ALLEN & CO INC/ALLEN HOLDING INC
SC 13D, 1999-07-16
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<PAGE>

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                          ___________________________

                                 SCHEDULE 13D
                          ___________________________

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                             Omnipoint Corporation
                             ---------------------
                               (Name of Issuer)


                    Common Stock, Par Value $.01 Per Share
                    --------------------------------------
                        (Title of Class of Securities)


                                   68212D102
                                   ---------
                                (CUSIP number)


                         Allen & Company Incorporated
                               711 Fifth Avenue
                              New York, NY 10022
                                (212) 832-8000
                                --------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                                 June 23, 1998
                                --------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
 the acquisition which is the subject of this Schedule 13D, and is filing this
  Schedule because of Rule 13d-1(e), Rule 13d-1(f) or 13d-1(g), check the
                              following box: [ ]

                                      -1-
<PAGE>
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                      PAGE 2 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Allen & Company Incorporated
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      Delaware
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF
                          2,535,082 (Includes warrants to purchase 1,300,603
                                     shares of Common Stock)
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             2,535,082 (Includes warrants to purchase 1,300,603
                                     shares of Common Stock)
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      2,535,082 (Includes warrants to purchase 1,300,603 shares of Common Stock)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      4.6%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      BD,CO
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                      PAGE 3 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Avance Capital
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      N/A
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF
                          4,778,266
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             4,778,266

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      4,778,266

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      9%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      OO
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                      PAGE 4 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Madison Dearborn Capital Partners, L.P.
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      Illinois
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            6,190,156 (Includes warrants to purchase 229,167
                                    shares of Common Stock)
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             6,190,156 (Includes warrants to purchase 229,167
                                     shares of Common Stock)
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      6,190,156 (Includes warrants to purchase 229,167 shares of Common
                Stock)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      11.6%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      PN,IV
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>

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

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                     PAGE 5 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Douglas G. Smith
      Grantor Remainder Annuity Trust
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      [_]
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      N/A
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            659,759

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             659,759

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      659,759

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      1.2%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      OO
- ------------------------------------------------------------------------------
<PAGE>

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

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                     PAGE 6 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Richard L. Fields
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      [_]
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      U.S.A
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            441,118 (Includes options to purchase 123,750 shares
                                  of Common Stock)
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             441,118 (Includes options to purchase 123,750 shares
                                  of Common Stock)
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      441,118 (Includes options to purchase 123,750 shares
              of Common Stock)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      Less than 1%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
<PAGE>

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

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                      PAGE 7 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Evelyn R. Goldfine
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      [_]
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      U.S.A
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            387,909 (Includes options to purchase 304,075 shares
                                  of Common Stock)
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          1,250
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             387,909 (Includes options to purchase 304,075 shares
                                  of Common Stock)
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          1,250
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      387,909 (Includes options to purchase 304,075 shares of Common Stock)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      Less than 1%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
<PAGE>

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

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                      PAGE 8 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      George F. Schmitt
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      [_]
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      U.S.A.
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            1,488,330 (Includes options to purchase 1,285,837
                                    shares of Common Stock)
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             1,488,330 (Includes options to purchase 1,285,837
                                    shares of Common Stock)
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      1,488,330 (Includes options to purchase 1,285,837 shares of Common Stock)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      2.7%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
<PAGE>

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

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                     PAGE 9 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      James J. Ross
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      [_]
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      U.S.A.
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            1,422,820 (Includes options to purchase 840,375 shares
                                    of Common Stock)
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             1,422,820 (Includes options to purchase 840,375 shares
                                    of Common Stock)

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      1,422,820 (Includes options to purchase 840,375 shares of
                Common Stock)
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      2.6%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
<PAGE>

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

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 68212D102                                     PAGE 10 OF 18 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      James J. Ross Trust
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      [_]
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      N/A
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      N/A
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            291,000

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             291,000

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      291,000
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      Less than 1%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      OO
- ------------------------------------------------------------------------------
<PAGE>

Item 1. Security and Issuer.
        --------------------

        This statement on Schedule 13D relates to the Common Stock, $.01 par
        value per share (the "Common Stock"), of Omnipoint Corporation, a
        Delaware corporation (the "Issuer").  The Issuer's executive offices are
        located at 3 Metro Center, Bethesda, Maryland 20814.

Item 2. Identity and Background.
        ------------------------

        The name, present position and address of each director and executive
        officer of Allen & Company Incorporation ("Allen & Co.") and of each
        director and executive officer of the general partner of Madison
        Dearborn Capital Partners, L.P. ("MDCP"), are set forth in Schedule I
        and Schedule II hereto, respectively and are incorporated herein by
        reference.  Information on the other Filing Persons is set forth in
        Schedule III and are incorporated herein by reference.

        During the last five years, none of the Filing Persons, nor any of their
        respective executive officers, directors or general partners, (i) has
        been convicted in a criminal proceeding (excluding traffic violations or
        similar misdemeanors), or (ii) has been a party to a civil proceeding of
        a judicial or administrative body of competent jurisdiction and as a
        result of such proceeding was or is subject to a judgment, decree or
        final order enjoining future violations of, or prohibiting or mandating
        activities subject to, Federal or State securities laws or finding any
        violation with respect to such laws.

Item 3. Source and Amount of Funds or Other Consideration.
        --------------------------------------------------

        Not applicable.

