as defined below) in accordance with the terms of this Agreement.

         NOW, THEREFORE, the parties hereby agree as follows:

                                    ARTICLE 1
                                   DEFINITIONS

         "3GPP" means Third Generation Partnership Project.

         "ACC" is defined in the preamble.

         "ACC GSM Systems" is defined in Section 2.1.

         "ACC Indemnified Party" is defined in Section 9.2.

         "ACC Markets" means the markets listed on Schedule I.

         "ACC TDMA Systems" means TDMA Systems owned by ACC or its affiliates.

         An "affiliate" of, or person "affiliated" with, a specified person, is
a person that directly, or indirectly through one or more intermediaries,
controls or is controlled by, or is under common control with, the person
specified.

         "AWS" is defined in the preamble.

         "AWS Indemnified Party" is defined in Section 9.1.

         "AWS TDMA Systems" means TDMA Systems owned by AWS or its affiliates.

         "AWS GSM Systems" means GSM/GPRS Systems owned by AWS or its
affiliates.

         "Change of Control of AWS" means (i) any circumstance, event or
transaction following which any person or group (as such term is used in
Sections 13(d) and 14(d) of the Exchange Act and the regulations thereunder) is
the "beneficial owner" (as such term is used in Rules 13d-3, 13d-5 or 16a-1
under the Exchange Act) of more than 50% of the voting power of the Voting
Securities of AWS (on a fully diluted basis, treating Equity Interests of AWS
issuable upon the conversion, exchange or exercise of convertible or
exchangeable securities, or other rights to acquire Equity Interests, as issued
and outstanding) or otherwise has the power, acting alone, to control AWS; or
(ii) the sale of

<PAGE>

all or substantially all of AWS's stock, business or assets (including through a
merger or otherwise).

         *

         "Claim" is defined in Section 9.3(a).

         "Comparable ACC Market" means, with respect to any AWS market set forth
on Schedule II, the ACC Market(s) set forth opposite such AWS market on Schedule
II.

         "Comparable AWS Market" means, with respect to any ACC Market set forth
on Schedule II, the AWS market(s) set forth opposite such ACC Market on Schedule
II.

         "Competitive Services" is defined in Section 4.1(a).

         "Competitive Systems" is defined in Section 4.2(a).

         "Competitive Transactions" is defined in Section 4.2(a).

         "control" (including the terms controlling, controlled by and under
common control with) means the possession, direct or indirect, of the power to
direct or cause the direction of the management and policies of a person,
whether through the ownership of voting securities, by contract, or otherwise.

         "DCC" means Dobson Communications Corporation.

         "Dispute" is defined in paragraph (a) of Article 8.

         "Dispute Notice" is defined in paragraph (c) of Article 8.

         "EDGE" means Enhanced Data for GSM Evolution, a wireless communications
technology based on GSM and defined by the relevant ETSI or 3GPP standards.

         "EDGE Deployment Percentage" means, with respect to any ACC Market or
AWS market listed on Schedule II, a fraction the numerator of which is the
number of cell sites of ACC or AWS, as applicable, in such market in which EDGE
technology has been deployed and the denominator of which is the number of cell
sites of ACC or AWS, as applicable, in such market in which GSM technology has
been (or, in the case of ACC, is then required in accordance with Schedule 2.1
to be) deployed.

         "EDGE Deployment Reports" has the meaning set forth in Section 3.1.

         "Equity Interests" means capital stock, partnership interests, limited
liability company interests or other ownership or beneficial interests of any
person.

         "ETSI" means the European Telecommunications Standardisation Institute.

----------

* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

                                       2
<PAGE>

         "Exchange Act" means the Securities Exchange Act of 1934, as amended.

         "Fair Market Value" means, with respect to any asset, as of the date of
determination, the cash price at which a willing seller would sell and a willing
buyer would buy such asset in a transaction negotiated at arm's length, each
being apprised of and considering all relevant facts, circumstances and factors,
and neither acting under compulsion, with the parties being unaffiliated third
parties acting without time constraints.

         "Force Majeure Event" has the meaning set forth in Section 6.7.

         "GPRS" means General Packet Radio Service, a wireless communications
technology based on GSM and defined by the relevant ETSI or 3GPP standards,
including EDGE if EDGE is implemented by ACC in accordance with Section 3.1.

         "GSM" means Global System for Mobile communication, a wireless
communications technology defined by the relevant ETSI or 3GPP standards.

         "GSM Covered Pops" means (i) with respect to any Comparable AWS
Markets, as of any date of determination, the number of Pops then served by AWS
GSM Systems in such Markets, and (ii) with respect to any Comparable ACC
Markets, as of any date of determination, the number of Pops then served by ACC
GSM Systems in such Markets.

         "GSM/GPRS System" means a mobile wireless system using technology that
combines GSM for voice communications and GPRS for data communications.

         "GSM Roaming Agreement" means the Roaming Agreement for GSM/GPRS of
even date herewith between AWS and ACC.

         "Indemnified Person" is defined in Section 9.3(a).

         "Indemnifying Person" is defined in Section 9.3(a).

         "Licensed Pops" means, with respect to any person in any market, Pops
covered by any FCC license authorizing such person to provide mobile wireless
communications services in such market.

         "Losses" is defined in Section 9.1.

         "Major Competing Carrier" means Cingular, Sprint Corporation, Verizon
Wireless, T-Mobile USA, Inc. and Nextel Communications, Inc. and their
respective successors, and any joint venture or other combination of their
respective assets or businesses.

         "New Technology" means UMTS and any other wireless hardware and/or
software technology other than TDMA, GSM, GPRS or EDGE.

                                       3
<PAGE>

         "Offering Memorandum" means the Offering Memorandum, Solicitation of
Consents and Votes, Plan of Reorganization, Disclosure Statement and Ballot
issued by ACC and DCC on July 14, 2003.

         "Overlap Markets" means those portions of the ACC Markets in which,
after giving effect to a Competitive Transaction, the Surviving Entity or its
controlled affiliates own, manage, operate or control Competitive Systems that
provide mobile wireless communications services.

         "Overlap Pops" means the Licensed Pops of ACC in any Overlap Markets.

         "person" means an individual, a government or governmental subdivision
or agency, and any legal or commercial entity.

