Document:

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                                                                   EXHIBIT 10.2

                                                               SONERA AGREEMENT
                                                                 EXECUTION COPY

                       VOICESTREAM STOCKHOLDERS AGREEMENT

                  This VoiceStream Stockholders Agreement (this "Agreement")
dated as of August 26, 2000 among Powertel, Inc., a Delaware corporation
("Powertel"), each of the stockholders of VoiceStream listed on the signature
page hereto (each, a "Stockholder" ), and VoiceStream Wireless Corporation, a
Delaware corporation ("VoiceStream") solely for purposes of Section 6.

                  WHEREAS, simultaneously with the execution of this Agreement,
VoiceStream and Powertel are entering into an Agreement and Plan of Merger (the
"Powertel Merger Agreement"), dated as of the date hereof, providing, among
other things, for the merger of a subsidiary of VoiceStream with and into
Powertel (the "Merger");

                  WHEREAS, Powertel has agreed to enter into the Powertel
Merger Agreement only if the VoiceStream Principal Stockholders enter into a
VoiceStream Voting Agreement, including this Agreement;

                  WHEREAS, in the Powertel Merger Agreement VoiceStream has
agreed, subject to the conditions set forth therein, to acquire all of the
shares of Powertel Common Stock (as defined below);

                  NOW THEREFORE, in consideration of the foregoing and the
mutual premises, representations, warranties, covenants and agreements
contained herein and in the Merger Agreement, the parties hereto, intending to
be legally bound hereby, agree as follows:

                  1.       Certain Definitions.

                  This Agreement is one of the VoiceStream Voting Agreements
referenced in the recitals to the Powertel Merger Agreement. For the purposes
of this Agreement, all capitalized terms used but not otherwise defined herein
shall have the respective meanings given to such terms in the Powertel Merger
Agreement.

                  For the purposes of this Agreement, the words "beneficially
owned" or "beneficial ownership" shall include, with respect to any securities,
the beneficial ownership by a Stockholder and by any direct or indirect
Subsidiary of a Stockholder.

                  "Transfer" means, with respect to any security, the sale,
transfer, pledge, hypothecation, encumbrance, assignment or other disposition
of such security or the record or beneficial ownership thereof, the offer to
make such a sale, transfer or other disposition, and each agreement,
arrangement or understanding, whether or not in writing, to effect any of the
foregoing.

                  2.       Representations; Warranties and Covenants of Each
Stockholder. Each Stockholder hereby represents and warrants, severally and not
jointly, to Powertel, solely with respect to itself, as follows:

<PAGE>   2

                  (a)      Title. As of the date hereof, such Stockholder is
the sole record or beneficial owner of the number of shares of VoiceStream
Common Stock or VoiceStream preferred stock, as the case may be, set forth
opposite such Stockholder's name on Exhibit A attached hereto (with respect to
each Stockholder, such Stockholder's "Existing Shares" and, together with
record or beneficial ownership of any shares of VoiceStream Common Stock or
other voting capital stock of VoiceStream acquired after the date hereof,
whether upon the exercise of warrants or options, conversion of VoiceStream
preferred stock or any convertible securities or otherwise, such Stockholder's
"Shares"), and/or the number of warrants, options or other rights to acquire or
receive such VoiceStream Common Stock or VoiceStream preferred stock, as the
case may be, set forth opposite such Stockholder's name on Exhibit A attached
hereto (with respect to each Stockholder, such Stockholder's "Existing Rights"
and, together with record or beneficial ownership of any warrants, options or
other rights to acquire or receive such shares of VoiceStream Common Stock or
other voting capital stock of VoiceStream acquired after the date hereof, such
Stockholder's "Rights"). Such Stockholder is the lawful owner of the Existing
Shares and Existing Rights, free and clear of all liens, claims, charges,
security interests or other encumbrances, except as disclosed on Exhibit A. As
of the date hereof, the Existing Shares constitute all of the capital stock of
VoiceStream owned of record or beneficially by such Stockholder (excluding the
Existing Rights) and such Stockholder does not own of record or beneficially,
or have the right to acquire (whether currently, upon lapse of time, following
the satisfaction of any conditions, upon the occurrence of any event or any
combination of the foregoing) any shares of VoiceStream Common Stock or
VoiceStream preferred stock or any other securities convertible into or
exchangeable or exercisable for shares of VoiceStream Common Stock, except
pursuant to the Existing Rights.

                  (b)      Right to Vote. Except as disclosed on Exhibit A,
such Stockholder has, and (subject to the provisions of Section 3(a)) will have
at the VoiceStream Stockholders' Meeting, with respect to all of such
Stockholder's Shares listed on Exhibit A and acquired subsequent to the date
hereof and prior to the record date for the VoiceStream Stockholders' Meeting,
sole voting power, sole power of disposition or sole power to issue
instructions with respect to the matters set forth in Section 4 hereof and to
fulfill its obligations under such Section and shall not take any action or
grant any person any proxy (revocable or irrevocable) or power-of-attorney with
respect to any Shares or Rights inconsistent with his or its obligations as
provided by Section 4 and Section 5 hereof. Each Stockholder hereby revokes any
and all proxies with respect to such Stockholder's Existing Shares to the
extent they are inconsistent with the Stockholders' obligations under this
Agreement.

                  (c)      Authority. Such Stockholder has full legal power,
authority, legal capacity and right to execute and deliver, and to perform its
or his obligations under, this Agreement. No proceedings or actions on the part
of such Stockholder other than those already taken are necessary to authorize
the execution, delivery or performance of this Agreement or the consummation of
the transactions contemplated hereby. This Agreement has been duly and validly
executed and delivered by such Stockholder and constitutes a valid and binding
agreement of such Stockholder enforceable against such Stockholder in
accordance with its terms, subject to (i) bankruptcy, insolvency, moratorium
and other similar laws now or hereafter in effect relating to or affecting
creditors rights generally and (ii) general principles of equity (regardless of
whether considered in a proceeding at law or in equity).

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                  (d)      Conflicting Instruments. Neither the execution and
delivery of this Agreement nor the performance by such Stockholder of its
agreements and obligations hereunder will result in any breach or violation of,
or be in conflict with or constitute a default under, any term of any
agreement, judgment, injunction, order, decree, federal law or regulation to
which such Stockholder is a party or by which such Stockholder (or any of its
assets) is bound.

                  (e)      Powertel's Reliance. Such Stockholder understands
and acknowledges that Powertel is entering into the Powertel Merger Agreement
in reliance upon such Stockholder's execution, delivery and performance of this
Agreement.

