Document:

<PAGE>
                                                                  Exhibit 4.4.2

                          SECOND AMENDMENT AND WAIVER

     THIS SECOND AMENDMENT AND WAIVER (this "AMENDMENT") is entered into as of
March 19, 1999, between SYGNET WIRELESS, INC. (successor by merger to
Dobson/Sygnet Operating Company), an Ohio corporation ("BORROWER"), the Required
Lenders under the Credit Agreement (hereinafter defined), NATIONSBANK, N.A., in
its capacity as Administrative Agent for the Lenders under the Credit Agreement
("ADMINISTRATIVE AGENT"), and Guarantors under the Credit Agreement. Reference
is made to that certain Credit Agreement, dated as of December 23, 1998 (as
amended, modified, supplemented, or restated from time to time, the "CREDIT
AGREEMENT"), among Borrower; Administrative Agent; Lehman Commercial Paper Inc.
and PNC Bank, National Association, as Co-Syndication Agents; Toronto Dominion
(Texas), Inc. and First Union National Bank, as Co-Documentation Agents; and the
Lenders party thereto.

     Unless otherwise defined in this Amendment, capitalized terms used herein
shall have the meaning set forth in the Credit Agreement. Unless otherwise
indicated, all paragraph references herein are to Paragraphs in this Amendment,
and all Section references herein are to Sections in the Credit Agreement.

                                R E C I T A L S

     A.   SECTION 9.27 requires that Borrower enter into Financial Hedges with
respect to at least 50% of the Debt of the Companies and the Parent outstanding
on the Closing Date within 60 days of such date. Borrower has advised
Administrative Agent that due to market conditions, it has not entered into
sufficient Financial Hedges within the time period required by SECTION 9.27 (the
"SUBJECT NONCOMPLIANCE").

     B.   Borrower has requested that Required Lenders waive the Subject
Noncompliance and agree to amend the Credit Agreement to allow Borrower to
purchase additional Financial Hedges. Required Lenders are willing to grant and
agree to such waiver and amendments, subject to and upon the terms and
conditions set forth below.

     NOW, THEREFORE, in consideration of these premises and other valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto agree, as follows:

PARAGRAPH 1.   WAIVER

     1.1  WAIVER. Required Lenders waive any Default or Potential Default that
may exist or arise solely as a result of the Subject Noncompliance and agree
that Lenders will not exercise their Rights under the Loan Papers solely as a
result of the Subject Noncompliance; provided, however, that, the waiver herein
granted is expressly  conditioned upon the requirement that, Borrower shall have
entered into the Financial Hedges required by, and satisfied the requirements
of, SECTION 9.27(A) and (C) (as herein amended) no later than the Effective Date
(hereinafter defined). Except as expressly stated, this Paragraph is not a
waiver of existing or future Defaults or Potential Defaults or a waiver of
Administrative Agent's or any Lender's Rights to insist upon compliance by all
relevant parties with each Loan Paper.

     1.2  COMPLIANCE WITH WAIVER REQUIREMENTS. The failure of Borrower to comply
with the conditions or limitations set forth in this PARAGRAPH 1 shall
constitute a Default entitling the Lenders to exercise their respective rights
under the Credit Agreement and related Loan Papers.

PARAGRAPH 2.   AMENDMENT. Borrower and Required Lenders hereby agree to amend
the Credit Agreement to allow the Borrower to incur Debt owed to Lenders or
their Affiliates arising under Financial Hedges, as well as Debt owed to third
parties (other than Lenders and their Affiliates) arising under Financial

                                                     Second Amendment and Waiver

<PAGE>
Hedges obtained in compliance with SECTION 9.27(A); accordingly, the Credit
Agreement is amended as follows:

          (a)  The definition of Financial Hedge set forth in SECTION 1.1 is
     clarified to read in its entirety, as follows:

               "FINANCIAL HEDGE means a swap, collar, floor, cap, or other
               contract which is intended to reduce or eliminate the risk
               of fluctuations in interest rates, so long as any Financial
               Hedge obtained by Borrower must comply with the applicable
               requirements of SECTION 9.27(C) and must otherwise be in
               compliance with the requirements of the Loan Papers."

          (b)  As Financial Hedges with Lenders and their Affiliates are
     included in the definition of "Obligation," the Debt incurrence provision
     of SECTION 9.12(A)(II) is hereby amended to permit Debt under Financial
     Hedges with third parties (other than Lenders and their Affiliates), but
     only to the extent such Financial Hedges were purchased in fulfillment of
     the requirements of SECTION 9.27(A) and (C); accordingly, SECTION
     9.12(A)(II) is amended in its entirety to read, as follows:

               "(ii) Debt incurred by Borrower under any Financial Hedge
               obtained in satisfaction of SECTION 9.27(A) and in
               compliance with SECTION 9.27(C)."

          (c)  To clarify that Financial Hedges permitted by the Credit
     Agreement are permitted investments, SECTION 9.20 is hereby amended to add
     subsection (G) as follows:

               "(g) Financial Hedges permitted by the Loan Papers."

          (d)  SECTION 9.27 is hereby amended to clarify that: (i) Borrower may
     include the fixed rate Debt under the Senior Notes in demonstrating that
     sufficient Debt of the Companies and Parent has been hedged; (ii) any Debt
     owed to Lenders or their Affiliates by Borrower arising under a Financial
     Hedge that complies with SECTION 9.27(C) will be afforded the benefit of
     pari passu Liens in the Collateral; and (iii) all Financial Hedges (whether
     with third parties or Lenders or Affiliates of Lenders) must satisfy
     certain requirements; accordingly, SECTION 9.27 is amended in its entirety
     to read, as follows:

               "9.27 FINANCIAL HEDGES.