         "Pops" means, with respect to any licensed area, the residents of such
area based on the most recent publication by Claritas Inc.

         "Response" is defined in paragraph (c) of Article 8.

         "Restructuring" is defined in the Offering Memorandum.

         "Section 7.3(b) Event" means (i) any circumstance, event or transaction
following which a Major Competing Carrier, alone or as part of a group (as such
term is used in Section 13(d) and 14(d) of the Exchange Act and the regulations
thereunder), is the "beneficial owner" (as such term is used in Rules 13D-3,
13D-5 or 16A-1 under the Exchange Act) of more than 50% of the voting power of
the Voting Securities of ACC (on a fully diluted basis, treating Equity
Interests of ACC issuable upon the conversion, exchange or exercise of
convertible or exchangeable securities, or other rights to acquire Equity
Interests, as issued and outstanding) or otherwise has the power, acting alone,
to control ACC; or (ii) the sale of all or substantially all of ACC's stock,
business or assets (including through a merger or otherwise) to a Major
Competing Carrier. If ACC is then managed by, or has been merged or consolidated
with, or has become a subsidiary of, DCC or its controlled affiliates, a Section
7.3(b) Event shall include (i) any circumstance, event or transaction following
which a Major Competing Carrier, alone or as part of a group (as such term is
used in Section 13(d) and 14(d) of the Exchange Act and the regulations
thereunder), is the "beneficial owner" (as such term is used in Rules 13D-3,
13D-5 or 16A-1 under the Exchange Act) of more than 50% of the voting power of
the Voting Securities of DCC (on a fully diluted basis, treating Equity
Interests of DCC issuable upon conversion, exchange or exercise of convertible
or exchangeable securities, or other rights to acquire Equity Interests, as
issued and outstanding) or otherwise as the power, acting alone, to control DCC;
or (ii) the sale of all or substantially all of DCC's stock, business or assets
(including through a merger or otherwise) to a Major Competing Carrier.

         "Senior Party Representatives" is defined in paragraph (b) of Article
8.

         A "subsidiary" of a specified person is an affiliate controlled by such
person directly, or indirectly through one or more intermediaries.

                                       4
<PAGE>

         "Surviving Entity" means, with respect to a Competitive Transaction,
the surviving entity or other person that as a result of such Competitive
Transaction owns, manages, operates or controls Competitive Systems.

         "TDMA" means Time Division Multiple Access, a wireless communications
technology defined by the relevant Telecommunications Industry Association
standard. For the avoidance of doubt, TDMA does not include GSM, GPRS, EDGE,
UMTS or any other wireless communications technology.

         "TDMA Covered Pops" means (i) with respect to any Comparable AWS
Markets, as of any date of determination, the number of Pops then served by AWS
TDMA Systems in such Markets, and (ii) with respect to any Comparable ACC
Markets, as of any date of determination, the number of Pops then served by ACC
TDMA Systems in such Markets.

         "TDMA System" means a mobile wireless system using TDMA technology.

         "Term" is defined in Section 7.1.

         "Transaction Pops" means the Licensed Pops in the markets that are
acquired by the Surviving Entity in a Competitive Transaction.

         "UMTS" means Universal Mobile Telecommunications Service, a wireless
communications technology based on GSM and under development by 3GPP.

         "User Interface" means the process, functional commands, and look and
feel by which a mobile wireless service subscriber operates and utilizes the
mobile wireless services and service features provided by a GSM/GPRS System,
including the sequence and detail of specific commands or service codes, the
detailed operation and response of subscriber equipment to the sequence of keys
pressed to effect subscriber equipment function, the response of subscriber
equipment to the activation of these keys or signals or data from the GSM/GPRS
System, the manner in which information is displayed on the screen of subscriber
equipment, and the use of announcement tones and messages.

         "Voting Securities" means equity securities of a person having the
right to vote generally in the election of the directors (or persons performing
equivalent functions) of such person.

                                    ARTICLE 2
                                   GSM SYSTEMS

         Section 2.1 Construction

         ACC shall construct and operate facilities-based mobile wireless
telecommunications systems using EDGE-compatible GSM and GPRS technology (the
"ACC GSM Systems") in the ACC Markets in accordance with the construction plan
attached as Schedule 2.1. If ACC fails to construct any ACC GSM System in
substantial compliance with such construction plan, and as a result AWS
terminates its obligations

                                       5
<PAGE>

under Article 4 with respect to any ACC Market in accordance with Section 7.2.,
AWS and its affiliates shall have the right, on commercially reasonable rates
and other terms, to co-locate GSM/GPRS telecommunications equipment on towers,
in shelters, on rooftops or at other facilities owned by ACC or its affiliates
in such ACC Market.

         Section 2.2 Interoperability

         ACC shall at all times cause the ACC GSM Systems in the ACC Markets to
be technologically compatible in all material respects (including with respect
to switch-to-switch call handoffs) with the AWS GSM Systems in the Comparable
AWS Markets. Without limiting the generality of the foregoing, ACC shall at all
times cause the ACC GSM Systems in the ACC Markets to use substantially the same
User Interface used in the AWS GSM Systems in the Comparable AWS Markets, so
that the User Interface of the relevant ACC GSM Systems shall not differ, in a
manner that shall be material to subscribers, from the User Interface of the
relevant AWS GSM Systems. AWS shall from time to time notify ACC of changes to
the User Interface or other elements of the AWS GSM Systems in the AWS markets
listed on Schedule II, and ACC shall promptly, and in no event later than 120
days after delivery of any such notice, or such longer period as shall
reasonably be required on account of delays caused by Force Majeure Events or as
the parties shall otherwise agree, implement such changes in the ACC GSM Systems
in the Comparable ACC Markets.

         Section 2.3 Network Performance Standards

         ACC shall at all times cause the ACC GSM Systems in the ACC Markets to
comply substantially with the network performance standards met by the AWS GSM
Systems in the Comparable AWS Markets. The initial network performance standards
for the ACC GSM Systems are set forth on Schedule 2.3. In any event, the
standards shall be limited by the measures of performance being achieved and
maintained by AWS in Comparable AWS Markets. AWS shall from time to time notify
ACC of new or modified network performance standards met by the AWS GSM Systems
in the AWS markets listed on Schedule II, and ACC shall promptly, and in no
event later than 120 days after delivery of any such notice, or such longer
period as shall reasonably be required on account of delays caused by Force
Majeure Events or as the parties shall otherwise agree, implement such changes
in the ACC GSM Systems in the Comparable ACC Markets. The support information
for AWS's compliance with these modified standards shall be provided to ACC.