                  3.       Restriction on Transfer; Other Restrictions.

                  (a)      From the date hereof until the later of January 1,
2001 and the date of the VoiceStream Stockholders' Meeting, each Stockholder
agrees not to Transfer any Shares or Rights owned of record or beneficially by
such Stockholder, except as otherwise permitted by this Section 3 or pursuant
to the Powertel Merger Agreement or the DT Merger Agreement, Transfers to any
Affiliate of the Stockholder who agrees in writing to be bound by the terms of
this Agreement or Transfers which occur by operation of law if the transferee
remains, or agrees in writing to remain, bound by the terms of this Agreement,
other than, in each case, with Powertel's prior written consent, provided,
however, that this Section 3(a) shall cease to be of any force or effect
immediately upon termination of the Powertel Merger Agreement.

                  (b)      Each Stockholder agrees that if at any time during
the period beginning on the later of January 1, 2001 and the date of the
VoiceStream Stockholders' Meeting and continuing until the first to occur of
(1) the Effective Time and (2) the termination of the Powertel Merger
Agreement, the Stockholders propose to Transfer, or exercise or propose to
exercise registration rights with respect to, more than 25% of the
Stockholders' Shares (individually or in the aggregate with other Transfers
made during such period), such Stockholder will notify the Powertel
stockholders listed on Exhibit B attached hereto ("the "Powertel Stockholders")
in writing at the addresses set forth on Exhibit B at least three Business Days
in advance of such proposed Transfer or exercise of rights, whichever is first
to occur, and shall waive any right of such Stockholder to preclude or delay
the filing of a registration statement or a Transfer by the Powertel
Stockholders with respect to Powertel Stock up to the amounts permitted under
Section 3.3 of such Powertel Stockholders' Powertel Stockholders Agreements
with VoiceStream (as such amounts may be increased by the provisions of such
Section 3.3).

                  (c)      Each Stockholder agrees that if at any time during
the period beginning on the Effective Time through and including the six (6)
month anniversary of the Effective Time, the Stockholders propose to Transfer,
or exercise or propose to exercise registration rights with respect to more
than such number of Shares that the Stockholders are permitted to Transfer
under Rule 144 promulgated under the Securities Act, including the volume
restriction contained therein (individually or in the aggregate with other
Transfers made during such period), such Stockholder will notify the Powertel
Stockholders in writing at least three Business Days in advance of such
proposed Transfer or exercise of rights, whichever is first to occur, and, at
the Stockholders' option, either (i) allow each Powertel Stockholder to include
a proportionate percentage (i.e., a percentage equivalent to the ratio of the
total number of Shares offered for sale

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by the Stockholders to the total number of Shares beneficially owned by the
Stockholders) of the total number of shares of VoiceStream Common Stock
beneficially owned by such Powertel Stockholder in any registration statement
requested to be filed by the Stockholders or (ii) shall waive any right that
such Stockholder may have to preclude or delay the filing of a registration
statement by any of the Powertel Stockholders covering a number of shares up to
that permitted under Section 3.4 of such Powertel Stockholders' Powertel
Stockholders Agreements with VoiceStream (as such number may be increased by
the provisions of Section 3.4).

                  4.       Agreement to Vote. Each Stockholder hereby
irrevocably and unconditionally agrees to vote or to cause to be voted or
provide a consent with respect to, all Shares that he, she or it owns of record
or beneficially as of the record date for the VoiceStream Stockholders' Meeting
at the VoiceStream Stockholders' Meeting and at any other annual or special
meeting of stockholders of VoiceStream or action by written consent where such
matters arise in favor of the Powertel Merger Agreement and, if required, the
other transactions referenced in the Powertel Merger Agreement, and against the
liquidation or winding up of VoiceStream.

                  5.       Delivery of Proxy. In furtherance of the agreements
contained in Section 4 hereof, each Stockholder hereby agrees (a) to complete
and send the proxy card received by such Stockholder with the Joint Proxy
Statement, so that such proxy card is received by VoiceStream, as prescribed by
the Joint Proxy Statement, not later than the fifth Business Day preceding the
day of the VoiceStream Stockholders Meeting, (b) to vote, by completing such
proxy card but not otherwise, all the Shares he, she or it owns of record or
beneficially as of the record date for the VoiceStream Stockholder' Meeting (i)
in favor of the Powertel Merger Agreement and, if required, the other
transactions referenced in the Powertel Merger Agreement and (ii) if the
opportunity to do so is presented to such Stockholder on the proxy card,
against the liquidation or winding up of VoiceStream and (c) not to revoke any
such proxy.

                  6.       Amendment of Existing Voting Agreements. The
Stockholders and certain other stockholders of VoiceStream are parties to a
Voting Agreement dated February 25, 2000 (as amended May 4, 2000), and a
certain First Amended and Restated Voting Agreement dated July 23, 2000 which
will take effect in accordance with its terms (collectively the "Existing
Voting Agreements") pursuant to which they have agreed to vote all shares of
VoiceStream Common Stock and VoiceStream preferred stock beneficially owned by
each of them at the time of such vote in the election of directors in
accordance with the procedures and provisions set forth in such agreements. On
or before the Effective Time, provided that the Stockholders are still subject
to the Existing Voting Agreements, VoiceStream and the Stockholders agree to
execute and deliver, and VoiceStream agrees that it will make commercially
reasonable efforts to cause the other parties to the Existing Voting Agreements
to execute and deliver, an amendment to the Existing Voting Agreements (the
"Amended Voting Agreement") on terms mutually satisfactory to VoiceStream, the
Stockholders, the Powertel Principal Stockholders (who will become parties to
the Amended Voting Agreement), and the other parties who are presently parties
to the Existing Voting Agreements, providing for: (i) the nomination of one
representative of the Powertel stockholders to the VoiceStream Board of
Directors who shall be initially designated by the Powertel Board of Directors
and who shall also be reasonably satisfactory to VoiceStream; (ii) the creation
of a vacancy on the VoiceStream Board of Directors (and the approval of any
Bylaw amendments or other actions required to do so); (iii)

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the appointment of such nominee (and any successor nominee) to a newly created
vacancy on the VoiceStream Board of Directors; and (iv) an agreement to vote
all shares of VoiceStream Common Stock and other voting securities of
VoiceStream (and all securities received in exchange, replacement or
substitution therefore, or as a dividend or result of a stock split with
respect thereto) owned of record or beneficially by the Stockholders at the
time of such vote for such nominee (and any successor nominee) at the first two
annual meetings after the Effective Time. If VoiceStream and the Stockholders
are unable to cause the execution of an Amended Voting Agreement, they shall
execute a separate voting agreement with the Powertel Principal Stockholders
and such other VoiceStream stockholders who agree to enter into such separate
voting agreement on terms and conditions substantially similar to the Existing
Voting Agreements making the same additional provisions as set forth in the
preceding sentence. Prior to the Effective Time, the Powertel Board of
Directors may make such provisions as it deems appropriate for successor
nominees each of which shall be reasonably satisfactory to VoiceStream. After
the Effective Time, any nominee or successor nominee shall be selected by
mutual agreement of ITC Holding Company, Inc., a Delaware corporation
("ITCORP") and SCANA Communications Holdings, Inc., a Delaware corporation
("SCORP") or, if no such agreement can be reached, by whichever of ITCORP and
SCORP beneficially owns the larger number of shares of VoiceStream Common Stock
and VoiceStream preferred stock (on an as-if-converted basis).