Item 4. Purpose of Transaction.
        -----------------------

        Allen & Co., Avance Capital, MDCP , Douglas G. Smith Grantor Annuity
        Remainder Trust, Richard L. Fields, Evelyn R. Goldfine, George F.
        Schmitt, James J. Ross and James J. Ross Trust (collectively, the
        "Filing Persons") entered into an agreement with VoiceStream Wireless
        Corporation, a Washington corporation ("VoiceStream"), the Issuer and
        certain stockholders of VoiceStream named therein, dated as of June 23,
        1999 (the "Voting Agreement"). Pursuant to the Voting Agreement, each
        Filing Person has agreed to vote his/her shares of Omnipoint Common
        Stock in favor of (i) the adoption and approval of the Agreement and
        Plan of Reorganization by and between VoiceStream, VoiceStream Wireless
        Holding Corporation, a Delaware corporation and the Issuer, dated June
        23, 1999 (the "Reorganization Agreement"), and (ii) the proposed merger
        contemplated by the Reorganization Agreement and any other matters
        necessary to consummate the transactions contemplated in the
        Reorganization Agreement.

        The foregoing description of the Voting Agreement is subject to, and
        qualified in its entirety by reference to, the Voting Agreement, a copy
        of which is filed as exhibit hereto and incorporated by reference into
        this Item 4.

Item 5. Interest in Securities of the Issuer.
        --------------------------------------

                                      -11-
<PAGE>

        (a)  Upon exercise of outstanding options and warrants, the Filing
        Persons will have the right to vote for up to an aggregate of 16,963,622
        shares of Issuer's Common Stock, representing 30.18% of the issued and
        outstanding Common Stock.

        (b) Upon exercise of outstanding options and warrants, each Filing
        Person shares the power to vote or direct the vote of an aggregate of
        16,963,622 shares of Common Stock of the Issuer.

        (c)  No transactions in the Issuer's Common Stock were effected by
        Filing Persons or, to the knowledge of any of the Filing Persons, any of
        the Persons listed on Schedules I, II and III hereto, during the past 60
        days from the date hereof.

        (d)  Not applicable.

        (e)  Not applicable.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
        ------------------------------------------------------------------------
        Securities of the Issuer.
        -------------------------

        See Item 4 above.

Item 7. Material to be Filed as Exhibits.
        ---------------------------------

        99.1  The Voting Agreement.

                                      -12-
<PAGE>

                                  Signatures

After reasonable inquiry and to the best knowledge and belief of the
undersigned, the undersigned hereby certify that the information set forth in
this Schedule 13D is true, complete and correct.


Dated:  July 16, 1999



                            ALLEN & COMPANY INCORPORATED



                            By:  /s/ Richard L. Fields
                               --------------------------------
                            Name:  Richard L. Fields
                            Title: Executive Vice President and
                                   Managing Director


                            AVANCE CAPITAL



                            By:  /s/ Douglas G. Smith
                               --------------------------------
                            Name:  Douglas G. Smith
                            Title: Sole Proprietor


                            MADISON DEARBORN CAPITAL
                             PARTNERS, L.P.
                            By:  Madison Dearborn Partners, L.P., its General
                                 Partner
                            By:  Madison Dearborn Partners, Inc., its General
                                 Partner



                            By:  /s/ James N. Perry, Jr.
                               --------------------------------
                            Name:  James N. Perry, Jr.
                            Title: Managing Director

                                      -13-
<PAGE>

                            DOUGLAS G. SMITH Grantor Remainder Annuity Trust



                            By:  /s/ Gabriela Smith
                               ---------------------------------------------
                            Name:  Gabriela Smith
                            Title:  Trustee



                            By:  /s/ Richard L. Fields
                               ---------------------------------------------
                             Richard L. Fields, in his individual capacity



                            By:  /s/ Evelyn R. Goldfine
                               ---------------------------------------------
                             Evelyn R. Goldfine, in her individual capacity



                            By:  /s/ George F. Schmitt
                               ---------------------------------------------
                             George F. Schmitt, in his individual capacity



                            By:  /s/ James J. Ross
                               ---------------------------------------------
                             James J. Ross, in his individual capacity



                            By:  /s/ James J. Ross
                               ---------------------------------------------
                             Name:  James J. Ross
                             Title:  Trustee

                                      -14-
<PAGE>

                                   Schedule I
                                   ----------

    The name and position of each director and officer of Allen & Company
Incorporated is set forth below.  The business address of each person listed
below is 711 Fifth Avenue, New York, New York 10022-3194.