         Section 2.4 Core Features and Services

         ACC shall at all times cause the ACC GSM Systems in the ACC Markets to
provide the core features and services provided by the AWS GSM Systems in the
Comparable AWS Markets. The initial core features and services for the ACC GSM
Systems are set forth on Schedule 2.4. AWS shall from time to time notify ACC of
new or modified core features or services provided to subscribers in the AWS
markets listed on Schedule II, and ACC shall promptly, and in no event later
than 120 days after delivery of any such notice, or such longer period as shall
reasonably be required on

                                       6
<PAGE>

account of delays caused by Force Majeure Events or as the parties shall
otherwise agree, implement such changes in the ACC GSM Systems in the Comparable
ACC Markets.

                                    ARTICLE 3
                            EDGE AND NEW TECHNOLOGIES

         Section 3.1 EDGE

         Promptly after AWS begins offering EDGE service in any of its markets
listed on Schedule II in connection with a nationwide launch that AWS expects to
complete within 90 days, AWS will give ACC notice thereof, and thereafter will
provide ACC with monthly reports ("EDGE Deployment Reports") of the EDGE
Deployment Percentage in each of the AWS markets listed on Schedule II. Within
90 days following the delivery of each EDGE Deployment Report, ACC shall deploy
EDGE technology, and provide EDGE service, in the ACC Markets such that the EDGE
Deployment Percentage in each ACC Market is equal to or greater than the EDGE
Deployment Percentage in the Comparable AWS Markets specified in such EDGE
Deployment Report. ACC shall provide AWS with evidence reasonably satisfactory
to AWS of ACC's deployment of EDGE in compliance with the preceding sentence.

         Section 3.2 New Technologies

         AWS will offer to ACC in writing the option of being the preferential
roaming provider for AWS in the ACC Markets with respect to mobile wireless
services using each New Technology that AWS deploys during the Term. ACC will
have 30 days to elect to exercise any such option, whereupon the parties will
promptly meet to discuss the terms and conditions of a new construction and
roaming agreement relating to the New Technology. If the parties are unable to
agree on terms within 30 days after the commencement of discussions, ACC will
have no further rights, and AWS will have no further obligations, with respect
to such New Technology or any technology subsequently adopted by AWS.

                                    ARTICLE 4
                               LIMITED EXCLUSIVITY

         Section 4.1 Limited Exclusivity

         (a) During the first three years of the Term and, if the parties agree
or ACC so elects in accordance with Article 8.1.1(b)(ii) of the GSM Roaming
Agreement, during the last two years of the Term, except as otherwise provided
herein, AWS shall not, and shall cause its controlled affiliates not to,
directly or indirectly, alone or jointly with any other person or entity,
acquire or hold an ownership interest in, manage, operate, control or otherwise
engage in, a business that provides or resells, or a license that facilitates or
enables the provision or resale of, facilities-based mobile wireless services
using GSM, GPRS and (subject to 3.1) EDGE on any spectrum in any ACC Market
other than the KY-04 RSA, KY-05 RSA, KY-06 RSA and KY-08 RSA markets (such
services being referred to herein as "Competitive Services").

                                       7
<PAGE>

         (b) Notwithstanding the provisions of paragraph (a) above, AWS and its
affiliates may:

                  (i) subject to the provisions of paragraph (c) below, acquire,
         hold, maintain and renew FCC licenses and mobile wireless
         telecommunications facilities, to the extent necessary or advisable to
         maintain and renew such licenses, including compliance with the
         construction requirements, and satisfaction with the substantial
         service requirement for license renewal expectancy, of applicable FCC
         rules, and ACC shall cooperate with AWS, at AWS's request and expense,
         in connection therewith;

                  (ii) acquire and hold ownership interests in any person (x)
         that is not an affiliate of AWS, (y) to which AWS and its controlled
         affiliates do not direct roaming traffic (in respect of Competitive
         Services) on a priority basis with respect to ACC and its subsidiaries
         and (z) that does not market Competitive Services (on a primary basis,
         tagline basis or otherwise) under the "AT&T Wireless" brand or any
         similar or successor brand used by AWS or its affiliates on a
         substantially national basis; and

                  (iii) enter into a Competitive Transaction in accordance with
         Section 4.2.

         (c) AWS will give ACC reasonable advance written notice of deadlines
relating to construction and substantial service requirements with respect each
license held by AWS or its subsidiaries in the ACC Markets. ACC will have 15
days from receipt of any such notice to elect in writing to comply with such
requirements on behalf of AWS. If ACC makes such election with respect to a
license, the parties shall promptly execute and deliver mutually satisfactory
agreements providing for such compliance, in substantially the form of
comparable agreements that previously have been entered into by the parties or
their respective affiliates (including DCC in the case of ACC).

         Section 4.2 Competitive Transactions

         (a) Section 4.1 shall not prohibit AWS and its affiliates from entering
into a merger, consolidation, joint venture, purchase, investment, exchange or
sale of assets, issuance or sale of securities, or other business combination
transaction, with a person unaffiliated with AWS, that results in the Surviving
Entity or its controlled affiliates owning, managing, operating or controlling
systems providing Competitive Services in one or more of the ACC Markets
("Competitive Systems") (any such transaction, subject to the next sentence,
being referred to as a "Competitive Transaction"); provided, that (i) (A) upon
consummation of the Competitive Transaction, the number of Overlap Pops is less
than * of the number of Transaction Pops or (B) within 180 days following
consummation of the Competitive Transaction, the Surviving Entity and its
controlled affiliates shall have ceased to own, manage, operate or control
sufficient Competitive Systems such that the number of Overlap Pops is then less
than * of the number of Transaction Pops and (ii) AWS complies with the
provisions of paragraph (b) below. For

*  Confidential information has been omitted and filed separately with the
   Securities and Exchange Commission.

                                       8
<PAGE>

the avoidance of doubt and notwithstanding the foregoing, any transaction
permitted by Section 4.1(b)(ii) shall not be considered a Competitive
Transaction.