               (a) Borrower shall, on or before the Second Amendment
               Effective Date, enter into, purchase, or acquire Financial
               Hedges in a form and upon terms acceptable to Administrative
               Agent, issued by one or more Lenders or an institution
               acceptable to Administrative Agent (which consent will not
               be unreasonable withheld) with a duration of at least two
               years, which Financial Hedges (together with the aggregate
               principal amount of the Senior Notes as of the Closing Date)
               shall assure that the net interest cost to Borrower on at
               least fifty percent (50%) of the Debt of the Companies and
               Parent outstanding on the Closing Date is fixed, capped, or
               hedged; provided, however, that the protected rate shall be
               no greater than 2.0% above the all-in rate on the Closing
               Date hereof. As used herein, the term "Second Amendment
               Effective Date" means the "Effective Date" as defined in
               that certain Second Amendment and Waiver dated as of March
               19, 1999,

                                       2            Second Amendment and Waiver
                                                    ---------------------------
<PAGE>
               by and between Borrower, Administrative Agent, Required Lenders,
               and Guarantors.

               (b) To the extent any Lender or Affiliate issues a Financial
               Hedge to Borrower, including, without limitation, any Financial
               Hedges with lenders or their Affiliates obtained in satisfaction
               of the requirements of SECTION 9.27(a), such Lender or its
               Affiliate are afforded the benefits of (and Borrower hereby
               confirms a grant of) Liens in and to the Collateral as evidenced
               by the Collateral Documents to the extent of such Lender's (or
               Affiliate thereof's) credit exposure under such Financial Hedge;
               such Lien is pari passu with that of Administrative Agent (held
               for the benefit of Lenders; and by acceptance of such Liens, each
               Affiliate of Lender issuing a Financial Hedge agrees (i) to
               appoint NationsBank, N.A. as its nominee and agent, to act for
               and on behalf of such Affiliate, in connection with the
               Collateral Documents and (ii) to be bound by the terms of SECTION
               12, whereupon all references to "Lender" in SECTION 12 and in the
               Collateral Documents shall include, on any date of determination,
               an Affiliate of any Lender that is party to a then-effective
               Financial Hedge.

               (c)  Financial Hedges held by any Company whether in satisfaction
               of the requirements of this SECTION 9.27 or as otherwise
               permitted by the Loan Papers, shall be subject to the following:
               (i) each such Lender or other institution issuing a Financial
               Hedge shall calculate its credit exposure in a reasonable and
               customary manner; and (ii) all documentation for such Financial
               Hedge shall conform to ISDA standards and must be acceptable to
               Administrative Agent with respect to intercreditor issues.

          (e)  In order to clarify that the "Agreement Among Lenders" in SECTION
     12 includes any Affiliate of a Lender that issues a Financial Hedge,
     SECTION 12.2 and 12.3 are hereby amended by substituting the words "ratable
     portion" for each reference to "Pro Rata Part;" and SECTION 12.4 is hereby
     amended by substituting the word "Obligation" for each reference to
     "Principal Debt."

          (f)  SECTION 13.13 is hereby amended by adding SECTION 13.13(b)(v) to
     provide that so long as any Lender is an Agent, such Lender (or an
     Affiliate thereof) must retain an economic interest in the Loan Papers.
     Accordingly, SECTION 13.13(b)(v) shall read in its entirety, as follows:

               "(v) so long as any Lender is an Agent under this Agreement, such
               Lender (or an Affiliate of such Lender) shall retain an economic
               interest in the Loan Papers, will not assign all of its Rights,
               duties, or obligations under the Loan Papers, except to an
               Affiliate of such Lender, and will not enter into any Assignment
               and Acceptance Agreement that would have the effect of such
               Lender assigning all of its Rights, duties, or obligations under
               the Loan Papers to any Person other than an Affiliate of such
               Lender.

PARAGRAPH 3.   EFFECTIVE DATE. This Amendment shall be effective on the date
(the "EFFECTIVE DATE") upon which each of the following requirements have been
satisfied: (a) Administrative Agent receives counterparts of this Amendment
executed by Borrower, each Guarantor under the Credit Agreement, and Required
Lenders and (b) Borrower shall provide evidence satisfactory to Administrative
Agent that it has complied with the provisions of PARAGRAPH 1.

                                       3
                                                     SECOND AMENDMENT AND WAIVER
<PAGE>
PARAGRAPH 4. ACKNOWLEDGEMENT AND RATIFICATION. As a material inducement to
Administrative Agent and the Lenders to execute and deliver this Amendment,
Borrower and each Guarantor (i) consent to the agreements in this Amendment
and (ii) agree and acknowledge that the execution, delivery, and performance of
this Amendment shall in no way release, diminish, impair, reduce, or otherwise
affect the respective obligations of Borrower or Guarantors under their
respective Collateral Documents, which Collateral Documents and shall remain in
full force and effect, and all liens, guaranties and rights thereunder are
hereby ratified and confirmed.

PARAGRAPH 5. REPRESENTATIONS. As a material inducement to Administrative Agent
and the Lenders to execute and deliver this Amendment, Borrower and each
Guarantor represent and warrant to such parties (with the knowledge and intent
that the Lenders and Administrative Agent are relying upon the same in entering
into this Amendment) that as of the Effective Date of this Amendment and as of
the date of execution of this Amendment: (a) all representations and warranties
in the Credit Agreement and related Loan Papers and the are true and correct in
all material respects as though made on the date hereof, except to the extent
that (i) any of them speak to a different specific date or (ii) the facts on
which any of them were based have been changed by transactions contemplated or
permitted by the Credit Agreement; (b) no Default or Potential Default exists
under the Credit Agreement and related Loan Papers; and (c) this Amendment has
been duly authorized and approved by all necessary corporate action and requires
the consent of no other Person, and upon execution and delivery, this Amendment
shall be binding and enforceable against Borrower and each Guarantor in
accordance with its terms.