                  7.       Additional Shares and Additional Rights. If, after
the date hereof, a Stockholder acquires record or beneficial ownership of any
additional shares of capital stock of VoiceStream (any such shares, "Additional
Shares"), including, without limitation, upon exercise of any option, warrant
or right to acquire shares of capital stock of VoiceStream, through the
conversion of the VoiceStream preferred stock or through any stock dividend or
stock split (any such options, warrants or rights, "Additional Rights"), the
provisions of this Agreement applicable to the Shares shall be applicable to
such Additional Shares and Additional Rights from and after the date of
acquisition thereof. The provisions of the immediately preceding sentence shall
be effective with respect to Additional Shares without action by any Person
immediately upon the acquisition by any Stockholder of record or beneficial
ownership of such Additional Shares or Additional Rights.

                  8.       Miscellaneous.

                  (a)      Entire Agreement. This Agreement constitutes the
entire agreement among the parties with respect to the subject matter hereof.

                  (b)      Costs and Expenses. All costs and expenses incurred
in connection with this Agreement and the transactions contemplated hereby
shall be paid by the party incurring such expenses.

                  (c)      Invalid Provisions. If any provision of this
Agreement shall be invalid or unenforceable under applicable law, such
provision shall be ineffective to the extent of such invalidity or
unenforceability only, without it affecting the remaining provisions of this
Agreement.

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<PAGE>   6

                  (d)      Execution in Counterparts. This Agreement may be
executed in counterparts transmitted and delivered by facsimile each of which
shall be an original with the same effect as if the signatures hereto and
thereto were upon the same instrument.

                  (e)      Specific Performance. Each Stockholder agrees with
Powertel as to himself or itself that if for any reason such Stockholder fails
to perform any of his or its agreements or obligations under this Agreement,
irreparable harm or injury to Powertel would be caused as to which money
damages would not be an adequate remedy. Accordingly, each Stockholder agrees
that, in seeking to enforce this Agreement against such Stockholder, Powertel
shall be entitled, in addition to any other remedy available at law, equity or
otherwise, to specific performance and injunctive and other equitable relief.
The provisions of this Section 8(e) are without prejudice to any other rights
or remedies, whether at law or in equity, that Powertel may have against such
Stockholder for any failure to perform any of its agreements or obligations
under this Agreement.

                  (f)      Amendments; Termination.

                           (i)      This Agreement, including this Section
         8(f), may not be modified, amended, altered or supplemented, except
         upon the execution and delivery of a written agreement executed by the
         parties hereto.

                           (ii)     The provisions of this Agreement (other
         than Sections 3, 4 and 6) shall terminate upon the earliest to occur
         of (A) the consummation of the Merger, (B) the date that is two (2)
         years after the date hereof, and (C) the termination of the Merger
         Agreement. The provisions of Sections 3(a), 3(b) and 4 of this
         Agreement shall terminate when the applicable time periods set forth
         in Section 3 lapse, and the provisions of Section 3(c) shall terminate
         on the earlier of the six (6) month anniversary of the Effective Time
         or upon the termination of the Powertel Merger Agreement. The
         provisions of Section 6 shall terminate upon earlier of the execution
         and delivery of a new or amended voting agreement or the termination
         of the Powertel Merger Agreement.

                  (g)      Governing Law; Submission and Jurisdiction.

                           (i)      This Agreement shall be governed by and
         construed in accordance with the laws of the State of Delaware without
         giving effect to the principles of conflicts of laws thereof.

                           (ii)     Each of the parties hereto irrevocably
         agrees that any legal action or proceeding with respect to this
         Agreement or for recognition and enforcement of any judgment in
         respect hereof brought by the other party hereto or its successors or
         assigns shall be brought and determined only in the United States
         District Court for the State of Delaware or, in the event (but only in
         the event) that such court does not have subject matter jurisdiction
         over such action or proceeding, in the courts of the State of
         Delaware. Each of the parties hereto hereby irrevocable submits with
         regard to any such action or proceeding for itself and in respect to
         its property, generally and unconditionally, to the personal
         jurisdiction of the aforesaid courts. Each of the parties hereto
         hereby irrevocably waives, and agrees not to assert, by way of motion,
         as a defense,

                                       6
<PAGE>   7

         counterclaim or otherwise, in any action or proceeding with respect to
         this Agreement, (A) any claim that it is not personally subject to the
         jurisdiction of the above-named courts for any reason other than the
         failure to serve in accordance with this Section 8(g)(ii) or that it
         or its property is exempt or immune from jurisdiction of any such
         court or from any legal process commenced in such courts (whether
         through service of notice, attachment prior to judgment, attachment in
         aid of execution of judgment, execution of judgment or otherwise), and
         (B) to the fullest extent permitted by the applicable law, that (x)
         the suit, action or proceeding in such court is brought in an
         inconvenient forum, (y) the venue of such suit, action or proceeding
         is improper and (z) this Agreement, or the subject matter hereof, may
         not be enforced in or by such courts. Without limiting the foregoing,
         each party agrees that service of process on such party as provided in
         Section 8(i) shall be deemed effective service of process on such
         party.

                  (h)      Successors and Assigns. The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective legal successors (including, in the case of such
Stockholder or any other individual, any executors, administrators, estates,
legal representatives and heirs of such Stockholder or such individual) and
permitted assigns; provided that, except as otherwise provided in this
Agreement, no party may assign, delegate or otherwise transfer any of its
rights or obligations under this Agreement.