<TABLE>
<CAPTION>
          --------------------------------------------------------------------------------------------------
                                                              Principal Occupation (i.e., Position With
          Name                                                       Allen & Company Incorporated
          --------------------------------------------------------------------------------------------------
          <S>                                             <C>
          Herbert A. Allen                                President, Managing Director, Director, Chief
                                                          Executive Officer
          --------------------------------------------------------------------------------------------------
          Herbert A. Allen III                            Vice President, Director
          --------------------------------------------------------------------------------------------------
          Grace Allen                                     Director
          --------------------------------------------------------------------------------------------------
          Glenn A. Andreas III                            Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Eran S. Ashany                                  Vice President, Director
          --------------------------------------------------------------------------------------------------
          Edmund M. Bleich                                Vice President
          --------------------------------------------------------------------------------------------------
          Jay B. Bockhaus                                 Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Denise Calvo-Silver                             Vice President, Director
          --------------------------------------------------------------------------------------------------
          Dominick J. Cantalupo                           Co-Chief Operations Officer, Vice President
          --------------------------------------------------------------------------------------------------
          Marvyn Carton                                   Director - Emeritus
          --------------------------------------------------------------------------------------------------
          Gaetano J. Casillo                              Chief Compliance Officer, Vice President
          --------------------------------------------------------------------------------------------------
          Toby R. Coppel                                  Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Robert H. Cosgriff                              Chief Administrative Officer, Executive Vice
                                                          President, Managing Director, Director
          --------------------------------------------------------------------------------------------------
          Richard M. Crooks, Jr.                          Director
          --------------------------------------------------------------------------------------------------
          Thalia V. Crooks                                Vice President, Director
          --------------------------------------------------------------------------------------------------
          Mary L. Cullen                                  Vice President, Secretary, Director
          --------------------------------------------------------------------------------------------------
          Robert A. Dean                                  Vice President, Director
          --------------------------------------------------------------------------------------------------
          Orin F. Devereaux                               Vice President, Director
          --------------------------------------------------------------------------------------------------
          Daniel Englander                                Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Howard M. Felson                                Assistant Secretary, Vice President, Controller
          --------------------------------------------------------------------------------------------------
          Anthony J. Ferrante                             Treasurer
          --------------------------------------------------------------------------------------------------
          Richard L. Fields                               Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Paul A. Gould                                   Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          John G. Hall                                    Vice President, Director
          --------------------------------------------------------------------------------------------------
          George N. Jeppson                               Vice President - Elect
          --------------------------------------------------------------------------------------------------
          John H. Josephson                               Vice President, Director
          --------------------------------------------------------------------------------------------------
          Clarke R. Keough                                Vice President, Director
          --------------------------------------------------------------------------------------------------
          Donald R. Keough                                Chairman of the Board, Director
          --------------------------------------------------------------------------------------------------
          Kaveh A. Khosrowshahi                           Vice President, Director
          --------------------------------------------------------------------------------------------------
          LeRoy Kim                                       Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Neal Koop                                       Vice President
          --------------------------------------------------------------------------------------------------
          Nathaniel C.A. Kramer                           Vice President
          --------------------------------------------------------------------------------------------------
          Terry Allen Kramer                              Director
          --------------------------------------------------------------------------------------------------
          Irwin H. Kramer                                 Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
</TABLE>

                                      -15-
<PAGE>

<TABLE>
          <S>                                             <C>
          --------------------------------------------------------------------------------------------------
          Suzanne G. Kucera                               Vice President, Director
          --------------------------------------------------------------------------------------------------
          Robert J. Kurz                                  Vice President
          --------------------------------------------------------------------------------------------------
          Andreas L. Lazar                                Vice President - Elect
          --------------------------------------------------------------------------------------------------
          William F. Leimkuhler                           Assistant Secretary, Vice President, General
                                                          Counsel
          --------------------------------------------------------------------------------------------------
          Jonathan A. Lipton                              Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Dan W. Lufkin                                   Special Advisor to the Board of Directors
          --------------------------------------------------------------------------------------------------
          Robert A. Mackie                                Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Robert Maiden, Jr.                              Vice President
          --------------------------------------------------------------------------------------------------
          Terence C. McCarthy                             Co-Chief Operations Officer, Vice President
          --------------------------------------------------------------------------------------------------
          Robert C. Miller                                Vice President, Director
          --------------------------------------------------------------------------------------------------
          Kenneth L. Miltonberger                         Chief Technology Officer
          --------------------------------------------------------------------------------------------------
          Terrence C. Morris                              Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Brian J. Murphy                                 Vice President, Director
          --------------------------------------------------------------------------------------------------
          Louis J. Mustacchio                             Vice President
          --------------------------------------------------------------------------------------------------
          Walter T. O'Hara, Jr.                           Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Christine R. Olenchalk                          Vice President
          --------------------------------------------------------------------------------------------------
          Nancy B. Peretsman                              Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Patrick S. Perry                                Vice President, Director
          --------------------------------------------------------------------------------------------------
          Eugene Protash                                  Vice President, Assistant Secretary
          --------------------------------------------------------------------------------------------------
          James W. Quinn                                  Director, Vice President
          --------------------------------------------------------------------------------------------------
          James S. Rubin                                  Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Daniel J. Sapadin                               Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Philip D. Scaturro                              Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          John A. Schneider                               Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Daniel J. Selmonosky                            Vice President, Director
          --------------------------------------------------------------------------------------------------
          Enrique F. Senior                               Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Joseph E. Sheehan                               Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Stanley S. Shuman                               Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          John M. Simon                                   Executive Vice President, Managing Director,
                                                          Director
          --------------------------------------------------------------------------------------------------
          Kenneth M. Siskind                              Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Ian G. Smith                                    Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Everett K. Wallace                              Vice President - Elect
          --------------------------------------------------------------------------------------------------
          Dennis J. Warfield                              Vice President, Chief Information Officer
          --------------------------------------------------------------------------------------------------
          Kim M. Wieland                                  Executive Vice President, Managing Director,
                                                          Director, Chief Financial Officer
          --------------------------------------------------------------------------------------------------
          Edward D. Weinberger                            Director
          --------------------------------------------------------------------------------------------------
</TABLE>

                                      -16-
<PAGE>

                                  Schedule II
                                  -----------

    Madison Dearborn Partners, L.P. is the general partner of Madison Deaborn
Capital Partners, L.P.  Madison Dearborn Partners, Inc. is the general partner
of Madison Dearborn Partners, L.P.  The name and position of each director and
executive officer of Madison Dearborn Partners, Inc. are set forth below.  The
business address of each person listed below is Three First National Plaza,
Suite 3800, Chicago, Illinois 60602.