PARAGRAPH 6. EXPENSES. Borrower shall pay all costs, fees, and expenses paid or
incurred by Administrative Agent incident to this Amendment, including, without
limitation, the reasonable fees and expenses of Administrative Agent's counsel
in connection with the negotiation, preparation, delivery, and execution of
this Amendment and any related documents.

PARAGRAPH 7. MISCELLANEOUS. This Amendment is one of the "Loan Papers" referred
to in the Credit Agreement and the provisions of SECTION 13 of the Credit
Agreement relating to the Credit Agreement and the related Loan Papers are
incorporated herein by reference. Unless stated otherwise (a) the singular
number includes the plural and vice versa and words of any gender include each
other gender, in each case, as appropriate, (b) headings and captions may not be
construed in interpreting provisions, (c) this Amendment must be construed, and
its performance enforced, under Texas law, and (d) this Amendment may be
executed in any number of counterparts with the same effect as if all
signatories had signed the same document, and all of those counterparts must be
construed together to constitute the same document.

PARAGRAPH 8. ENTIRETIES. THIS AMENDMENT REPRESENTS THE FINAL AGREEMENT BETWEEN
THE PARTIES ABOUT THE SUBJECT MATTER OF THIS AMENDMENT AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

PARAGRAPH 9. PARTIES. This Amendment binds and inures to Borrower,
Administrative Agent, Lenders, Guarantors, and their respective successors and
assigns.

     The parties hereto have executed this Amendment in multiple counterparts
on the date stated on the signature pages hereto, but effective as of Effective
Date.

                    [REMAINDER OF PAGE INTENTIONALLY BLANK.
                            SIGNATURE PAGES FOLLOW.]

                                       4             SECOND AMENDMENT AND WAIVER
<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         SYGNET WIRELESS, INC. (successor by merger to
                         Dobson/Sygnet Operating Company), as Borrower

                         By        /s/ Richard D. Sewell Jr.
                                   -----------------------------------------

                         (Name)    Richard D. Sewell Jr.
                                   -----------------------------------------

                         (Title)   Treasurer
                                   -----------------------------------------

                         SYGNET COMMUNICATIONS, INC., as Guarantor

                         By        /s/ Richard D. Sewell Jr.
                                   -----------------------------------------

                         (Name)    Richard D. Sewell Jr.
                                   -----------------------------------------

                         (Title)   Treasurer
                                   -----------------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         NATIONSBANK, N.A.,
                         as Administrative Agent and a Lender

                         By        /s/ Julie A. Schell
                                   -----------------------------------------

                         (Name)    JULIE A. SCHELL
                                   -----------------------------------------

                         (Title)   VICE PRESIDENT
                                   -----------------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         BANK OF MONTREAL, as a Lender

                         By:       /s/ W.T. Calder
                                   -----------------------------------------

                         Name:     W.T. CALDER
                                   -----------------------------------------

                         Title:    MANAGING DIRECTOR
                                   -----------------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         The Bank of Nova Scotia,
                        -----------------------------------------
                         as a Lender

                         By:       /s/ Paul A. Weissenberger
                                   -----------------------------------------

                         Name:     P.A. WEISSENBERGER
                                   -----------------------------------------

                         Title:    AUTHORIZED SIGNATORY
                                   -----------------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         BHF-BANK AKTIENGELSELLSCHAFT,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Michael T. Pellerito
                                   -----------------------------------------

                         Name:     MICHAEL T. PELLERITO
                                   -----------------------------------------

                         Title:    AT
                                   -----------------------------------------

                         By:       /s/ Dan Dobrjanskyj
                                   -----------------------------------------

                         Name:     DAN DOBRJANSKYJ
                                   -----------------------------------------

                         Title:    ASSISTANT VICE PRESIDENT
                                   -----------------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         CIBC INC.,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Harold Birk
                                   -----------------------------------------

                         Name:     HAROLD BIRK
                                   -----------------------------------------

                         Title:    EXECUTIVE DIRECTOR
                                   -----------------------------------------
                                   CIBC OPPENHEIMER CORP., AS AGENT

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         The CIT Group/Equipment Financing, Inc.,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ J.E. Palmer
                                   -----------------------------------------

                                   Name:    J.E. PALMER
                                            --------------------------------

                                   Title:   ASSISTANT VICE PRESIDENT
                                            ---------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         CREDIT LYONNAIS NEW YORK BRANCH, as a Lender

                         By:       /s/ Mark D. Thorsheim
                                   -----------------------------------------

                                   Name:    MARK D. THORSHEIM
                                            --------------------------------

                                   Title:   VICE PRESIDENT
                                            --------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         CypressTree Institutional Fund, LLC
                         By:  CypressTree Investment Management Company,
                              Inc. its Managing Member,
                         ---------------------------------------------------
                         as a Lender

                         By:       /s/ Catherine C. McDermott
                                   -----------------------------------------

                                   Name:    CATHERINE C. McDERMOTT
                                            --------------------------------

                                   Title:   PRINCIPAL
                                            --------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         CypressTree Institutional Fund, LLC
                         By:  CypressTree Investment Management Company,
                              Inc. its Managing Member,
                         ---------------------------------------------------
                         as a Lender