                  (i)      Notices. All notices and other communications given
or made pursuant hereto shall be in writing and shall be deemed to have been
duly given or made as of the date of receipt and shall be delivered personally
or sent by overnight courier or sent by telecopy, to the Parties at the
following addresses or telecopy numbers (or at such other address or telecopy
number for a party as shall be specified by like notice):

                           (i)      if to a Stockholder, at such Stockholder's
         address appearing on Exhibit A hereto or at any other address that
         such Stockholder may have provided in writing to Powertel and the
         other Stockholders,

                           with a copy to:

                                    Preston Gates & Ellis LLP
                                    701 Fifth Avenue, Suite 5000
                                    Seattle, WA  98104
                                    Attn: Richard B. Dodd, Esq.
                                    Telecopy No: 206-623-7022

                           And a copy to:

                                    Friedman, Kaplan & Seiler LLP
                                    875 Third Avenue
                                    New York, New York  10022
                                    Attention: Barry A. Adelman
                                    Facsimile: 212-355-6401

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<PAGE>   8

                           (ii)     if to Powertel:

                                    Powertel, Inc.
                                    1239 O.G. Skinner Drive
                                    West Point, GA  31833
                                    Attention:  Chairman of the Board
                                    Facsimile:  706-645-9563

                           with a copy to:

                                    Morris Manning & Martin, L.L.P.
                                    1600 Atlanta Financial Center
                                    3343 Peachtree Road, NE
                                    Atlanta, Georgia  30326
                                    Attention: James Walker IV
                                    Facsimile: 404-365-9532

                  (j)      Waiver of Immunity. Stockholder agrees that, to the
extent that it or any of its property is or becomes entitled at any time to any
immunity on the grounds of sovereignty or otherwise based upon its status as an
agency or instrumentality of government from any legal action, suit or
proceeding or from setoff or counterclaim relating to this Agreement from the
jurisdiction of any competent court, from service of process, from attachment
prior to judgment, from attachment in aid of execution of a judgment, from
execution pursuant to a judgment or arbitral award, or from any other legal
process in any jurisdiction, it, for itself and its property expressly,
irrevocably and unconditionally waives, and agrees not to plead or claim, any
such immunity with respect to such matters arising with respect to this
Agreement or the subject matter hereof (including any obligation for the
payment of money). Stockholder agrees that the waiver in this provision is
irrevocable and is not subject to withdrawal in any jurisdiction or under any
statute, including the Foreign Sovereign Immunities Act, 28 U.S.C. ss. 1602 et
seq. The foregoing waiver shall constitute a present waiver of immunity at any
time any action is initiated against Stockholder with respect to this
Agreement.

                  (k)      Third Party Beneficiaries. This Agreement is entered
into solely for the benefit of the parties hereto and no person other than such
parties, and their respective successors and permitted assigns to the extent
expressly provided herein, may exercise any right or enforce any obligation
hereunder; provided, however, that the Powertel Stockholders shall be deemed to
be third party beneficiaries of this Agreement solely with respect to the
notification provisions contained in Sections 3(b) and 3(c) hereof.

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                  STOCKHOLDERS SIGNATURE PAGE  -  SONERA

                  IN WITNESS WHEREOF, the parties hereto have executed this
VoiceStream Stockholders Agreement as of this 26th day of August, 2000.

                                              VOICESTREAM WIRELESS CORPORATION

                                              By: /s/ Cregg Baumbaugh
                                                  -----------------------------
                                                  Name:  Cregg Baumbaugh
                                                  Title: Executive Vice
                                                         President --
                                                         Finance, Strategy
                                                           and Development

                                              POWERTEL, INC.

                                              By: /s/ Allen E. Smith
                                                  -----------------------------
                                                  Name:  Allen E. Smith
                                                  Title: President and
                                                         Chief Executive
                                                         Officer

                                              SONERA CORPORATION

                                              By: /s/ Olli T. Tuohimaa
                                                  -----------------------------
                                                  Name:  Olli T. Tuohimaa
                                                  Title: General Counsel of
                                                         Sonera Corp. U.S.,
                                                         Attorney-in-Fact

                                              SONERA HOLDING B.V.

                                              By: /s/ Olli T. Tuohimaa
                                                  -----------------------------
                                                  Name:  Olli T. Tuohimaa
                                                  Title: General Counsel of
                                                         Sonera Corp. U.S.,
                                                         Attorney-in-Fact

                                       9
<PAGE>   10

                                                                      EXHIBIT A

<TABLE>
<CAPTION>
Stockholder Name and Address                   Number of Existing Shares
----------------------------                   -------------------------
<S>                                            <C>
Sonera Corporation                                10,203,843
P.O. Box 106
FIN-00051-SONERA
Teollisuuskatu 15, Helsinki
Attn: Kaj-Erik Relander,
Deputy Chief Executive Officer
Facsimile: 011 358 2040 3770

Sonera Holding, B.V.                              8,771,930
c/o Sonera Corporation
P.O. Box 106
FIN-00051-SONERA
Teollisuuskatu 15, Helsinki
Attn: Kaj-Erik Relander,
Deputy Chief Executive Officer
Facsimile: 011 358 2040 3770

Total                                             18,975,773
                                                  ----------
</TABLE>

The Shares listed above are subject to a Stockholders Agreement executed among
the Stockholders and Deutsche Telekom AG, dated as of July 23, 2000, and an
Investor Agreement among Sonera Ltd. and VoiceStream Wireless Corporation,
dated as of September 17, 1999.

<PAGE>   11

                                                                      EXHIBIT B

                             POWERTEL STOCKHOLDERS

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------
<S>                                        <C>
ITC Holding Corporation, Inc.              614 West Bay Street
ITC Service Company                        Tampa, FL  33606-2704
ITC Wireless, Inc.
3300 20th Avenue                           ABOVE ADDRESS FOR THE FOLLOWING STOCKHOLDERS:
Valley, AL  36854
                                           Donald W. Burton
----------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------
Sonera Holding, B.V.                       The Burton Partnership, L.P., Donald W. Burton, General
c/o Sonera Corporation                     Partner
P.O. Box 106
FIN-00051-SONERA                           The Burton Partnership (QP), L.P., Donald W. Burton,
Teollisuuskatu 15, Helsinki                General Partner
Attn: Kaj-Erik Relander,
Deputy Chief Executive Officer
Facsimile: 011 358 2040 3770
----------------------------------------------------------------------------------------------------
Sonera Corporation                         South Atlantic Venture Fund II, L.P., South Atlantic
P.O. Box 106                               Venture Partners II, L.P., general partner, of which
FIN-00051-SONERA                           Mr. Burton is managing general partner
Teollisuuskatu 15, Helsinki
Attn: Kaj-Erik Relander,                   South Atlantic Venture Fund III, L.P.; South Atlantic
Deputy Chief Executive Officer             Partners III, L.P., sole general partner, of which Mr.
Facsimile: 011 358 2040 3770               Burton is chairman
----------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------
                                           South Atlantic Private Equity Fund IV, L.P.; South
SCANA Communications Holdings, Inc.        Atlantic Private Equity  Partners IV, sole general
Delaware Avenue, Suite 510                 partner, of which Mr. Burton is chairman
Wilmington, DE 19801-1622
----------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------
American Water Works Company                South Atlantic Private Equity Fund IV (QP) L.P.;
South PO Box 1770                           Atlantic Private Equity Partners IV, Inc., sole general
Voorhees, NJ 08043                          partner, of which Mr. Burton is chairman
----------------------------------------------------------------------------------------------------
</TABLE><PAGE>   1
                                                                    EXHIBIT 10.3

                                                         GOLDMAN SACHS AGREEMENT
                                                                  EXECUTION COPY

                       VOICESTREAM STOCKHOLDERS AGREEMENT

                  This VoiceStream Stockholders Agreement (this "Agreement")
dated as of August 26, 2000 among Powertel, Inc., a Delaware corporation
("Powertel"), each of the stockholders of VoiceStream listed on the signature
page hereto (each, a "Stockholder"), and VoiceStream Wireless Corporation, a
Delaware corporation ("VoiceStream") solely for purposes of Section 6.