         (b) AWS will notify ACC of the execution of definitive agreements
relating to a Competitive Transaction and will offer to sell, or (if AWS is not
the Surviving Entity) to arrange for the Surviving Entity to sell, any or all of
the Competitive Systems to ACC at their Fair Market Value (the "ACC Purchase").
If any dispute arises as to the Fair Market Value such dispute shall be resolved
in accordance with Article 8. ACC shall have 30 days from the receipt of such
offer to elect to purchase any or all of the Competitive Systems. If ACC elects
to purchase one or more of the Competitive Systems within such 30-day period,
ACC will promptly enter into a purchase and sale agreement on commercially
reasonable terms with AWS or the Surviving Entity. The consummation of the ACC
Purchase will be scheduled to occur within a reasonable period of time following
the consummation of the Competitive Transaction. If ACC notifies AWS or the
Surviving Entity within such 30-day period that ACC would have elected to
purchase one or more of the Competitive Systems but for applicable FCC
regulations prohibiting such purchase (such competitive systems, the "FCC
Affected Systems"), AWS or the Surviving Entity will use commercially reasonable
efforts to sell such Competitive Systems to a third party at their Fair Market
Value. AWS shall cease to be subject to the provisions of Articles 4 and 5 with
respect to any Competitive Systems acquired pursuant to a Competitive
Transaction if (x) ACC does not elect to purchase such Competitive Systems
within such 30-day period or (y) ACC fails to purchase such Competitive Systems
in breach of the applicable purchase and sale agreement or (z) in the case of
FCC Affected Systems only, AWS or the Surviving Entity is unable to agree with
an unaffiliated third party to sell such FCC Affected Systems within 180 days
after the expiration of such 30-day period, and ACC shall cease to be subject to
the provisions of Articles 2 and 3 with respect to those portions of the ACC
Markets in which such Competitive Systems are located. Following the
consummation of the Competitive Transaction and pending the disposition of any
Competitive Systems in accordance with the foregoing provisions of this
paragraph (b), AWS shall be relieved of its obligations under Articles 4 and 5,
and ACC shall be relieved of its obligations under Articles 2 and 3, with
respect to such Competitive Systems and those portions of the ACC Markets in
which such Competitive Systems are located. AWS will not expand, within the ACC
Markets, the footprint of any Competitive System that it retains.

         Section 4.3 Limitations on Relief

         Notwithstanding any provision hereof to the contrary, ACC shall not be
entitled to injunctive relief with respect to that portion of any proposed
Competitive Transaction, or any other provisions of Section 4.1(b), that relate
to service areas located outside the ACC Markets, and ACC's only remedy in
respect of such provisions or portion of the proposed Competitive Transaction
shall be to seek monetary damages from AWS. To the extent that any proposed
Competitive Transaction or other provisions of Section 4.1(b) relate to service
areas located within the ACC Markets, without prejudice to its other remedies,
ACC shall be entitled to injunctive relief with respect to such provisions or
portion of the proposed Competitive Transaction.

                                       9
<PAGE>

                                    ARTICLE 5
                               ROAMING PREFERENCE

         Section 5.1 Roaming Preference

         (a) AWS, in its capacity as HPMN Operator (as defined in the GSM
Roaming Agreement), shall cause substantially all of its customers, when roaming
in any ACC Market, to normally seek GSM roaming service and GPRS roaming service
from ACC prior to seeking GSM roaming service or GPRS roaming service from any
other carrier; provided, that ACC shall have constructed and shall be operating
a GSM System in such ACC Market in substantial compliance with the provisions of
Article 2, and is otherwise in substantial compliance with the provisions of the
GSM Roaming Agreement. ACC will be the sole provider of toll services for all of
AWS's TDMA, GSM and GPRS roaming traffic in the ACC Markets, and AWS will not
redirect or cause the redirection of such toll services to another person.

         (b) ACC, in its capacity as HPMN Operator, shall cause substantially
all of its customers, when roaming in any AWS market, to normally seek GSM
roaming service and GPRS roaming service from AWS prior to seeking GSM roaming
service or GPRS roaming service from any other carrier; provided, that AWS is in
substantial compliance with the provisions of the GSM Roaming Agreement.

         Section 5.2 *

                                    ARTICLE 6
                                OTHER AGREEMENTS

         Section 6.1 Further Assurances

         Each party will execute and deliver such further documents and take
such further actions as the other party may reasonably request consistent with
the provisions hereof in order to effect the intent and purposes of this
Agreement.

         Section 6.2 Reporting Obligations

         ACC and AWS shall provide the other party with quarterly reports on the
status of construction and operating metrics of the ACC GSM Systems in the ACC
Markets and the AWS GSM Systems in the Comparable AWS Markets, respectively, and
with such other reports as the other party may reasonably request and which are
reports regularly prepared by such party or may be prepared without material
cost or expense.

----------

* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

                                       10
<PAGE>

         Section 6.3 Test Procedures

         The parties shall use reasonable best efforts to complete, as soon as
practicable, all test procedures necessary in order to enable the parties to
provide Services (as defined in the GSM Roaming Agreement).

         Section 6.4 Funding

         ACC is solely responsible for financing all costs and expenses relating
to the performance of its obligations under this Agreement. Neither AWS nor any
of its affiliates shall have any responsibility for providing any financing or
assisting ACC in obtaining any financing.

         Section 6.5 Compliance with Law

         Each party will comply in all material respects with the FCC Rules and
all other applicable laws, rules and regulations in performing its obligations
under this Agreement.

         Section 6.6 Confidentiality

         (a) ACC and AWS agree that all aspects of the contents of this
Agreement shall be treated as confidential and that no information in respect of
the content of this Agreement shall be disclosed without the prior written
consent of both ACC and AWS except (i) as required by law or legal process, (ii)
to a party's employees who need to know same and such party's attorneys,
advisors, representatives, agents, lenders, insurers, and current or potential
investors (collectively, "Representatives"), (iii) in the Offering Memorandum
and such other disclosure documents as, in the good faith judgment of ACC's
outside legal counsel, are necessary to effect the Restructuring
("Reorganization Disclosure") and (iv) as necessary to implement this Agreement
and inform customers.