                         By:       /s/ Catherine C. McDermott
                                   -----------------------------------------

                                   Name:    CATHERINE C. McDERMOTT
                                            --------------------------------

                                   Title:   PRINCIPAL
                                            --------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         CypressTree Senior Floating Rate Fund
                         By:  CypressTree Investment Management Company,
                              Inc. as Portfolio Manager,
                         ---------------------------------------------------
                         as a Lender

                         By:       /s/ Catherine C. McDermott
                                   -----------------------------------------

                                   Name:    CATHERINE C. McDERMOTT
                                            --------------------------------

                                   Title:   PRINCIPAL
                                            --------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         EATON VANCE SENIOR INCOME TRUST
                         BY:  EATON VANCE MANAGEMENT
                              AS INVESTMENT ADVISOR,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Paysen F. Swaffield
                                   -----------------------------------------

                                   Name:    Paysen F. Swaffield
                                            --------------------------------

                                   Title:   Vice President
                                            --------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         ELC (Caymen) Ltd.,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ E.A. Kaatlman, III
                                   -----------------------------------------

                                   Name:     E.A. KAATLMAN, III
                                             -------------------------------

                                   Title:    MANAGING DIRECTOR
                                             -------------------------------

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         First Union National Bank,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Anthony E. Parial
                                   -----------------------------------------

                                   Name:     Anthony E. Parial
                                             -------------------------------

                                   Title:    Vice President
                                             -------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         Fleet National Bank,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Christine Campanelli
                                   -----------------------------------------

                                   Name:     Christine Campanelli
                                             -------------------------------

                                   Title:    Vice President
                                             -------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         FRANKLIN FLOATING RATE TRUST, as a Lender

                         By:       /s/ Chauncey Lufkin
                                   -----------------------------------------

                                   Name:     Chauncey Lufkin
                                             -------------------------------

                                   Title:    Vice President
                                             -------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         THE FUJI BANK, LIMITED,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Masahito Fukuda
                                   -----------------------------------------

                                   Name:     Masahito Fukuda
                                             -------------------------------

                                   Title:    Joint General Manager
                                             -------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                         STEIN ROE & FARNHAM
                         INCORPORATED,
                         AS AGENT FOR KEYPORT LIFE
                         INSURANCE COMPANY,
                         -----------------------------------------
                         as a Lender

                         By:       /s/ Brian W. Good
                                   -----------------------------------------

                                   Name:     Brian W. Good
                                             -------------------------------

                                   Title:    Vice President & Portfolio Manager
                                             -------------------------------

                       SIGNATURE PAGE TO SECOND AMENDMENT

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                   KZH CYPRESSTREE-1 LLC,
                                   ---------------------------------------------
                                   as a Lender

                                   By: /s/ Virginia Conway
                                       -----------------------------------------
                                       Name:  Virginia Conway
                                              ----------------------------------
                                       Title: Authorized Agent
                                              ----------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operating Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                   Lehman Commercial Paper Inc.,
                                   ---------------------------------------------
                                   as a Lender

                                   By: /s/ Michele Swanson
                                       -----------------------------------------
                                       Name:  Michele Swanson
                                              ----------------------------------
                                       Title: Authorized Signatory
                                              ----------------------------------

                                   By: -----------------------------------------
                                       Name:  ----------------------------------
                                       Title: ----------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                   Metropolitan Life Insurance Company,
                                   --------------------------------------------
                                   as a Lender

                                   By: /s/ James R. Dingler
                                       ----------------------------------------
                                       Name:  James R. Dingler
                                             ----------------------------------
                                       Title: Director
                                             ----------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                   NATIONAL CITY BANK,
                                   --------------------------------------------
                                   as a Lender

                                   By: /s/ Theodore M. Schmidt
                                       ----------------------------------------
                                       Name:  Theodore M. Schmidt
                                             ----------------------------------
                                       Title: Vice President
                                             ----------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                   North American Senior Floating Rate Fund
                                   By: CypressTree Investment Management
                                       Company, Inc. as Portfolio Manager,
                                   --------------------------------------------
                                   as a Lender

                                   By: /s/ Catherine C. McDermott
                                       ----------------------------------------
                                       Name:  CATHERINE C. McDERMOTT
                                              ---------------------------------
                                       Title: PRINCIPAL
                                              ---------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March
19, 1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                   The OFFITBANK Investment Fund Inc.
                                   --------------------------------------------
                                   as a Lender

                                   By: /s/ Vincent Pella
                                       ----------------------------------------
                                       Name:  Vincent Pella
                                              ---------------------------------
                                       Title: Asst. Treasurer
                                              ---------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among  Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.),
as Administrative Agent, Required Lenders, and Guarantors.

                                                         PARIBAS,
                                        ----------------------------------------
                                        as a Lender

                                        By: /s/ Darlynn Kitcher
                                            ------------------------------------
                                            Name: Darlynn Kitcher
                                            Title: Vice President

                                        By: /s/ Thomas G. Brandt
                                            ------------------------------------
                                            Name: Thomas G. Brandt
                                            Title: Director

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among  Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.),
as Administrative Agent, Required Lenders, and Guarantors.

                                        PILGRIM PRIME RATE TRUST,
                                        ----------------------------------------
                                        as a Lender By: Pilgrim Investments,
                                                        Inc., as its investment
                                                        manager

                                        By: /s/ Robert L. Wilson
                                            ------------------------------------
                                            Name: Robert L. Wilson
                                            Title: Vice President

                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among  Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.),
as Administrative Agent, Required Lenders, and Guarantors.