<TABLE>
<CAPTION>
          --------------------------------------------------------------------------------------------
          Name                                                Present Principal Position
          --------------------------------------------------------------------------------------------
          <S>                                                 <C>
          John A. Canning, Jr.                                President, Chief Executive Officer and
                                                              director
          --------------------------------------------------------------------------------------------
          Gary J. Little                                      Managing Director, Vice President and
                                                              Chief Financial Officer
          --------------------------------------------------------------------------------------------
          David F. Mosher                                     Managing Director and Secretary
          --------------------------------------------------------------------------------------------
          Nicholas W. Alexos                                  Managing Director
          --------------------------------------------------------------------------------------------
          Benjamin D. Chereskin                               Managing Director
          --------------------------------------------------------------------------------------------
          Paul J. Finnegan                                    Managing Director
          --------------------------------------------------------------------------------------------
          William J. Hunckler, III                            Managing Director
          --------------------------------------------------------------------------------------------
          Justin S. Huscher                                   Managing Director
          --------------------------------------------------------------------------------------------
          Samuel M. Mencoff                                   Managing Director
          --------------------------------------------------------------------------------------------
          James N. Perry, Jr.                                 Managing Director
          --------------------------------------------------------------------------------------------
          Thomas R. Reusche                                   Managing Director
          --------------------------------------------------------------------------------------------
          Timothy P. Sullivan                                 Managing Director
          --------------------------------------------------------------------------------------------
          Paul R. Wood                                        Managing Director
          --------------------------------------------------------------------------------------------
</TABLE>

                                      -17-
<PAGE>

                                 Schedule III
                                 ------------

    The name and present principal occupation of Filing Persons other than the
ones set forth in Schedules I and II are set forth below.  Except for Mr. James
J. Ross and his trust, whose business address is at 317 Madison Avenue, Suite
1410, New York, New York 10017, the business address of each of the Filing
Person named below has his/her business address at 3 Bethesda Metro Center,
Bethesda, Maryland 20814.

<TABLE>
<CAPTION>
          --------------------------------------------------------------------------------------------------
          Name                                      Present Principal Occupation
          --------------------------------------------------------------------------------------------------
          <S>                                       <C>
          Richard L. Fields                         Executive Vice President and Managing Director of Allen
                                                    & Company Incorporated
          --------------------------------------------------------------------------------------------------
          Evelyn R. Goldfine                        Chief Administrator Officer of Omnipoint Corporation
          --------------------------------------------------------------------------------------------------
          George F. Schmitt                         Executive Vice President of Omnipoint Corporation
          --------------------------------------------------------------------------------------------------
          James J. Ross                             Venture capitalist and Of Counsel to Becker Ross Stone
                                                    DeStafano & Klein
          --------------------------------------------------------------------------------------------------
          Avance Capital                            --
          --------------------------------------------------------------------------------------------------
          Douglas G. Smith GRAT                     --
          --------------------------------------------------------------------------------------------------
          James J. Ross Trust                       --
          --------------------------------------------------------------------------------------------------
</TABLE>

                                      -18-

<PAGE>

                                                                    Exhibit 99.1

                                   AGREEMENT
                                   ---------

          AGREEMENT, dated as of June 23, 1999, by and among OMNIPOINT
CORPORATION, a Delaware corporation ("Omnipoint"), VOICESTREAM WIRELESS
                                      ---------
CORPORATION, a Washington corporation ("VoiceStream"), the individuals and
                                        -----------
entities set forth on Schedule I hereto (each, an "Omnipoint Stockholder" and,
                                                   ---------------------
collectively, the "Omnipoint Stockholders") and the individuals and entities set
                   ----------------------
forth on Schedule II hereto (each, a "VoiceStream Stockholder" and,
                                      -----------------------
collectively, the "VoiceStream Stockholders").
                   ------------------------

          WHEREAS, concurrently herewith, each of Omnipoint and VoiceStream are
entering into an Agreement and Plan of Reorganization (the "Reorganization
                                                            --------------
Agreement") pursuant to which, among other things, wholly owned subsidiaries of
- ---------
VoiceStream Wireless Holding Corporation, a Delaware corporation ("Newco"), will
                                                                   -----
be merged with and into each of Omnipoint and VoiceStream (such mergers,
together with the related transactions contemplated in the Reorganization
Agreement, being referred to herein collectively as the "Merger");
                                                         ------

          WHEREAS, each Omnipoint Stockholder is the beneficial owner of the
number of shares of Omnipoint Common Stock set forth opposite such Omnipoint
Stockholder's name in Schedule I hereto (the "Omnipoint Shares");
                                              ----------------

          WHEREAS, each VoiceStream Stockholder is the beneficial owner of the
number of shares of VoiceStream Common Stock set forth opposite such VoiceStream
Stockholder's name in Schedule II hereto (the "VoiceStream Scheduled Shares");
                                               ----------------------------

          WHEREAS, approval of the Reorganization Agreement by each of
Omnipoint's and VoiceStream's stockholders is a condition to the consummation of
the Merger; and

          WHEREAS, as a condition to its entering into the Reorganization
Agreement, (i) VoiceStream has required that each Omnipoint Stockholder agree,
and each Omnipoint Stockholder has agreed, to enter into this Agreement, and
(ii) Omnipoint has required that each VoiceStream Stockholder agree, and each
VoiceStream Stockholder has agreed, to enter into this Agreement;

          NOW THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements set forth herein, the parties hereto agree as follows:

          Section 1.   Definitions.  Capitalized terms used herein and not
                       -----------
otherwise defined have the meaning ascribed to such term in the Reorganization
Agreement.
<PAGE>

          Section 2.   Agreement to Vote by Omnipoint Stockholders.
                       -------------------------------------------

          (1)  Each Omnipoint Stockholder hereby agrees to attend the Omnipoint
Stockholders' Meeting, in person or by proxy, and to vote (or cause to be voted)
all Omnipoint Shares, and any other voting securities of Omnipoint, beneficially
owned by such Omnipoint Stockholder (whether issued heretofore or hereafter)
that such Omnipoint Stockholder owns or has the right to vote, (i) in favor of
adoption and approval of the Reorganization Agreement and the Merger and any
other matters necessary to consummate the transactions contemplated in the
Reorganization Agreement and (ii) against any Alternative Proposal or Superior
Proposal; such agreement to vote shall apply also to any adjournment or
adjournments of the Omnipoint Stockholders' Meeting.

          (2)  From and after the date hereof through the earlier of the
Effective Time or the termination of the Reorganization Agreement, each
Omnipoint Stockholder (other than with respect to any distribution by Madison
Dearborn Capital Partners, L.P. of its Omnipoint Shares to its partners) hereby
agrees not to sell, transfer, pledge, encumber or otherwise dispose of
(collectively, "Transfer") in the aggregate and whether in a single transaction
or a series of unrelated transactions more than thirty (30%) percent of the
Omnipoint Shares beneficially owned by such Omnipoint Stockholder on the date
hereof, unless, as a condition to any such Transfer, each transferee (or, in the
case of a pledge or similar transfer, each pledgee or similar conditional
transferee) of any shares in excess of thirty (30%) percent of the Omnipoint
Shares beneficially owned by such Omnipoint Stockholder shall, prior to such
Transfer (or, in the case of a pledge or similar Transfer, prior to taking title
to or exercising any rights with respect to the applicable Omnipoint Shares),
agree in writing to be bound by all of the provisions of this Agreement
applicable to the Omnipoint Stockholders (and such transferee shall thereby
become an Omnipoint Stockholder for all purposes of this Agreement), except that
such Transferee shall not be entitled to Transfer any such shares unless all
transferees of all shares so transferred agree to be bound by the terms of
Section 2(a) hereof and such Transferee (and such Transferee's transferees)
shall not be entitled to the benefits of the exception applicable to the
Omnipoint Stockholders with respect to 30% of the Omnipoint Shares beneficially
owned by them.  Any Transfer of such shares and securities without compliance
with such provisions of this Agreement shall be null and void and such
transferee shall  have no rights as a stockholder of Omnipoint.

          (3)  To the extent inconsistent with the foregoing provisions of this
Section 2, each Omnipoint Stockholder hereby revokes any and all previous
proxies with respect to such Omnipoint Stockholder's Omnipoint Shares or any
other voting securities of Omnipoint.

          Section 3.   Agreement to Vote by VoiceStream Stockholders.
                       ---------------------------------------------

          (1)  Each VoiceStream Stockholder hereby agrees to attend the
VoiceStream Stockholders' Meeting, in person or by proxy, and to vote (or cause
to be voted) all VoiceStream

                                       2
<PAGE>

Scheduled Shares owned by such VoiceStream Stockholder at the time of the
VoiceStream Stockholders' Meeting in favor of adoption and approval of the
Reorganization Agreement, the Merger and the Hutchison Transaction and any other
matters necessary to consummate the transactions contemplated in the
Reorganization Agreement; such agreement to vote shall apply also to any
adjournment or adjournments of the VoiceStream Stockholders' Meeting.

          (2)  From and after the date hereof through the earlier of the
Effective Time or the termination of the Reorganization Agreement, each
VoiceStream Stockholder (other than with respect to any distribution by Hellman
& Friedman Capital Partners II, L.P., H&F Orchard Partners, L.P., H&F
International Partners, L.P., GS Capital Partners, L.P., Bridge Street Fund
1992, L.P., Stone Street Fund 1992, L.P. or Providence Media Partners L.P. of
their VoiceStream shares to their partners) hereby agrees not to Transfer in the
aggregate and whether in a single transaction or a series of unrelated
transactions more than (30%) percent of the VoiceStream Scheduled Shares,
unless, as a condition to any such Transfer, each transferee (or, in the case of
a pledge or similar transfer, each pledgee or similar conditional transferee) of
any shares in excess of thirty (30%) percent of the VoiceStream Scheduled
Shares, prior to such Transfer (or, in the case of a pledge or similar transfer,
prior to taking title to or exercising any rights with respect to the applicable
VoiceStream Scheduled Shares),  agree in writing to be bound by all of the
provisions of this Agreement applicable to the VoiceStream Stockholders (and
such transferee shall thereby become a VoiceStream Stockholder for all purposes
of this Agreement), except that such Transferee shall not be entitled to
Transfer any such shares unless all transferees of all shares so transferred
agree to be bound by the terms of Section 3(a) hereof and such Transferee (and
such Transferee's transferees) shall not be entitled to the benefits of the
exception applicable to the VoiceStream Stockholders with respect to 30% of the
VoiceStream Scheduled Shares.  Any Transfer of such shares and securities
without compliance with such provisions of this Agreement shall be null and void
and such transferee shall  have no rights as a stockholder of VoiceStream.