                  WHEREAS, simultaneously with the execution of this Agreement,
VoiceStream and Powertel are entering into an Agreement and Plan of Merger (the
"Powertel Merger Agreement"), dated as of the date hereof, providing, among
other things, for the merger of a subsidiary of VoiceStream with and into
Powertel (the "Merger");

                  WHEREAS, Powertel has agreed to enter into the Powertel Merger
Agreement only if the VoiceStream Principal Stockholders enter into a
VoiceStream Voting Agreement, including this Agreement;

                  WHEREAS, in the Powertel Merger Agreement VoiceStream has
agreed, subject to the conditions set forth therein, to acquire all of the
shares of Powertel Common Stock (as defined below);

                  NOW THEREFORE, in consideration of the foregoing and the
mutual premises, representations, warranties, covenants and agreements contained
herein and in the Merger Agreement, the parties hereto, intending to be legally
bound hereby, agree as follows:

                  1.       Certain Definitions.

                  This Agreement is one of the VoiceStream Voting Agreements
referenced in the recitals to the Powertel Merger Agreement. For the purposes of
this Agreement, all capitalized terms used but not otherwise defined herein
shall have the respective meanings given to such terms in the Powertel Merger
Agreement.

                  For the purposes of this Agreement, the words "beneficially
owned" or "beneficial ownership" shall include, with respect to any securities,
the beneficial ownership by a Stockholder and by any direct or indirect
Subsidiary of a Stockholder; except that no broker or dealer or any Affiliate
thereof shall be deemed to beneficially own, or own of record, any securities
the beneficial ownership of which is acquired in the ordinary course of the
activities of a broker or dealer registered under Section 15 of the Exchange
Act, including, but not limited to, the acquisition of record or beneficial
ownership of such securities as a result of any market-making or underwriting
activities (including any securities acquired for the investment account of a
broker or dealer in connection with such underwriting activities), or the
exercise of investment or voting discretion authority over any of its customer
accounts, or the acquisition in good faith of such securities in connection with
the enforcement of payment of a debt previously contracted, or those owned by
customer managed accounts, mutual funds, exchange funds or similar investment
funds.
<PAGE>   2

                  "Transfer" means, with respect to any security, the sale,
transfer, pledge, hypothecation, encumbrance, assignment or other disposition of
such security or the record or beneficial ownership thereof, the offer to make
such a sale, transfer or other disposition, and each agreement, arrangement or
understanding, whether or not in writing, to effect any of the foregoing.

                  2.       Representations; Warranties and Covenants of Each
Stockholder. Each Stockholder hereby represents and warrants, severally and not
jointly, to Powertel, solely with respect to itself, as follows:

                  (a)      Title. As of the date hereof, such Stockholder is the
sole record or beneficial owner of the number of shares of VoiceStream Common
Stock or VoiceStream preferred stock, as the case may be, set forth opposite
such Stockholder's name on Exhibit A attached hereto (with respect to each
Stockholder, such Stockholder's "Existing Shares" and, together with record or
beneficial ownership of any shares of VoiceStream Common Stock or other voting
capital stock of VoiceStream acquired after the date hereof, whether upon the
exercise of warrants or options, conversion of VoiceStream preferred stock or
any convertible securities or otherwise, such Stockholder's "Shares"), and/or
the number of warrants, options or other rights to acquire or receive such
VoiceStream Common Stock or VoiceStream preferred stock, as the case may be, set
forth opposite such Stockholder's name on Exhibit A attached hereto (with
respect to each Stockholder, such Stockholder's "Existing Rights" and, together
with record or beneficial ownership of any warrants, options or other rights to
acquire or receive such shares of VoiceStream Common Stock or other voting
capital stock of VoiceStream acquired after the date hereof, such Stockholder's
"Rights"). Such Stockholder is the lawful owner of the Existing Shares and
Existing Rights, free and clear of all liens, claims, charges, security
interests or other encumbrances, except as disclosed on Exhibit A. As of the
date hereof, the Existing Shares constitute all of the capital stock of
VoiceStream owned of record or beneficially by such Stockholder (excluding the
Existing Rights) and such Stockholder does not own of record or beneficially, or
have the right to acquire (whether currently, upon lapse of time, following the
satisfaction of any conditions, upon the occurrence of any event or any
combination of the foregoing) any shares of VoiceStream Common Stock or
VoiceStream preferred stock or any other securities convertible into or
exchangeable or exercisable for shares of VoiceStream Common Stock, except
pursuant to the Existing Rights.

                  (b)      Right to Vote. Except as disclosed on Exhibit A, such
Stockholder has, and (subject to the provisions of Section 3(a)) will have at
the VoiceStream Stockholders' Meeting, with respect to all of such Stockholder's
Shares listed on Exhibit A and acquired subsequent to the date hereof and prior
to the record date for the VoiceStream Stockholders' Meeting, sole voting power,
sole power of disposition or sole power to issue instructions with respect to
the matters set forth in Section 4 hereof and to fulfill its obligations under
such Section and shall not take any action or grant any person any proxy
(revocable or irrevocable) or power-of-attorney with respect to any Shares or
Rights inconsistent with his or its obligations as provided by Section 4 and
Section 5 hereof. Each Stockholder hereby revokes any and all proxies with
respect to such Stockholder's Existing Shares to the extent they are
inconsistent with the Stockholders' obligations under this Agreement.

                                       2
<PAGE>   3

                  (c)      Authority. Such Stockholder has full legal power,
authority, legal capacity and right to execute and deliver, and to perform its
or his obligations under, this Agreement. No proceedings or actions on the part
of such Stockholder other than those already taken are necessary to authorize
the execution, delivery or performance of this Agreement or the consummation of
the transactions contemplated hereby. This Agreement has been duly and validly
executed and delivered by such Stockholder and constitutes a valid and binding
agreement of such Stockholder enforceable against such Stockholder in accordance
with its terms, subject to (i) bankruptcy, insolvency, moratorium and other
similar laws now or hereafter in effect relating to or affecting creditors
rights generally and (ii) general principles of equity (regardless of whether
considered in a proceeding at law or in equity).

                  (d)      Conflicting Instruments. Neither the execution and
delivery of this Agreement nor the performance by such Stockholder of its
agreements and obligations hereunder will result in any breach or violation of,
or be in conflict with or constitute a default under, any term of any agreement,
judgment, injunction, order, decree, federal law or regulation to which such
Stockholder is a party or by which such Stockholder (or any of its assets) is
bound.