                                        PNC BANK, NATIONAL ASSOCIATION,
                                        ----------------------------------------
                                        as a Lender

                                        By: /s/ Thomas A. Coates
                                            ------------------------------------
                                            Name: Thomas A. Coates
                                            Title: Vice President

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among  Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.),
as Administrative Agent, Required Lenders, and Guarantors.

                                        SENIOR DEBT PORTFOLIO,
                                        ----------------------------------------
                                        as a Lender By: Boston Management and
                                                        Research as Investment
                                                        Advisor

                                        By: /s/ Payson F. Swaffield
                                            ------------------------------------
                                            Name: Payson F. Swaffield
                                            Title: Vice President

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among  Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                              STEIN ROE FLOATING RATE LIMITED LIABILITY COMPANY,
                              --------------------------------------------------
                              as a Lender

                              By: /s/ Brian W. Good
                              --------------------------------------------------
                              Name: Brian W. Good
                              Title: Vice President,
                                     Stein Roe & Farnham Incorporated
                                     as Advisor to the Stein Roe Floating Rate
                                     Limited Liability Company

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                             Toronto Dominion (Texas), Inc.,
                                             -----------------------------------
                                             as a Lender

                                             By:  /s/ Jimmy Simion
                                                 -------------------------------
                                                 Name:  Jimmy Simion
                                                        ------------------------
                                                 Title: Vice President
                                                        ------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                             U.S. Bank National Association,
                                             -----------------------------------
                                             as a Lender

                                             By:  /s/ Thomas G. Gunder
                                                 -------------------------------
                                                 Name:  Thomas G. Gunder
                                                        ------------------------
                                                 Title: V.P.
                                                        ------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                     Van Kampen Prime Rate Income Trust,
                                     -------------------------------------------
                                     as a Lender

                                     By:  /s/ Jeffrey W. Maillet
                                         ---------------------------------------
                                         Name:  Jeffrey W. Maillet
                                                --------------------------------
                                         Title: Senior Vice President & Director
                                                --------------------------------

                       Signature Page to Second Amendment

<PAGE>
Signature Page to that certain Second Amendment and Waiver dated as of March 19,
1999, among Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet
Operation Company), as Borrower under the Credit Agreement, NationsBank, N.A.,
as Administrative Agent, Required Lenders, and Guarantors.

                                     VAN KAMPEN SENIOR INCOME TRUST,
                                     -------------------------------------------
                                     as a Lender

                                     By:  /s/ Jeffrey W. Maillet
                                         ---------------------------------------
                                         Name:  Jeffrey W. Maillet
                                                --------------------------------
                                         Title: Senior Vice President & Director
                                                --------------------------------

                       Signature Page to Second Amendment<PAGE>
                                                                  Exhibit 4.4.3

                                THIRD AMENDMENT

     THIS THIRD AMENDMENT (this "AMENDMENT") is entered into as of May 28, 1999,
between SYGNET WIRELESS, INC. (successor by merger to Dobson/Sygnet Operating
Company), an Ohio corporation ("BORROWER"), the Required Lenders under the
Credit Agreement (hereinafter defined), NATIONSBANK, N.A., in its capacity as
Administrative Agent for the Lenders under the Credit Agreement ("ADMINISTRATIVE
Agent"), and Guarantors under the Credit Agreement. Reference is made to that
certain Credit Agreement, dated as of December 23, 1998 (as amended, modified,
supplemented, or restated from time to time, the "CREDIT AGREEMENT"), among
Borrower; Administrative Agent; Lehman Commercial Paper Inc. and PNC Bank,
National Association, as Co-Syndication Agents; Toronto Dominion (Texas), Inc.
and First Union National Bank, as Co-Documentation Agents; and the Lenders party
thereto.

     Unless otherwise defined in this Amendment, capitalized terms used herein
shall have the meaning set forth in the Credit Agreement. Unless otherwise
indicated, all Paragraph references herein are to Paragraphs in this Amendment,
and all Section references herein are to Sections in the Credit Agreement.

                                R E C I T A L S

     A.   Borrower has requested that Required Lenders agree to amend the Credit
Agreement to provide that the Operating Cash Flow of the Companies used in the
calculation of Communications Operating Cash Flow for the fiscal quarters ending
December 31, 1998, and March 31, 1999, be calculated on an annualized basis,
rather than on a Rolling Period basis.

     B.   Required Lenders are willing to amend the Credit Agreement to make the
change requested by Borrower, but only upon the conditions, among other things,
that Borrower, each Guarantor under the Credit Agreement, and Required Lenders
shall have executed and delivered this Amendment and shall have agreed to the
terms and conditions of this Amendment.

     NOW, THEREFORE, in consideration of these premises and other valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the
parties hereto agree, as follows:

PARAGRAPH 1.   AMENDMENT. Borrower and Required Lenders hereby agree to amend
the Credit Agreement to allow Borrower to calculate the Operating Cash Flow of
the Companies used in the calculation of Communications Operating Cash Flow for
the fiscal quarters ending December 31, 1998, and March 31, 1999, on an
annualized basis, rather than on a Rolling Period basis; accordingly, the Credit
Agreement is amended as follows:

     (a)  The definition of "Communications Operating Cash Flow" in SECTION 1 of
the Credit Agreement is amended in its entirety to read as follows:

          "COMMUNICATIONS OPERATING CASH FLOW means (a) at any date of
          determination on or prior to March 31, 1999, thereof, the
          sum of (i) the Operating Cash Flow of Communications and its
          Subsidiaries (other than the Companies and Logix and its
          Subsidiaries) on a consolidated basis, plus (ii) the
          Annualized Operating Cash Flow or (b) on any date of
          determination occurring after April 1, 1999, the Operating
          Cash Flow of Communications and its Subsidiaries (other than
          Logix and its Subsidiaries) on a consolidated basis;
          calculations of Communications Operating Cash Flow should be
          adjusted, as required (and without duplication), to take
          into account any minority ownership in any Subsidiary or
          Cellular Partnership;