          (3)  To the extent inconsistent with the foregoing provisions of this
Section 3, each VoiceStream Stockholder hereby revokes any and all previous
proxies with respect to such VoiceStream Stockholder's VoiceStream Scheduled
Shares.

          Section 4.   Amendment of Existing VoiceStream Voting Agreement.
                       --------------------------------------------------

          The VoiceStream Stockholders are parties to a Voting Agreement, dated
May 3, 1999 ("VoiceStream Voting Agreement"), pursuant to which they have agreed
to vote their VoiceStream Scheduled Shares owned by each of them at the time of
such vote in favor of directors designated by such VoiceStream Stockholders.
Effective on the Effective Time the VoiceStream Stockholders shall terminate the
VoiceStream Voting Agreement and enter into a new Voting Agreement ("Newco
                                                                     -----
Voting Agreement") with the Omnipoint Stockholders on terms mutually
- ----------------
satisfactory to the VoiceStream Stockholders and the Omnipoint Stockholders,
pursuant to which the voting arrangements which existed under the VoiceStream
Voting Agreement will apply to Newco and the

                                       3
<PAGE>

provisions of Section 6.1 of the Securities Purchase Agreement, of even date
herewith, between VoiceStream and Omnipoint, will also be effectuated.

          Section 5.   Representations and Warranties of VoiceStream and
                       -------------------------------------------------
Omnipoint.
- ---------

          (1)  VoiceStream represents and warrants to Omnipoint and each
Omnipoint Stockholder as follows: (i) each of this Agreement and the
Reorganization Agreement has been approved by the Board of Directors of
VoiceStream and (ii) each of this Agreement and the Reorganization Agreement has
been duly executed and delivered by VoiceStream and constitutes its valid and
binding agreement, enforceable against it in accordance with its terms, except
as may be limited by applicable bankruptcy, insolvency, reorganization,
moratorium and other similar laws of general application which may affect the
enforcement of creditors' rights generally and by general equitable principles.

          (2)  Omnipoint represents and warrants to VoiceStream and each
VoiceStream Stockholder as follows: (i) each of this Agreement and the
Reorganization Agreement has been approved by the Board of Directors of
Omnipoint and (ii) each of this Agreement and the Reorganization Agreement has
been duly executed and delivered by Omnipoint and constitutes its valid and
binding agreement, enforceable against it in accordance with its terms, except
as may be limited by applicable bankruptcy, insolvency, reorganization,
moratorium and other similar laws of general application which may affect the
enforcement of creditors' rights generally and by general equitable principles.

          Section 6.   Representations and Warranties of the Omnipoint
                       -----------------------------------------------
Stockholders and VoiceStream Stockholders.
- -----------------------------------------

          (1)  Each Omnipoint Stockholder, severally, as to such Omnipoint
Stockholder, represents and warrants to VoiceStream as follows: (i) this
Agreement has been duly executed and delivered by such Omnipoint Stockholder and
constitutes its valid and binding agreement, enforceable against it in
accordance with its terms, except as may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium and other similar laws of general
application which may affect the enforcement of creditors' rights generally and
by general equitable principles; and (ii) the Omnipoint Shares listed next to
the name of such Omnipoint Stockholder on Schedule I hereto are the only voting
securities of Omnipoint owned (beneficially or of record) by it.

          (2)  Each VoiceStream Stockholder, severally, as to such VoiceStream
Stockholder, represents and warrants to Omnipoint that this Agreement has been
duly executed and delivered by such VoiceStream Stockholder and constitutes its
valid and binding agreement, enforceable against it in accordance with its
terms, except as may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium and other similar laws of general application which
may affect the enforcement of creditors' rights generally and by general
equitable principles.

                                       4
<PAGE>

          Section 7.   Effectiveness and Termination.  It is a condition
                       -----------------------------
precedent to the effectiveness of this Agreement that the Reorganization
Agreement shall have been executed and delivered and be in full force and
effect. In the event the Reorganization Agreement is terminated in accordance
with its terms, this Agreement shall automatically terminate and be of no
further force or effect. Upon such termination, except for any rights any party
may have in respect of any breach by any other party of its or his obligations
hereunder, none of the parties hereto shall have any further obligation or
liability hereunder.

          Section 8.   Miscellaneous.
                       -------------

          (1)  Notices, Etc.  All notices, requests and other communications to
               -------------
any party hereunder shall be in writing (including facsimile transmission) and
shall be given,

          if to VoiceStream, to it at:

               3650 131 Avenue SE
               Bellevue, Washington 98006
               Attention: Alan R. Bender, Esq.
               Fax: (425) 586-8080

          with a copy to:

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

          if to any VoiceStream Stockholder, to it at the address set forth on
          Schedule II hereto;

          if to Omnipoint, to it at:

               Omnipoint Corporation
               3 Bethesda Metro Center
               Suite 400
               Bethesda, Maryland 20814
               Attention: Douglas G. Smith
               Fax: 301-951-3591

                                       5
<PAGE>

          with a copy to:

               Piper & Marbury L.L.P.
               1200 Nineteenth Street, N.W.
               Washington, D.C.  20036
               Attention: Edwin M. Martin, Jr., Esq.
               Fax: (202) 233-2085

          if to any Omnipoint Stockholder, to it at the address set forth on
          Schedule I hereto;

or such other address or facsimile number as such party may hereafter specify
for the purpose by notice to the other parties hereto. All such notices,
requests and other communications shall be deemed received on the date of
receipt by the recipient thereof if received prior to 5 p.m. on a Business Day,
in the place of receipt. Otherwise, any such notice, request or communication
shall be deemed not to have been received until the next succeeding Business Day
in the place of receipt.