         (b) ACC and AWS hereby agree to treat all information exchanged between
them in connection with this Agreement (hereinafter referred to as
"Information") as confidential and agree not to disclose such Information in any
manner whatsoever, in whole or in part except as provided in this Section 6.6.
The other party shall not use any Information other than in connection with (i)
the discussions between them and any transactions resulting therefrom, (ii) for
the purpose of obtaining funds or insurance or in connection with any bona fide
business transaction, in which case the disclosing party shall advise the
lenders or insurance companies of such party's confidentiality obligation under
this Section 6.6 before disclosing the Information and (iii) Reorganization
Disclosure. Each party shall be liable in accordance with Article 9 to the other
party in respect of any unauthorized disclosure of Information made by its
Representatives to whom it has disclosed Information.

         (c) In addition to the above, Information may be transmitted to
governmental, judicial or regulatory authorities, as may be required by any
governmental, judicial or regulatory authority, provided, that the party
transmitting such Information gives the other party reasonable notice and
opportunity to seek confidential treatment of such Information by any such
authority.

                                       11
<PAGE>

         (d) For the purposes of this Agreement, Information shall not be
considered to be confidential if such Information is:

                           (A) in or passed into the public domain other than by
                  breach of this Article;

                           (B) known to a receiving party prior to the
                  disclosure by a disclosing party;

                           (C) disclosed to a receiving party without
                  restriction by a third party having the full right to
                  disclose; or

                           (D) independently developed by a receiving party to
                  whom no disclosure of confidential Information relevant to
                  such Information has been made.

         (e) This Section 6.6 shall survive the termination of this Agreement
for a period of two years.

         Section 6.7 Force Majeure

         (a) Non-performance or defective performance of either party's
obligations pursuant to this Agreement or delay in performing same shall not
constitute a breach of this Agreement to the extent, and for as long as, it is
due to reasons outside such party's control (in each case a "Force Majeure
Event"), including, but not being limited to, governmental action, or
requirement of regulatory authority, acts of God, terrorism, riots, revolution,
lockouts, strikes, shortage of transportation, war, rebellion or other military
action, fire, flood, explosion, sabotage, nuclear incidents, earthquakes,
lightning, storms, sinkholes, epidemics, delays or non-performance of suppliers
or subcontractors, natural catastrophes, or any other unforeseeable obstacles
that a party is not able to overcome with reasonable efforts. The party
prevented from fulfilling its obligations shall on becoming aware of such Force
Majeure Event inform the other party in writing of such Force Majeure Event as
soon as possible. If the Force Majeure Event continues for more than six (6)
consecutive months, either party shall have the right to terminate the Agreement
with immediate effect by written notice.

         (b) If the affected party fails to inform the other party of the
occurrence of a Force Majeure Event in accordance with Section 6.7(a) above,
then such party thereafter shall not be entitled to refer to such event as force
majeure as a reason for non-fulfillment, to the extent such party is
disadvantaged by such delay. This obligation does not apply if the Force Majeure
Event is known by both parties or the affected party is unable to inform the
other party due to the Force Majeure Event.

                                       12
<PAGE>

                                    ARTICLE 7
                              TERM AND TERMINATION

         Section 7.1 Term

         The term of this Agreement (the "Term") shall commence on the date
hereof and, unless earlier terminated in accordance with this Article 7, shall
expire on the fifth anniversary of the date hereof.

         Section 7.2 Automatic Termination

         This Agreement shall terminate automatically, without the necessity of
notice, on November 30, 2003, unless on or prior to such date (i) the
Restructuring has been completed substantially in accordance with terms
described in the Offering Memorandum and (ii) if the Restructuring shall have
been effected pursuant to the Plan (as defined in the Offering Memorandum), this
Agreement and/or the GSM Roaming Agreement shall, if subject to the approval of
a Bankruptcy Court, have been approved by order of the Bankruptcy Court, without
the imposition of any condition that would adversely affect AWS or its business
(including this Agreement and the GSM Roaming Agreement) in any material respect
and (iii) the Second Amended and Restated Limited Liability Company Agreement,
dated as of February 25, 2000, by and between AT&T Wireless Services JV Co.
("AWS Sub") and Dobson JV Company ("DCC Sub") shall have terminated, and AWS Sub
shall have withdrawn as a member of ACC, all in accordance with the Termination
and Withdrawal Agreement of even date herewith between AWS Sub and DCC Sub and
(iv) the holders of ACC's 9-1/2% Senior Subordinated Notes due 2009 (the
"Notes") shall have released AWS and its affiliates from all claims arising from
ownership of the Notes, pursuant to documentation in form and substance
reasonably satisfactory to AWS (it being agreed that the condition set forth in
this clause (iv) shall be satisfied if AWS and its affiliates are released as
contemplated by paragraph 4 on page 2 of the broker's letter to beneficial
owners of the Notes, or pursuant to Article IX of the Plan, in each case in the
form attached to the Offering Memorandum).

         Section 7.3 Termination by AWS

         So long as no material breach by AWS under this Agreement or the GSM
Roaming Agreement has occurred and is continuing:

         (a) AWS may terminate its obligations under Articles 3, 4 and 5, and
Sections 6.2 and 6.3 (without affecting ACC's rights with respect to mobile
wireless services using TDMA), on five days' notice to ACC, upon a material
breach of ACC's obligations under (i) Section 2.2, 2.3 or 2.4, which breach
remains uncured 90 days after ACC has received written notice thereof or (ii)
Section 2.1 or 3.1, which breach remains uncured 30 days after ACC has received
written notice thereof.

         (b) AWS may terminate its obligations under Articles 4 and 5, on 90
days' notice to ACC, in the event of a Section 7.3(b) Event.

                                       13
<PAGE>

         Section 7.4 Termination by ACC

         So long as no material breach by ACC under this Agreement or the GSM
Roaming Agreement has occurred and is continuing (except such a breach shall not
affect ACC's termination right under Section 7.4(b)):

         (a) ACC may terminate its obligations under Articles 2, 3, 5, and
Sections 6.2, 6.3 and 6.4, on five days' notice to AWS, with respect to mobile
wireless services using any technology, upon a material breach of AWS's
obligations under Article 4 or 5 with respect to such technology, which breach
remains uncured 90 days after AWS has received written notice thereof.