                                                                 Third Amendment

<PAGE>
         provided, however, with respect to any Cellular Partnership
         of Communications or its Subsidiaries (other than Logix and
         its Subsidiaries), which is indebted to Communications or any
         Subsidiary of Communications (other than Logix and its
         Subsidiaries) (the "CELLULAR PARTNERSHIP DEBT"), such
         adjustments for minority interests shall be made only when
         either (i) such Cellular Partnership Debt has been paid in
         full or (ii) Communications or any Subsidiary of
         Communications (other than Logix and its Subsidiaries) does
         not have a Lien upon and right to apply 100% of the Operating
         Cash Flow of such Cellular Partnership to repayment of such
         Cellular Partnership Debt.

PARAGRAPH 2. AMENDMENT EFFECTIVE DATE. This Amendment shall be binding upon all
parties to the Loan Papers on the last day upon which counterparts of this
Amendment shall have been executed and delivered to Administrative Agent by
Borrower, Required Lenders, and each Guarantor under the Credit Agreement;
whereupon this Amendment shall be deemed effective as of December 31, 1998 (the
"AMENDMENT EFFECTIVE DATE").

PARAGRAPH 3. ACKNOWLEDGMENT AND RATIFICATION. As a material inducement to
Administrative Agent and the Lenders to execute and deliver this Amendment,
Borrower and each Guarantor (i) consent to the agreements in this Amendment and
(ii) agree and acknowledge that the execution, delivery, and performance of this
Amendment shall in no way release, diminish, impair, reduce, or otherwise affect
the respective obligations of Borrower or Guarantors under their respective
Collateral Documents, which Collateral Documents shall remain in full force and
effect, and all liens, guaranties, and rights thereunder are hereby ratified and
confirmed.

PARAGRAPH 4. REPRESENTATIONS. As a material inducement to Administrative Agent
and the Lenders to execute and deliver this Amendment, Borrower and each
Guarantor represent and warrant to such parties (with the knowledge and intent
that the Lenders and Administrative Agent are relying upon the same in entering
into this Amendment) that as of the Amendment Effective Date and as of the date
of execution of this Amendment: (a) all representations and warranties in the
Credit Agreement and related Loan Papers are true and correct in all material
respects as though made on the date hereof, except to the extent that (i) any of
them speak to a different specific date or (ii) the facts on which any of them
were based have been changed by transactions contemplated or permitted by the
Credit Agreement; (b) no Default or Potential Default exists under the Credit
Agreement and related Loan Papers; and (c) this Amendment has been duly
authorized and approved by all necessary corporate action and requires the
consent of no other Person, and upon execution and delivery, this Amendment
shall be binding and enforceable against Borrower and each Guarantor in
accordance with its terms.

PARAGRAPH 5. EXPENSES. Borrower shall pay all costs, fees, and expenses paid or
incurred by Administrative Agent incident to this Amendment, including, without
limitation, the reasonable fees and expenses of Administrative Agent's counsel
in connection with the negotiation, preparation, delivery, and execution of
this Amendment and any related documents.

PARAGRAPH 6. MISCELLANEOUS.

     6.1  This Amendment is one of the "Loan Papers" referred to in the Credit
Agreement and the provisions of SECTION 13 of the Credit Agreement relating to
the Credit Agreement and the related Loan Papers are incorporated herein by
reference. Unless stated otherwise (a) the singular number includes the plural
and vice versa and words of any gender include each other gender, in each case,
as appropriate, (b) headings and captions may not be construed in interpreting
provisions, (c) this Amendment must be construed, and its performance enforced,
under Texas law, and (d) this Amendment may be executed in any

                                       2

                                                                 THIRD AMENDMENT

<PAGE>
number of counterparts with the same effect as if all signatories had signed
the same document, and all of those counterparts must be construed together to
constitute the same document.

     6.2  The Credit Agreement and all related Loan Papers shall remain
unchanged and in full force and effect, except as provided in this Amendment,
and are hereby ratified and confirmed. Upon execution and approval of this
Amendment by the required parities, all references to the "Credit Agreement"
made on and after the Amendment Effective Date, shall be to the Credit Agreement
as herein amended. The execution, delivery, and effectiveness of this Amendment
shall not, except as expressly provided herein, operate as a waiver of any
Rights of the Lenders under the Credit Agreement or any Loan Papers, nor
constitute a waiver under the Credit Agreement or any other provision of the
Loan Papers.

PARAGRAPH 7. ENTIRETIES. THIS AMENDMENT REPRESENTS THE FINAL AGREEMENT BETWEEN
THE PARTIES ABOUT THE SUBJECT MATTER OF THIS AMENDMENT AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

PARAGRAPH 9. PARTIES. This Amendment binds and inures to Borrower,
Administrative Agent, Lenders, Guarantors, and their respective successors and
assigns.

     The parties hereto have executed this Amendment in multiple counterparts
on the date stated on the signature pages hereto, but effective as of Amendment
Effective Date.

                    [REMAINDER OF PAGE INTENTIONALLY BLANK.
                            SIGNATURE PAGES FOLLOW.]