          (2)  Amendments; No Waivers.  (i)  Subject to applicable law, any
               ----------------------
provision of this Agreement may be amended or waived, but only if, such
amendment or waiver is in writing and is signed, in the case of an amendment, by
each party to this Agreement or, in the case of a waiver, by each party against
whom the waiver is to be effective.

               (ii)  No failure or delay by any party in exercising any right,
power or privilege hereunder shall operate as a waiver thereof nor shall any
single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies herein provided shall be cumulative and not exclusive of any rights or
remedies provided by law.

          (3)  Successors and Assigns.  This Agreement shall be binding upon and
               ----------------------
shall inure to the benefit of and be enforceable by the parties and their
respective successors and assigns, including, without limitation, in the case of
any corporate party hereto any corporate successor by merger or otherwise, and
in the case of any individual party hereto any trustee, executor, heir, legatee
or personal representative succeeding to the ownership of such party's shares of
Omnipoint Common Stock or other securities subject to this Agreement.
Notwithstanding any Transfer of shares of Omnipoint Common Stock the transferor
shall remain liable for the performance of all obligations under this Agreement
of transferor.

          (4)  Governing Law.  This Agreement shall be governed by and construed
               -------------
in accordance with the laws of the State of Delaware, without regard to the
conflicts of law rules of such State.

          (5)  Jurisdiction.  Any suit, action or proceeding seeking to enforce
               ------------
any provision of, or based on any matter arising out of or in connection with,
this Agreement or the transactions contemplated hereby shall be brought in any
federal court located in the State of Delaware or any

                                       6
<PAGE>

Delaware state court, and each of the parties hereby consents to the exclusive
jurisdiction of such courts (and of the appropriate appellate courts therefrom)
in any such suit, action or proceeding and irrevocably waives, to the fullest
extent permitted by law, any objection that it may now or hereafter have to the
laying of the venue of any such suit, action or proceeding in any such court or
that any such suit, action or proceeding brought in any such court has been
brought in an inconvenient forum. Process in any such suit, action or proceeding
may be served on any party anywhere in the world, whether within or without the
jurisdiction of any such court. Without limiting the foregoing, each party
agrees that service of process on such party as provided in Section 6(e) shall
be deemed effective service of process on such party.

          (6)  WAIVER OF JURY TRIAL.  EACH OF THE PARTIES HERETO HEREBY
               --------------------
IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING
ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED
HEREBY.

          (7)  Counterparts; Effectiveness.  This Agreement may be signed in any
               ---------------------------
number of counterparts, each of which shall be an original, with the same effect
as if the signatures thereto and hereto were upon the same instrument. This
Agreement shall become effective when each party hereto shall have received
counterparts hereof signed by all of the other parties hereto. No provision of
this Agreement is intended to confer any rights, benefits, remedies, obligations
or liabilities hereunder upon any Person other than the parties hereto and their
respective successors and assigns.

          (8)  Entire Agreement.  This Agreement, together with the
               ----------------
Reorganization Agreement, constitutes the entire agreement between the parties
with respect to the subject matter of this Agreement and supersedes all prior
agreements and understandings, both oral and written, between the parties with
respect to such subject matter.

          (9)  Captions.  The captions herein are included for convenience of
               --------
reference only and shall be ignored in the construction or interpretation
hereof.

          (10) Severability.  If any term, provision, covenant or restriction of
               ------------
this Agreement is held by a court of competent jurisdiction or other authority
to be invalid, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions of this Agreement shall remain in full force and
effect and shall in no way be affected, impaired or invalidated so long as the
economic or legal substance of the transactions contemplated hereby is not
affected in any manner materially adverse to any party. Upon such a
determination, the parties shall negotiate in good faith to modify this
Agreement so as to effect the original intent of the parties as closely as
possible in an acceptable manner so that the transactions contemplated hereby be
consummated as originally contemplated to the fullest extent possible.

          (11) Specific Performance.  The parties hereto agree that irreparable
               --------------------
damage would occur if any provision of this Agreement were not performed in
accordance with the terms

                                       7
<PAGE>

hereof and that the parties shall be entitled to an injunction or injunctions to
prevent breaches of this Agreement or to enforce specifically the performance of
the terms and provisions hereof in any federal court located in the State of
Delaware or any Delaware state court, in addition to any other remedy to which
they are entitled at law or in equity.

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

          (13) Limitation on Liability.  No party hereto shall have any
               -----------------------
liability hereunder for any actions or omissions of any other party hereto.

          (14) Expenses.  Each party hereto shall bear its own expenses incurred
               --------
in connection with this Agreement.

          (15) Further Assurances.  Each party hereto agrees that such party
               ------------------
shall execute and deliver such additional instruments and other documents and
shall take such further actions as may be necessary or appropriate to
effectuate, carry out and comply with all of their obligations under this
Agreement.  Without limiting the generality of the foregoing, none of the
parties hereto shall enter into any agreement or arrangement (or alter, amend or
terminate any existing agreement or arrangement) if such action would impair the
ability of any party to effectuate, carry out or comply with all the terms of
this Agreement.