         (b) ACC may terminate its obligations under Articles 2, 3 and 5 on 90
days' written notice to AWS, with respect to mobile wireless services using any
technology, in the event of a Change of Control of AWS if the acquiring company
discontinues, or announces plans to discontinue, prior to expiration of the
Term, supporting or selling such technology.

         (c) ACC may terminate its obligations under Articles 2, 3 and 5 on five
days' written notice to AWS, with respect to mobile wireless services using GSM,
GPRS and/or EDGE technology in any ACC Market, in the event that AWS terminates
its obligations under Section 4 or 5 above with respect to such technology in
such ACC Market, unless such termination by AWS is pursuant to Section 7.3(b) or
Section 8.1.1(b)(iii) of the GSM Roaming Agreement.

         Section 7.5 Effect of Termination

         Termination pursuant to Section 7.2, 7.3 or 7.4 shall not relieve any
party of any liability which at the time of termination has already accrued to
such party or which thereafter may accrue in respect of any act or omission
prior to such termination, nor shall any such termination affect in any way the
survival of any right, duty or obligation of any party which is expressly stated
elsewhere in this Agreement to survive termination hereof. The provisions of
Articles 7, 8, 9 and 10 shall survive the termination of this Agreement for any
reason.

                                    ARTICLE 8
                               DISPUTE RESOLUTION

         (a) If a dispute arises out of or relating to this Agreement, or the
transactions contemplated hereby, or the construction, interpretation,
performance, breach, termination, enforceability or validity thereof, whether
such claim is based on rights, privileges or interests recognized by or based
upon contract, tort, fraud, misrepresentation, statute, common law or any other
legal or equitable theory, and whether such claim existed prior to or arises on
or after the date hereof (a "Dispute"), the dispute resolution processes set
forth in this Article 8 shall govern the resolution of such dispute.

                                       14
<PAGE>

         (b) If a Dispute cannot be resolved by the executives having primary
managerial responsibility for the matter to which the Dispute pertains, the
parties shall attempt in good faith to resolve such Dispute promptly by
negotiation between executives who have authority to settle the Dispute and who
are at the level of the executives who have negotiated this Agreement ("Senior
Party Representatives").

         (c) A party may provide any other party notice (a "Dispute Notice") of
any Dispute that has not been resolved in the normal course of business. Within
ten business days after delivery of the Dispute Notice, the receiving party
shall submit to each other party a response (the "Response"). The Dispute Notice
and the Response shall each include (a) a statement setting forth the position
of the party providing such notice and a summary of arguments supporting such
position, and (b) the name and title of such party's Senior Party Representative
and any other Persons who will accompany the Senior Party Representative at the
meeting at which the parties will attempt to settle the Dispute. Within 30
business days after delivery of the Dispute Notice, the Senior Party
Representatives of the parties shall meet at a mutually acceptable time and
place, and thereafter as often as they reasonably deem necessary, to attempt to
resolve the Dispute. All reasonable requests for information made by one party
to another will be honored.

         (d) If the Dispute has not been resolved within 50 business days after
delivery of the Dispute Notice, or if the parties fail to meet within 30
business days after delivery of the Dispute Notice, any party may initiate
arbitration of the Dispute as provided below. If no party initiates arbitration
within 60 business days after delivery of the Dispute Notice, then the parties
shall automatically be released from any and all liability for the Dispute.

         (e) All negotiations pursuant to this section shall be treated as
compromise and settlement negotiations. Nothing said or disclosed, nor any
document produced, in the course of such negotiations that is not otherwise
independently discoverable shall be offered or received as evidence or used for
impeachment or for any other purpose in any current or future arbitration. The
parties agree that all communications and negotiations between the parties
during the dispute resolution process, any settlements agreed upon during the
dispute resolution process and any information regarding the other party
obtained during the dispute resolution process (that are not already public
knowledge) are confidential and may be disclosed only to employees and agents of
the parties who shall have a "need to know" the information and who shall have
been made aware of the confidentiality obligations set forth in this Article 8,
unless the party is required by law to disclose such information.

         (f) If the Dispute is not resolved as provided in paragraphs (b)
through (d) above, then any party may initiate arbitration proceedings by
providing each other party notice of such initiation of arbitration. The Dispute
shall then be settled by arbitration in accordance with the CPR Non-Administered
Arbitration Rules in effect on the date hereof, by a panel of three arbitrators.
Each Party shall select one of the three arbitrators and the two arbitrators so
chosen shall select the third arbitrator. The arbitrators shall be governed by
the United States Arbitration Act, 9 U.S.C. Sections 1-16, and judgment upon the
award rendered by the arbitrators may be entered by any court having

                                       15
<PAGE>

jurisdiction thereof. The place of arbitration shall be chosen by the three
arbitrators. The arbitrators shall be empowered to award only damages that are
recoverable under the provisions of Article 9, and each party hereby irrevocably
waives any right to recover any other damages with respect to any Dispute. The
arbitrators shall not order pre-hearing discovery of documents or the taking of
depositions, although the arbitrators may compel the attendance of witnesses and
the production of documents at the hearing to the extent permitted by the CPR
Non-Administered Arbitration Rules.

         (g) If a party does not provide a Dispute Notice within one year
following the time the party first knows of the existence of the acts or
omissions that give rise to the Dispute, the party shall be forever estopped
from asserting the Dispute against any other party.

         (h) The reasonable out-of-pocket costs (including reasonable attorneys'
fees and expenses) of the prevailing party and the fees of the arbitrators in
any arbitration proceeding pursuant to this Article 8 shall be paid by the other
party. The arbitrators shall determine which party is the prevailing party for
purposes of this paragraph, and shall include such determination in their award.
If the arbitrators determine that neither party is the prevailing party for
purposes of this paragraph, then each party shall bear its own costs and
expenses, including attorneys' fees and expenses, and the parties shall share
equally the fees of the arbitrators.

         (i) Notwithstanding the foregoing, but subject to Section 4.3, nothing
in this Agreement shall preclude the parties from seeking injunctive or other
equitable relief from a court with regard to any breach of this Agreement.