                  (e)      Powertel's Reliance. Such Stockholder understands and
acknowledges that Powertel is entering into the Powertel Merger Agreement in
reliance upon such Stockholder's execution, delivery and performance of this
Agreement.

                  3.       Restriction on Transfer; Other Restrictions.

                  (a)      From the date hereof until the later of January 1,
2001 and the date of the VoiceStream Stockholders' Meeting, each Stockholder
agrees not to Transfer any Shares or Rights owned of record or beneficially by
such Stockholder, except as otherwise permitted by this Section 3 or pursuant to
the Powertel Merger Agreement or the DT Merger Agreement, Transfers to any
Affiliate of the Stockholder who agrees in writing to be bound by the terms of
this Agreement or Transfers which occur by operation of law if the transferee
remains, or agrees in writing to remain, bound by the terms of this Agreement,
other than, in each case, with Powertel's prior written consent, provided,
however, that this Section 3(a) shall cease to be of any force or effect
immediately upon termination of the Powertel Merger Agreement.

                  (b)      Each Stockholder agrees that if at any time during
the period beginning on the later of January 1, 2001 and the date of the
VoiceStream Stockholders' Meeting and continuing until the first to occur of (1)
the Effective Time and (2) the termination of the Powertel Merger Agreement, the
Stockholders propose to Transfer, or exercise or propose to exercise
registration rights with respect to, more than 25% of the Stockholders' Shares
(individually or in the aggregate with other Transfers made during such period),
such Stockholder will notify the Powertel stockholders listed on Exhibit B
attached hereto ("the "Powertel Stockholders") in writing at the addresses set
forth on Exhibit B at least three Business Days in advance of such proposed
Transfer or exercise of rights, whichever is first to occur, and shall waive any
right of such Stockholder to preclude or delay the filing of a registration
statement or a Transfer by the Powertel Stockholders with respect to Powertel
Stock up to the amounts permitted under Section 3.3 of such Powertel
Stockholders' Powertel Stockholders Agreements with VoiceStream (as such amounts
may be increased by the provisions of such Section 3.3).

                                       3
<PAGE>   4

                  (c)      Each Stockholder agrees that if at any time during
the period beginning on the Effective Time through and including the six (6)
month anniversary of the Effective Time, the Stockholders propose to Transfer,
or exercise or propose to exercise registration rights with respect to more than
such number of Shares that the Stockholders are permitted to Transfer under Rule
144 promulgated under the Securities Act, including the volume restriction
contained therein (individually or in the aggregate with other Transfers made
during such period), such Stockholder will notify the Powertel Stockholders in
writing at least three Business Days in advance of such proposed Transfer or
exercise of rights, whichever is first to occur, and, at the Stockholders'
option, either (i) allow each Powertel Stockholder to include a proportionate
percentage (i.e., a percentage equivalent to the ratio of the total number of
Shares offered for sale by the Stockholders to the total number of Shares
beneficially owned by the Stockholders) of the total number of shares of
VoiceStream Common Stock beneficially owned by such Powertel Stockholder in any
registration statement requested to be filed by the Stockholders or (ii) shall
waive any right that such Stockholder may have to preclude or delay the filing
of a registration statement by any of the Powertel Stockholders covering a
number of shares up to that permitted under Section 3.4 of such Powertel
Stockholders' Powertel Stockholders Agreements with VoiceStream (as such number
may be increased by the provisions of such Section 3.4).

                  4.       Agreement to Vote. Each Stockholder hereby
irrevocably and unconditionally agrees to vote or to cause to be voted or
provide a consent with respect to, all Shares that he, she or it owns of record
or beneficially as of the record date for the VoiceStream Stockholders' Meeting
at the VoiceStream Stockholders' Meeting and at any other annual or special
meeting of stockholders of VoiceStream or action by written consent where such
matters arise in favor of the Powertel Merger Agreement and, if required, the
other transactions referenced in the Powertel Merger Agreement, and against the
liquidation or winding up of VoiceStream.

                  5.       Delivery of Proxy. In furtherance of the agreements
contained in Section 4 hereof, each Stockholder hereby agrees (a) to complete
and send the proxy card received by such Stockholder with the Joint Proxy
Statement, so that such proxy card is received by VoiceStream, as prescribed by
the Joint Proxy Statement, not later than the fifth Business Day preceding the
day of the VoiceStream Stockholders Meeting, (b) to vote, by completing such
proxy card but not otherwise, all the Shares he, she or it owns of record or
beneficially as of the record date for the VoiceStream Stockholder' Meeting (i)
in favor of the Powertel Merger Agreement and, if required, the other
transactions referenced in the Powertel Merger Agreement and (ii) if the
opportunity to do so is presented to such Stockholder on the proxy card, against
the liquidation or winding up of VoiceStream and (c) not to revoke any such
proxy.

                  6.       Amendment of Existing Voting Agreements. The
Stockholders and certain other stockholders of VoiceStream are parties to a
Voting Agreement dated February 25, 2000 (as amended May 4, 2000), and a certain
First Amended and Restated Voting Agreement dated July 23, 2000 which will take
effect in accordance with its terms (collectively the "Existing Voting
Agreements") pursuant to which they have agreed to vote all shares of
VoiceStream Common Stock and VoiceStream preferred stock beneficially owned by
each of them at the time of such vote in the election of directors in accordance
with the procedures and provisions set forth in such agreements. On or before
the Effective Time, provided that the Stockholders are still subject to the
Existing Voting Agreements, VoiceStream and the Stockholders agree to

                                       4
<PAGE>   5

execute and deliver, and VoiceStream agrees that it will make commercially
reasonable efforts to cause the other parties to the Existing Voting Agreements
to execute and deliver, an amendment to the Existing Voting Agreements (the
"Amended Voting Agreement") on terms mutually satisfactory to VoiceStream, the
Stockholders, the Powertel Principal Stockholders (who will become parties to
the Amended Voting Agreement), and the other parties who are presently parties
to the Existing Voting Agreements, providing for: (i) the nomination of one
representative of the Powertel stockholders to the VoiceStream Board of
Directors who shall be initially designated by the Powertel Board of Directors
and who shall also be reasonably satisfactory to VoiceStream; (ii) the creation
of a vacancy on the VoiceStream Board of Directors (and the approval of any
Bylaw amendments or other actions required to do so); (iii) the appointment of
such nominee (and any successor nominee) to a newly created vacancy on the
VoiceStream Board of Directors; and (iv) an agreement to vote all shares of
VoiceStream Common Stock and other voting securities of VoiceStream (and all
securities received in exchange, replacement or substitution therefore, or as a
dividend or result of a stock split with respect thereto) owned of record or
beneficially by the Stockholders at the time of such vote for such nominee (and
any successor nominee) at the first two annual meetings after the Effective
Time. If VoiceStream and the Stockholders are unable to cause the execution of
an Amended Voting Agreement, they shall execute a separate voting agreement with
the Powertel Principal Stockholders and such other VoiceStream stockholders who
agree to enter into such separate voting agreement on terms and conditions
substantially similar to the Existing Voting Agreements making the same
additional provisions as set forth in the preceding sentence. Prior to the
Effective Time, the Powertel Board of Directors may make such provisions as it
deems appropriate for successor nominees each of which shall be reasonably
satisfactory to VoiceStream. After the Effective Time, any nominee or successor
nominee shall be selected by mutual agreement of ITC Holding Company, Inc., a
Delaware corporation ("ITCORP") and SCANA Communications Holdings, Inc., a
Delaware corporation ("SCORP") or, if no such agreement can be reached, by
whichever of ITCORP and SCORP beneficially owns the larger number of shares of
VoiceStream Common Stock and VoiceStream preferred stock (on an as-if-converted
basis).