                                       8
<PAGE>

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

                                 VOICESTREAM WIRELESS CORPORATION


                                 By: /s/ John W. Stanton
                                     --------------------------------------
                                     Name:  John W. Stanton
                                     Title:  Chairman


                                 OMNIPOINT CORPORATION


                                 By:  /s/ Douglas G. Smith
                                     ---------------------------------------
                                     Name:  Douglas G. Smith
                                     Title:   Chairman, President and CEO


                                 VoiceStream Stockholders:

                                 Hellman & Friedman Capital Partners II, L.P.,
                                 a California limited partnership


                                 By:  Hellman & Friedman Investors, L.P.,
                                      its general partner

                                      By:  Hellman & Friedman Investors, Inc.,
                                           its general partner


                                      By:  /s/ Mitchell R. Cohen
                                          ------------------------------------
                                          Name:  Mitchell R. Cohen
                                          Title:  Vice President
<PAGE>

                                 H&F Orchard Partners, L.P., a California
                                 limited partnership

                                 By:  H&F Orchard Investors, L.P., its general
                                      partner

                                      By:  H&F Orchard Investors, Inc., its
                                           general partner


                                      By:  /s/ Mitchell R. Cohen
                                          ------------------------------------
                                          Name:  Mitchell R. Cohen
                                          Title:  Vice President


                                 H&F International Partners, L.P., a California
                                 limited partnership

                                 By:  H&F International Investors, L.P., its
                                      general partner

                                      By:  H&F International Investors, Inc.,
                                           its general partner


                                      By:  /s/ Mitchell R. Cohen
                                          ------------------------------------
                                          Name:  Mitchell R. Cohen
                                          Title:  Vice President

                                 /s/ John W. Stanton
                                 ---------------------------------------------
                                 John W. Stanton

                                 /s/ Theresa E. Gillespie
                                 ---------------------------------------------
                                 Theresa E. Gillespie
<PAGE>

                                 PN Cellular, Inc.


                                 By: /s/ John W. Stanton
                                     -----------------------------------------
                                     Name: John W. Stanton
                                     Title:


                                 Stanton Family Trust


                                 By: /s/ Donald Guthrie
                                     -----------------------------------------
                                     Name: Donald Guthrie, Trustee


                                 Stanton Communications Corporation


                                 By: /s/ John W. Stanton
                                     -----------------------------------------
                                     Name: John W. Stanton
                                     Title:


                                 GS Capital Partners, L.P.

                                 By:  GS Advisors L.P., General Partner

                                      By:  GS Advisors, Inc., General Partner


                                      By: /s/ Eve M. Gerriets
                                          ------------------------------------
                                          Name: Eve M. Gerriets
                                          Title:Vice President


                                 The Goldman Sachs Group, Inc.


                                 By: /s/ Terence M. O'Toole
                                     -----------------------------------------
                                     Name: Terence M. O'Toole
                                     Title:Attorney-in-fact
<PAGE>

                                 Bridge Street Fund 1992, L.P.


                                 By:  Stone Street Performance Corp., Managing
                                      General Partner


                                      By: /s/ Eve M. Gerriets
                                          ------------------------------------
                                          Name: Eve M. Gerriet
                                          Title: Vice President


                                 Stone Street Fund 1992, L.P.


                                 By:  Stone Street Performance Corp., General
                                      Partner


                                      By:/s/ Eve M. Gerriets
                                          ------------------------------------
                                          Name: Eve M. Gerriets
                                          Title:Vice President


                                 Providence Media Partners L.P.


                                 By:  Providence Media G.P. Limited
                                      Partnership, General Partner


                                      By:  Providence Ventures L.P., General
                                           Partner


                                      By: /s/ Jonathan Nelson
                                          ------------------------------------
                                          Name: Jonathan Nelson
                                          Title:
<PAGE>

                            Hutchison Telecommunications Holdings (USA) Limited


                            By: /s/ Susan Chow
                                -----------------------------------------
                                Name: Susan Chow
                                Title:Director


                            Hutchison Telecommunications PCS (USA) Limited


                            By: /s/ Frank Sixt
                                -----------------------------------------
                                Name: Frank Sixt
                                Title:Director



                            Omnipoint Stockholders:

                            ALLEN & COMPANY INCORPORATED



                            By:  /s/ Richard L. Fields
                               --------------------------------
                            Name:  Richard L. Fields
                            Title: Executive Vice President and
                                   Managing Director


                            AVANCE CAPITAL



                            By:  /s/ Douglas G. Smith
                               --------------------------------
                            Name:  Douglas G. Smith
                            Title: Sole Proprietor


                            MADISON DEARBORN CAPITAL
                             PARTNERS, L.P.
                            By:  Madison Dearborn Partners, L.P., its General
                                 Partner
                            By:  Madison Dearborn Partners, Inc., its General
                                 Partner



                            By:  /s/ James N. Perry, Jr.
                               --------------------------------
                            Name:  James N. Perry, Jr.
                            Title: Managing Director


                            DOUGLAS G. SMITH Grantor Remainder Annuity Trust



                            By:  /s/ Gabriela Smith
                               ---------------------------------------------
                            Name:  Gabriela Smith
                            Title:  Trustee



                            By:  /s/ Richard L. Fields
                               ---------------------------------------------
                             Richard L. Fields, in his individual capacity



                            By:  /s/ Evelyn R. Goldfine
                               ---------------------------------------------
                             Evelyn R. Goldfine, in her individual capacity



                            By:  /s/ George F. Schmitt
                               ---------------------------------------------
                             George F. Schmitt, in his individual capacity



                            By:  /s/ James J. Ross
                               ---------------------------------------------
                             James J. Ross, in his individual capacity



                            By:  /s/ James J. Ross
                               ---------------------------------------------
                             Name:  James J. Ross
                             Title:  Trustee




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