                                    ARTICLE 9
                                 INDEMNIFICATION

         Section 9.1 Indemnification by ACC

         ACC shall indemnify and hold harmless AWS and its affiliates, and their
respective members, managers, officers, employees, and agents and/or the legal
representatives of any of them (each, a "AWS Indemnified Party"), against all
liabilities and expenses (including amounts paid in satisfaction of judgments,
in compromise, as fines and penalties, and as counsel fees) (collectively
"Losses") incurred by them that arise out of or result from (a) any
representation or warranty of ACC contained in this Agreement being untrue in
any material respect as of the date on which it was made or (b) any material
default by ACC or any of its affiliate in the performance of their respective
obligations under this Agreement, except to the extent that any such Losses
arise out of or result from the gross negligence or willful misconduct of AWS.

         Section 9.2 Indemnification by AWS

         AWS shall indemnify and hold harmless, ACC, its affiliates, and its
members, managers, officers, employees, and agents and/or the legal
representatives of any of them (each, a "ACC Indemnified Party"), against all
Losses incurred by them that arise out of or result from (a) any representation
or warranty of AWS contained in this Agreement

                                       16
<PAGE>

being untrue in any material respect as of the date on which it was made or (b)
any material default by AWS or any of its affiliates in the performance of their
respective obligations under this Agreement, except to the extent that any such
Losses arise out of or result from the gross negligence or willful misconduct of
ACC.

         Section 9.3 Procedures

         (a) The terms of this Section 9.3 shall apply to any claim (a "Claim")
for indemnification under the terms of Sections 9.1 and 9.2. The applicable AWS
Indemnified Party or ACC Indemnified Party (each, an "Indemnified Party") shall
give prompt written notice of such Claim to the indemnifying party hereunder
(the "Indemnifying Party"), which may assume the defense thereof, provided that
any delay or failure to so notify the Indemnifying Party shall relieve the
Indemnifying Party of its obligations hereunder only to the extent, if at all,
that it is prejudiced by reason of such delay or failure: The Indemnified Party
shall have the right to approve any counsel selected by the Indemnifying Party
(Friedman Kaplan Seiler & Adelman LLP and Edwards & Angell, LLP being deemed
acceptable) and to approve the terms of any proposed settlement (unless such
settlement provides only, as to the Indemnified Party, the payment of money
damages actually paid by the Indemnifying Party). The Indemnifying Party shall
advance to the Indemnified Party any of its reasonable attorneys' fees and other
costs and expenses incurred in connection with the defense of any such action or
proceeding. Each Indemnified Party shall agree in writing prior to any such
advancement, that in the event he or it receives any such advance, such
Indemnified Party shall reimburse the Indemnifying Party for such fees, costs,
and expenses to the extent that it shall be determined that he or it was not
entitled to indemnification under this Article 9. The right accruing to an
Indemnified Party under this Article 9 shall not exclude any other right to
which it or he may be lawfully entitled. Notwithstanding any of the foregoing to
the contrary, the provisions of this Article 9 shall not be construed so as to
provide for the indemnification of any Indemnified Party for any liability to
the extent (but only to the extent) that such indemnification would be in
violation of applicable law or such liability may not be waived, modified, or
limited under applicable law, but shall be construed so as to effectuate the
provisions of this Article 9 to the fullest extent permitted by law.

         (b) In the event that the Indemnifying Party undertakes the defense of
a Claim, the Indemnifying Party will keep the Indemnified Party advised as to
all material developments in connection with such Claim, including, but not
limited to, promptly furnishing to the Indemnified Party copies of all material
documents filed or served in connection therewith.

         (c) In the event that the Indemnifying Party, within ten business days
after receiving written notice of any such Claim, fails to assume the defense
thereof, the Indemnified Party shall have the right, subject to the Indemnifying
Party's right to assume the defense pursuant to the provisions of this Article
9, to undertake the defense, compromise or settlement of such Claim for the
account of the Indemnifying Party.

                                       17
<PAGE>

         (d) Notwithstanding anything herein to the contrary, neither party
shall have any liability hereunder for consequential or punitive damages, even
if apprised of the possibility of such damages.

                                   ARTICLE 10
                                  MISCELLANEOUS

         Section 10.1 Entire Agreement

         This Agreement and the GSM Roaming Agreement, together with any
annexes, schedules and exhibits hereto and thereto, contain the entire agreement
and understanding of the parties relating to the subject matter hereof and
thereof, and supersede all prior negotiations, proposals, offers, agreements and
understandings (written or oral) relating to such subject matter.

         Section 10.2 Amendment; Waiver

         Neither this Agreement nor any provision hereof may be amended or
modified except in a writing signed by each of the parties. No failure or delay
of any party in exercising any power or right hereunder shall operate as a
waiver thereof, nor shall any single or partial exercise of any such right or
power, or any abandonment or discontinuance of steps to enforce any such right
or power, preclude any other further exercise thereof or the exercise of any
other right or power. No waiver by any party of any departure by any other party
from any provision of this Agreement shall be effective unless the same shall be
in a writing signed by the party against which enforcement of such waiver or
consent is sought, and then such waiver or consent shall be effective only in
the specific instance and for the specific purpose for which it was given. No
notice or similar communication by any party to another shall entitle such other
party to any other or further notice or similar communication in similar or
other circumstances, except as specifically provided herein.

         Section 10.3 Specific Performance

         Subject to Section 4.3, the parties acknowledge that money damages may
not be an adequate remedy for violations of this Agreement and that any party
may, in its sole discretion, in an arbitration or a court of competent
jurisdiction, to the extent permitted hereunder, apply for specific performance
or injunctive or other relief as such arbitration or court may deem just and
proper in order to enforce this Agreement or to prevent violation hereof and, to
the extent permitted by applicable law, each party waives any objection to the
imposition of such relief.

         Section 10.4 Remedies Cumulative

         All rights, powers and remedies provided under this Agreement or
otherwise available in respect hereof at law or in equity shall, unless
otherwise specifically provided herein, be cumulative and not alternative, and
the exercise or beginning of the exercise of any right, power or remedy thereof
by a party shall not preclude the simultaneous or later exercise of any other
such right, power or remedy by such party.