                                       3
                                                                 THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                   SYGNET WIRELESS, INC. (successor by merger to
                                   Dobson/Sygnet Operating Company), as Borrower

                                   By /s/ Richard D. Sewell, Jr.
                                      ------------------------------------------
                                   (Name) Richard D. Sewell, Jr.
                                   (Title) Treasurer

                                   SYGNET COMMUNICATIONS, INC., as Guarantor

                                   By /s/ Richard D. Sewell, Jr.
                                      ------------------------------------------
                                   (Name) Richard D. Sewell, Jr.
                                   (Title) Treasurer

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                   NATIONSBANK, N.A.,
                                   as Administrative Agent and a Lender

                                   By /s/ Julie A. Schell
                                      ------------------------------------------
                                   (Name) Julie A. Schell
                                   (Title) Vice President

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                   Name of Lender:

                                   BANK OF MONTREAL

                                   By: /s/ Ola Anderssen
                                       -----------------------------------------
                                       Name: Ola Anderssen
                                       Title: Director

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                   Name of Lender:

                                   THE BANK OF NOVA SCOTIA

                                   By: /s/ Paul A. Weissenberger
                                       -----------------------------------------
                                       Name: P.A. Weissenberger
                                       Title: Authorized Signatory

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                   Name of Lender:

                                   BHF-BANK AKTIENGESELLSCHAFT
                                   ---------------------------------------------

                                   By: /s/ Michael T. Pellerito
                                       -----------------------------------------
                                       Name: Michael T. Pellerito
                                       Title: AVP

                                   By: /s/ Dan Dobrianskyi
                                       -----------------------------------------
                                       Name: Dan Dobrianskyi
                                       Title: Assistant Vice President

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                   Name of Lender:

                                   CIBC INC.
                                   ---------------------------------------------

                                   By: /s/ Laura Hom
                                       -----------------------------------------
                                       Name: Laura Hom
                                       Title: Executive Director
                                              World Markets Corp. As Agent

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                        Name of Lender:

                                        THE CIT Group/Equipment Financing, Inc.
                                        ----------------------------------------

                                        By:  /s/ J.E. Palmer
                                             ----------------------------------
                                             Name: J.E. Palmer
                                                   ----------------------------
                                             Title: Assistant Vice President
                                                    ---------------------------

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                        Name of Lender:

                                        CREDIT LYONNAIS NEW YORK BRANCH
                                        ----------------------------------------

                                        By:  /s/ Mark D. Thorsheim
                                             ----------------------------------
                                             Name: MARK D. THORSHEIM
                                                   ----------------------------
                                             Title: VICE PRESIDENT
                                                    ---------------------------

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                        CypressTree Institutional Fund, LLC
                                        By: CypressTree Investment Management
                                            Company, Inc. its Managing Member

                                        By:  /s/ Catherine C. McDermott
                                             ----------------------------------
                                             Name: Catherine C. McDermott
                                                   ----------------------------
                                             Title: Principal
                                                    ---------------------------

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                        CypressTree Institutional Fund, LLC
                                        By: CypressTree Investment Management
                                            Company, Inc. its Managing Member

                                        By:  /s/ Catherine C. McDermott
                                             ----------------------------------
                                             Name: Catherine C. McDermott
                                                   ----------------------------
                                             Title: Principal
                                                    ---------------------------

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                        CypressTree Senior Floating Rate Fund
                                        By: CypressTree Investment Management
                                            Company, Inc. as Portfolio Manager

                                        By:  /s/ Catherine C. McDermott
                                             ----------------------------------
                                             Name: Catherine C. McDermott
                                                   ----------------------------
                                             Title: Principal
                                                    ---------------------------

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                        Name of Lender: EATON VANCE SENIOR
                                        INCOME TRUST
                                        By: EATON VANCE MANAGEMENT
                                            -----------------------------------
                                             AS INVESTMENT ADVISOR
                                            -----------------------------------

                                        By:  /s/ Rayson F. Swaffield
                                             ----------------------------------
                                             Name: Rayson F. Swaffield
                                                   ----------------------------
                                             Title: Vice President
                                                    ---------------------------

                       Signature Page to Third Amendment

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       First Union National Bank
                                       -----------------------------------------

                                       By: /s/ Jon W. Peterson
                                           -------------------------------------
                                           Name: Jon W. Peterson
                                                 -------------------------------
                                           Title: Vice President
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       Fleet National Bank
                                       -----------------------------------------

                                       By: /s/ Christine Campanelli
                                           -------------------------------------
                                           Name: Christine Campanelli
                                                 -------------------------------
                                           Title: VP
                                                  -----------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       THE FUGI BANK, LIMITED
                                       -----------------------------------------

                                       By: /s/ Masahito Sukuda
                                           -------------------------------------
                                           Name: MASAHITO SUKUDA
                                                 -------------------------------
                                           Title: JOINT GENERAL MANAGER
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       STEIN ROE & FARNHAM
                                       INCORPORATED, AS AGENT FOR
                                       KEYPORT LIFE INSURANCE COMPANY

                                       By: /s/ Brian W. Good
                                           -------------------------------------
                                       Name: Brian W. Good
                                             -----------------------------------
                                       Title: Vice President & Portfolio Manager
                                             -----------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       KZH CYPRESSTREE-1 LLC
                                       -----------------------------------------

                                       By: /s/ Peter Chin
                                           -------------------------------------
                                           Name: PETER CHIN
                                                 -------------------------------
                                           Title: AUTHORIZED AGENT
                                                  ------------------------------

                                       By:
                                           -------------------------------------
                                           Name:
                                                 -------------------------------
                                           Title:
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT

<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       KZH STERLING LLC
                                       -----------------------------------------

                                       By:
                                           -------------------------------------