                  7.       Additional Shares and Additional Rights. If, after
the date hereof, a Stockholder acquires record or beneficial ownership of any
additional shares of capital stock of VoiceStream (any such shares, "Additional
Shares"), including, without limitation, upon exercise of any option, warrant or
right to acquire shares of capital stock of VoiceStream, through the conversion
of the VoiceStream preferred stock or through any stock dividend or stock split
(any such options, warrants or rights, "Additional Rights"), the provisions of
this Agreement applicable to the Shares shall be applicable to such Additional
Shares and Additional Rights from and after the date of acquisition thereof. The
provisions of the immediately preceding sentence shall be effective with respect
to Additional Shares without action by any Person immediately upon the
acquisition by any Stockholder of record or beneficial ownership of such
Additional Shares or Additional Rights.

                  8.       Miscellaneous.

                  (a)      Entire Agreement. This Agreement constitutes the
entire agreement among the parties with respect to the subject matter hereof.

                                       5
<PAGE>   6

                  (b)      Costs and Expenses. All costs and expenses incurred
in connection with this Agreement and the transactions contemplated hereby shall
be paid by the party incurring such expenses.

                  (c)      Invalid Provisions. If any provision of this
Agreement shall be invalid or unenforceable under applicable law, such provision
shall be ineffective to the extent of such invalidity or unenforceability only,
without it affecting the remaining provisions of this Agreement.

                  (d)      Execution in Counterparts. This Agreement may be
executed in counterparts transmitted and delivered by facsimile each of which
shall be an original with the same effect as if the signatures hereto and
thereto were upon the same instrument.

                  (e)      Specific Performance. Each Stockholder agrees with
Powertel as to himself or itself that if for any reason such Stockholder fails
to perform any of his or its agreements or obligations under this Agreement,
irreparable harm or injury to Powertel would be caused as to which money damages
would not be an adequate remedy. Accordingly, each Stockholder agrees that, in
seeking to enforce this Agreement against such Stockholder, Powertel shall be
entitled, in addition to any other remedy available at law, equity or otherwise,
to specific performance and injunctive and other equitable relief. The
provisions of this Section 8(e) are without prejudice to any other rights or
remedies, whether at law or in equity, that Powertel may have against such
Stockholder for any failure to perform any of its agreements or obligations
under this Agreement.

                  (f)      Amendments; Termination.

                           (i)      This Agreement, including this Section 8(f),
         may not be modified, amended, altered or supplemented, except upon the
         execution and delivery of a written agreement executed by the parties
         hereto.

                           (ii)     The provisions of this Agreement (other than
         Sections 3, 4 and 6) shall terminate upon the earliest to occur of (A)
         the consummation of the Merger, (B) the date that is two (2) years
         after the date hereof, and (C) the termination of the Merger Agreement.
         The provisions of Sections 3(a), 3(b) and 4 of this Agreement shall
         terminate when the applicable time periods set forth in Section 3
         lapse, and the provisions of Section 3(c) shall terminate on the
         earlier of the six (6) month anniversary of the Effective Time or upon
         the termination of the Powertel Merger Agreement. The provisions of
         Section 6 shall terminate upon earlier of the execution and delivery of
         a new or amended voting agreement or the termination of the Powertel
         Merger Agreement.

                  (g)      Governing Law; Submission and Jurisdiction.

                           (i)      This Agreement shall be governed by and
         construed in accordance with the laws of the State of Delaware without
         giving effect to the principles of conflicts of laws thereof.

                           (ii)     Each of the parties hereto irrevocably
         agrees that any legal action or proceeding with respect to this
         Agreement or for recognition and enforcement of any

                                       6
<PAGE>   7

         judgment in respect hereof brought by the other party hereto or its
         successors or assigns shall be brought and determined only in the
         United States District Court for the State of Delaware or, in the event
         (but only in the event) that such court does not have subject matter
         jurisdiction over such action or proceeding, in the courts of the State
         of Delaware. Each of the parties hereto hereby irrevocable submits with
         regard to any such action or proceeding for itself and in respect to
         its property, generally and unconditionally, to the personal
         jurisdiction of the aforesaid courts. Each of the parties hereto hereby
         irrevocably waives, and agrees not to assert, by way of motion, as a
         defense, counterclaim or otherwise, in any action or proceeding with
         respect to this Agreement, (A) any claim that it is not personally
         subject to the jurisdiction of the above-named courts for any reason
         other than the failure to serve in accordance with this Section
         8(g)(ii) or that it or its property is exempt or immune from
         jurisdiction of any such court or from any legal process commenced in
         such courts (whether through service of notice, attachment prior to
         judgment, attachment in aid of execution of judgment, execution of
         judgment or otherwise), and (B) to the fullest extent permitted by the
         applicable law, that (x) the suit, action or proceeding in such court
         is brought in an inconvenient forum, (y) the venue of such suit, action
         or proceeding is improper and (z) this Agreement, or the subject matter
         hereof, may not be enforced in or by such courts. Without limiting the
         foregoing, each party agrees that service of process on such party as
         provided in Section 8(i) shall be deemed effective service of process
         on such party.

                  (h)      Successors and Assigns. The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective legal successors (including, in the case of such
Stockholder or any other individual, any executors, administrators, estates,
legal representatives and heirs of such Stockholder or such individual) and
permitted assigns; provided that, except as otherwise provided in this
Agreement, no party may assign, delegate or otherwise transfer any of its rights
or obligations under this Agreement.