                                       18
<PAGE>

         Section 10.5 Successors and Assigns

         This Agreement shall be binding upon and shall inure to the benefit of
the parties and their respective successors and permitted assigns. No party may
assign its rights or delegate its duties under this Agreement without the
written consent of the other party, except that ACC shall have the right to
transfer or assign this Agreement in whole to a Subsidiary of Dobson
Communications Corporation that directly or indirectly owns, operates and
controls wireless communications systems in the ACC Markets and does not own,
manage, operate or control any other wireless communications systems.

         Section 10.6 No Third Party Beneficiaries

         This Agreement is entered into solely for the benefit of the parties
and no person other than the parties, their respective successors and permitted
assigns, their affiliates to the extent expressly provided herein, and (to the
extent provided in Article 9) the persons entitled to indemnification pursuant
to Article 9, may exercise any right or enforce any obligation hereunder.

         Section 10.7 Further Assurances

         Each party will execute and deliver such further documents and take
such further actions as any other party may reasonably request consistent with
the provisions hereof in order to effect the intent and purposes of this
Agreement.

         Section 10.8 Notices

         All notices or other communications hereunder shall be in writing and
shall be deemed to have been duly given or made (i) upon delivery if delivered
personally (by courier service or otherwise) or (ii) upon confirmation of
dispatch if sent by facsimile transmission (which confirmation shall be
sufficient if shown on the journal produced by the facsimile machine used for
such transmission), and all legal process with regard hereto shall be validly
served when served in accordance with applicable law, in each case to the
applicable addresses set forth below (or such other address as the recipient may
specify in accordance with this Section):

                  If to ACC:

                           c/o Dobson Communications Corporation
                           14201 Wireless Way
                           Oklahoma City, OK 73134
                           Attention: General Counsel
                           Fax: (405) 529-8765

                  with a copy to:

                           Edwards & Angell, LLP
                           2800 Financial Plaza
                           Providence, RI 02903
                           Attention: David K. Duffell
                           Fax: (401) 276-6611

                                       19
<PAGE>

                  If to AWS:

                           AT&T Wireless Services, Inc.
                           7277 164th Avenue, NE
                           Redmond, WA 98052
                           Attention: Mark D. Bradner
                           Fax: (425) 580-8405

                  with a copy to:

                           Friedman Kaplan Seiler & Adelman LLP
                           1633 Broadway
                           New York, NY 10019
                           Fax: (212) 833-1250
                           Attention: Matthew S. Haiken

         Section 10.9 Governing Law

         This Agreement shall be governed by and construed in accordance with
the internal laws of the State of Delaware, without regard to principles of
conflicts of law.

         Section 10.10 Severability

         If any term of this Agreement or the application thereof to any party
or any circumstance shall be held invalid or unenforceable to any extent, the
remainder of this Agreement and the application of such term to the other party
or circumstances shall not be affected thereby and shall be enforced to the
greatest extent permitted by applicable law, so long as the economic and legal
substance of this Agreement and the actions contemplated hereby is not affected
in any manner adverse to any party.

         Section 10.11 Independent Contractors

         The parties are independent contractors, and this Agreement does not
create a partnership or agency relationship between the parties, or any other
relationship between the parties except as expressly set forth herein. No party
shall have any right or authority to assume, create or incur any liability or
obligation, express or implied, in the name or on behalf of any other party.

         Section 10.12 Counterparts

         This Agreement may be executed in counterparts, each of which shall be
deemed to be an original, but all of which together shall constitute one
instrument.

                                       20
<PAGE>

         Section 10.13 Construction

         Each of the parties hereto acknowledges that it has reviewed this
Agreement and that the normal rule of construction to the effect that any
ambiguities are to be resolved against the drafting party shall not be employed
in the interpretation of this Agreement or any amendments hereto. The captions
used herein are for convenience of reference only and shall not affect the
interpretation or construction hereof. All pronouns and any variations thereof
shall be deemed to refer to the masculine, feminine, neuter, singular or plural
as the context may require. Unless otherwise specified, (a) the terms "hereof,"
"herein" and similar terms refer to this Agreement as a whole, (b) references
herein to Articles or Sections refer to articles or sections of this Agreement
and (c) the word "including" connotes the words "including without limitation"
unless the context requires otherwise.

                            [SIGNATURE PAGE FOLLOWS]

                                       21
<PAGE>

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

                                    AT&T WIRELESS SERVICES, INC.

                                    By /s/ MARK BRADNER
                                       -----------------------------------------
                                             Name:
                                             Title:

                                    AMERICAN CELLULAR CORPORATION

                                    By /s/ EVERETT R. DOBSON
                                       -----------------------------------------
                                             Name:
                                             Title:

<PAGE>
                                   SCHEDULE I
                                   ACC MARKETS
Duluth MSA
MN-02A RSA
MN-03 RSA
MN-04 RSA
MN-05 RSA
MN-06 RSA
Wausau MSA
Eau Claire MSA
WI-01 RSA
WI-02 RSA
WI-03 RSA
WI-04 RSA
WI-05A RSA
WI-06A RSA
MI-01 RSA
KY-04 RSA*
KY-05 RSA*
KY-06 RSA*
KY-08 RSA*
OH-7 RSA
OH-10A RSA
WV-02 RSA
WV-03 RSA
PA-09 RSA
Poughkeepsie MSA
Orange County MSA
NY-05 RSA
NY-06 RSA
NE-OK 1.9

----------

*

----------

* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

<PAGE>
                                   SCHEDULE II
                               COMPARABLE MARKETS

----------

* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

<PAGE>

                                  SCHEDULE 2.1
                                CONSTRUCTION PLAN

         ACC will install GSM/GPRS equipment in the following existing sites so
as to provide coverage that is substantially comparable to the TDMA coverage now
provided by these sites.

2003 Q1

*

2003 Q3

*

2003 Q4

*

2004 Q1

*

2004 Q2

*

2004 Q3

*

----------

* ACC reserves the right to remove these markets from Schedule II if Cingular
does not agree to prefer ACC's networks over AWS once Cingular's preference
obligations to AWS are waived.

----------

* Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

<PAGE>
                                  SCHEDULE 2.3
                          NETWORK PERFORMANCE STANDARDS

                          COMPREHENSIVE QUALITY METRICS

                                 * SCHEDULE 2.4
                           CORE FEATURES AND SERVICES

*

----------

*  Confidential information has been omitted and filed separately with the
Securities and Exchange Commission

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