                                           By: /s/ Peter Chin
                                               ---------------------------------
                                              Name: PETER CHIN
                                                    ----------------------------
                                              Title: AUTHORIZED AGENT
                                                     ---------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       Lehman Commercial Paper Inc., as
                                       Co Syndication Agent
                                       -----------------------------------------

                                       By: /s/ Michele Swanson
                                           -------------------------------------
                                           Name: Michele Swanson
                                                 -------------------------------
                                           Title: Authorized Signatory
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       Metropolitan Life Insurance Company
                                       -----------------------------------------

                                       By: /s/ James R. Dingler
                                           -------------------------------------
                                           Name: James R. Dingler
                                                 -------------------------------
                                           Title: Director
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       NATIONAL CITY BANK
                                       -----------------------------------------

                                       By: /s/ Theodore M. Schmidt
                                           -------------------------------------
                                           Name: Theodore M. Schmidt
                                                 -------------------------------
                                           Title: Vice President
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       NORTH AMERICAN SENIOR FLOATING RATE FUND
                                       BY: CYPRESS INVESTMENT MANAGEMENT
                                           COMPANY, INC. AS PORTFOLIO MANAGER

                                           By: /s/ Catherine C. McDermott
                                              ----------------------------------
                                              Name: Catherine C. McDermott
                                                    ----------------------------
                                              Title: Principal
                                                     ---------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       PARIBAS
                                       -----------------------------------------

                                       By: /s/ Darlynn Kitcher
                                           -------------------------------------
                                           Name: DARLYNN KITCHER
                                                 -------------------------------
                                           Title: VICE PRESIDENT
                                                  ------------------------------

                                       By: /s/ Raymond T. Baxter
                                           -------------------------------------
                                           Name: FOR: THOMAS BRANDT
                                                 -------------------------------
                                           Title: DIRECTOR
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       PILGRIM PRIME RATE TRUST
                                       -----------------------------------------

                                       By: Pilgrim Investments, Inc.
                                           -------------------------------------
                                           as its investment manager

                                       By: /s/ Robert L. Wilson
                                           -------------------------------------

                                           Name: Robert L. Wilson
                                                 -------------------------------
                                           Title: Vice President
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                                       Name of Lender:

                                       PNC BANK, NATIONAL ASSOCIATION
                                       -----------------------------------------

                                       By: /s/ Eunice De Jesus
                                           -------------------------------------
                                           Name: Eunice De Jesus
                                                 -------------------------------
                                           Title: Banking Officer
                                                  ------------------------------

                       SIGNATURE PAGE TO THIRD AMENDMENT
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender: SENIOR DEBT PORTFOLIO
                                             By: Boston Management and Research
                                                 as Investment Advisor
                             ---------------------------------------------------

                             By:
                                 -----------------------------------------------

                                 By: /s/ Payson F. Swaffield
                                     -------------------------------------------

                                     Name:  Payson F. Swaffield
                                           -------------------------------------

                                     Title: Vice President
                                            ------------------------------------

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender:
                                   STEIN ROE FLOATING RATE
                                   LIMITED LIABILITY COMPANY

                             By: /s/ Brian W. Good
                                ------------------------------------------------

                                Name:   Brian W. Good
                                       -----------------------------------------

                                Title: Vice President,
                                       Stein Roe & Farnham Incorporated,
                                       as Advisor to the Stein Roe Floating Rate
                                       Limited Liability Company
                                       -----------------------------------------

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender: SYNDICATED LOAN FUNDING TRUST
                                             BY: LEHMAN COMMERCIAL PAPER INC.
                                                 NOT IN ITS INDIVIDUAL CAPACITY
                                                 BUT SOLELY AS ASSET MANAGER
                             ---------------------------------------------------

                             By: /s/ Michele Swanson
                                 -----------------------------------------------

                                     Name: Michele Swanson
                                           -------------------------------------

                                     Title: Authorized Signatory
                                            ------------------------------------

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender:

                             Toronto Dominion (Texas), Inc.
                             ---------------------------------------------------

                             By: /s/ Jimmy Simien
                                 -----------------------------------------------

                                 Name:  Jimmy Simien
                                        ----------------------------------------

                                 Title: Vice President
                                        ----------------------------------------

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender:

                             U.S. Bank National Association
                             ---------------------------------------------------

                             By: /s/ Thomas G. Gunder
                                 -----------------------------------------------

                                 Name:  Thomas G. Gunder
                                       -----------------------------------------

                                 Title: V.P.
                                        ----------------------------------------

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender:

                             VAN KAMPEN
                             PRIME RATE INCOME TRUST
                             ---------------------------------------------------

                             By: /s/ Jeffrey W. Maillet
                                 -----------------------------------------------

                                 Name:  JEFFREY W. MAILLET
                                       -----------------------------------------

                                 Title: Senior Vice President & Director
                                        ----------------------------------------

                       Signature Page to Third Amendment
<PAGE>
Signature Page to that certain Third Amendment dated as of May 28, 1999, among
Sygnet Wireless, Inc. (successor by merger to Dobson/Sygnet Operation Company),
as Borrower under the Credit Agreement, NationsBank, N.A., as Administrative
Agent, Required Lenders, and Guarantors.

                             Name of Lender:

                             VAN KAMPEN
                             SENIOR INCOME TRUST
                             ---------------------------------------------------

                             By: /s/ Jeffrey W. Maillet
                                 -----------------------------------------------

                                 Name:  Jeffrey W. Maillet
                                       -----------------------------------------

                                 Title: Senior Vice President & Director
                                        ----------------------------------------

                       Signature Page to Third Amendment

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00045-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00045-of-00352.parquet"}]]