                  (i)      Notices. All notices and other communications given
or made pursuant hereto shall be in writing and shall be deemed to have been
duly given or made as of the date of receipt and shall be delivered personally
or sent by overnight courier or sent by telecopy, to the Parties at the
following addresses or telecopy numbers (or at such other address or telecopy
number for a party as shall be specified by like notice):

                           (i)      if to a Stockholder, at such Stockholder's
         address appearing on Exhibit A hereto or at any other address that such
         Stockholder may have provided in writing to Powertel and the other
         Stockholders,

                           with a copy to:

                                    Preston Gates & Ellis LLP
                                    701 Fifth Avenue, Suite 5000
                                    Seattle, WA  98104
                                    Attn: Richard B. Dodd, Esq.
                                    Telecopy No: 206-623-7022

                                       7
<PAGE>   8

                           And a copy to:

                                    Friedman, Kaplan & Seiler LLP
                                    875 Third Avenue
                                    New York, New York  10022
                                    Attention: Barry A. Adelman
                                    Facsimile: 212-355-6401

                           (ii)     if to Powertel:

                                    Powertel, Inc.
                                    1239 O.G. Skinner Drive
                                    West Point, GA  31833
                                    Attention:  Chairman of the Board
                                    Facsimile:  706-645-9563

                           with a copy to:

                                    Morris Manning & Martin, L.L.P.
                                    1600 Atlanta Financial Center
                                    3343 Peachtree Road, NE
                                    Atlanta, Georgia  30326
                                    Attention: James Walker IV
                                    Facsimile: 404-365-9532

                  (j)      Third Party Beneficiaries. This Agreement is entered
into solely for the benefit of the parties hereto and no person other than such
parties, and their respective successors and permitted assigns to the extent
expressly provided herein, may exercise any right or enforce any obligation
hereunder; provided, however, that the Powertel Stockholders shall be deemed to
be third party beneficiaries of this Agreement solely with respect to the
notification provisions contained in Sections 3(b) and 3(c) hereof.

                                       8
<PAGE>   9

                   STOCKHOLDERS SIGNATURE PAGE - GOLDMAN SACHS

                  IN WITNESS WHEREOF, the parties hereto have executed this
VoiceStream Stockholders Agreement as of this 26th day of August, 2000.

                                            VOICESTREAM WIRELESS CORPORATION

                                            By: /s/ Cregg Baumbaugh
                                                --------------------------------
                                                Name:  Cregg Baumbaugh
                                                Title: Executive Vice
                                                       President -- Finance,
                                                       Strategy and
                                                       Development

                                            POWERTEL, INC.

                                            By:  /s/ Allen E. Smith
                                                --------------------------------
                                                Name:  Allen E. Smith
                                                Title: President and Chief
                                                       Executive Officer

                                            GS CAPITAL PARTNERS, L.P.

                                             By: GS Advisors,
                                                 L.L.C., its general partner

                                            By:  /s/ Katherine L. Nissenbaum
                                                --------------------------------
                                                Name:  Katherine L. Nissenbaum
                                                Title: Vice President

                                            THE GOLDMAN SACHS GROUP, INC.

                                            By:  /s/ Terence M. O'Toole
                                                --------------------------------
                                                Name:  Terence M. O'Toole
                                                Title: Attorney-in-Fact

                                            BRIDGE STREET FUND 1992, L.P.

                                            By: Stone Street 1992, LLC, its
                                                general partner

                                            By:  /s/ Katherine L. Nissenbaum
                                                --------------------------------
                                                Name:  Katherine L. Nissenbaum
                                                Title: Vice President

                                       9
<PAGE>   10

                                            STONE STREET FUND 1992, L.P.
                                            By: Stone Street 1992,
                                                L.L.C., its general
                                                partner

                                            By:   /s/ Katherine L. Nissenbaum
                                                --------------------------------
                                                Name: Katherine L. Nissenbaum
                                                Title: Vice President

                                       10
<PAGE>   11

                                                                       EXHIBIT A

<TABLE>
<CAPTION>
                                                                                Number and Description of
Stockholder Name and Address                   Number of Existing Shares             Existing Rights
----------------------------                   -------------------------        -------------------------

<S>                                            <C>                              <C>
GS Capital Partners, L.P.                             8,986,738
c/o Goldman, Sachs & Co.
85 Broad Street
New York, NY 10004
Attention: Terence O'Toole
Fax: 212-902-3000

The Goldman Sachs Group, Inc.                            68,821
c/o Goldman, Sachs & Co.
85 Broad Street
New York, NY 10004
Attention: Terence O'Toole
Fax: 212-357-5505

Bridge Street Fund 1992, L.P.                           273,069
c/o Goldman, Sachs & Co.
85 Broad Street
New York, NY 10004
Attention: Terence O'Toole
Fax: 212-357-5505

Stone Street Fund 1992, L.P.                            470,401
c/o Goldman, Sachs & Co.
85 Broad Street
New York, NY 10004
Attention: Terence O'Toole
Fax: 212-357-5505
                                                      9,799,029
                                                      ---------
</TABLE>

The Shares listed above are subject to a Stockholders Agreement executed among
the Stockholders and Deutsche Telekom AG, dated as of July 23, 2000.

<PAGE>   12

                                                                       EXHIBIT B

                              POWERTEL STOCKHOLDERS

<TABLE>
<S>                                      <C>
ITC Holding Corporation, Inc.            614 West Bay Street
ITC Service Company                      Tampa, FL  33606-2704
ITC Wireless, Inc.
3300 20th Avenue                         ABOVE ADDRESS FOR THE FOLLOWING
Valley, AL  36854                        STOCKHOLDERS:

                                         Donald W. Burton

Sonera Holding, B.V.                     The Burton Partnership, L.P., Donald W.
c/o Sonera Corporation                   Burton, General Partner
P.O. Box 106
FIN-00051-SONERA                         The Burton Partnership (QP), L.P., Donald W.
Teollisuuskatu 15, Helsinki              Burton, General Partner
Attn: Kaj-Erik Relander,
Deputy Chief Executive Officer
Facsimile: 011 358 2040 3770

Sonera Corporation                       South Atlantic Venture Fund II, L.P., South
P.O. Box 106                             Atlantic Venture Partners II, L.P., general
FIN-00051-SONERA                         partner, of which Mr. Burton is managing
Teollisuuskatu 15, Helsinki              general partner
Attn: Kaj-Erik Relander,
Deputy Chief Executive Officer           South Atlantic Venture Fund III, L.P.; South
Facsimile: 011 358 2040 3770             Atlantic Partners III, L.P., sole general partner,
                                         of which Mr. Burton is chairman

                                         South Atlantic Private Equity Fund IV, L.P.;
SCANA Communications Holdings, Inc.      South Atlantic Private Equity Partners IV, sole
Delaware Avenue, Suite 510               general partner, of which Mr. Burton is
Wilmington, DE 19801-1622                chairman

American Water Works Company             South Atlantic Private Equity Fund IV (QP)
South PO Box 1770                        L.P.; Atlantic Private Equity Partners
Voorhees, NJ 08043                       IV, Inc., sole general partner, of which Mr.
                                         Burton is chairman
</TABLE>

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