MATRIX PARTNERS IV L P ET AL
SC 13G, 2000-02-14
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934

                                (Amendment No. )*


                                 Phone.com, Inc.
                                (Name of Issuer)

                     Common Stock, $.001 par value per share
                         (Title of Class of Securities)

                                   71920Q 10 0
                                 (CUSIP Number)

                               December 31, 1999

             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [ ]     Rule 13d-1(b)

         [ ]     Rule 13d-1(c)

         [X]     Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.
<PAGE>   2
CUSIP No. 71920Q 10 0
________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY).

     Matrix Partners IV, L.P. (04-3260303)

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           -4,821,658-
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          -0-
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         -4,821,658-
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH:           -0-
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     -4,821,658-

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
     (See Instructions)                                                    [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     7.06%

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON (See Instructions)

     PN

________________________________________________________________________________


                               Page 2 of 8 pages
<PAGE>   3
CUSIP No. 71920Q 10 0
________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY).

     Matrix IV Entrepreneurs Fund, L.P. (04-3293062)

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           -258,318-
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          -0-
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         -258,318-
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH:           -0-
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     -258,318-

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
     (See Instructions)                                                    [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     0.38%

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON (See Instructions)

     PN

________________________________________________________________________________


                               Page 3 of 8 pages
<PAGE>   4
CUSIP No. 71920Q 10 0
________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY).

     Matrix IV Management Co., L.P. (04-3260294)

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           -5,079,976-
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          -0-
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         -5,079,976-
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH:           -0-
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     -5,079,976-

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
     (See Instructions)                                                    [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     7.44%

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON (See Instructions)

     PN

________________________________________________________________________________


                               Page 4 of 8 pages
<PAGE>   5
CUSIP No. 71920Q 10 0
________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

     Andrew W. Verhalen (###-##-####)

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
                                                                 (a)  [_]
                                                                 (b)  [_]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     United States

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           5,093,590
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          -0-
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         -5,093,590-
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH:           -0-
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     -5,093,590-

________________________________________________________________________________
10.  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE
     INSTRUCTIONS)

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     7.46%

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)

     IN

________________________________________________________________________________


                               Page 5 of 8 pages
<PAGE>   6
CUSIP No. 71920Q 10 0

Item 1(a)                  Name of Issuer:

                           Phone.com, Inc.


Item 1(b)                  Address of Issuer's Principal Executive Offices:

                           800 Chesapeake Street
                           Redwood City, CA 94063

Item 2(a)                  Name of Person Filing:

                           Matrix Partners IV, L.P. ("Matrix IV"); Matrix IV
                           Entrepreneurs Fund, L.P. ("Entrepreneurs", and
                           together with Matrix IV, the "Partnerships"); Matrix
                           IV Management Co., L.P. ("Management"), the general
                           partner of each of the Partnerships; and Andrew W.
                           Verhalen ("Verhalen") the general partner of
                           Management who has sole voting and dispositive
                           authority with respect to shares of Phone.com, Inc.
                           held of record by the Partnerships.


Item 2(b)                  Address of Principal Business Office or, if none,
                           Residence:

                           The address of the reporting persons is:

                           1000 Winter Street, Suite 4500
                           Waltham, MA  02451


Item 2(c)                  Citizenship:

                           Matrix IV is a limited partnership organized under
                           the laws of the State of Delaware. Entrepreneurs is a
                           limited partnership organized under the laws of the
                           State of Delaware. Management is a limited
                           partnership organized under the laws of the State of
                           Delaware. Mr. Verhalen is a citizen of the United
                           States.


Item 2(d)                  Title of Class of Securities:

                           Common Stock, par value $.001 per share (the "Common
                           Stock").


Item 2(e)                  CUSIP Number:

                           71920Q 10 0


Item 3                     Description of Person Filing:

                           Not applicable.


Item 4                     Ownership(1):

                           (a)      Amount Beneficially Owned:

                                    Matrix IV is the record holder of 4,821,658
                                    shares of Common Stock and may be deemed to
                                    beneficially own the 4,821,658 shares of
                                    Common Stock held of record by it.
                                    Entrepreneurs is the record holder of
                                    258,318 shares of Common Stock and may be
                                    deemed to beneficially own the 258,318
                                    shares of Common Stock held of record by it.
                                    Management, as general partner of the
                                    Partnerships,

- ------------------------
1        As of December 31, 1999.


                               Page 6 of 8 pages
<PAGE>   7
CUSIP No. 71920Q 10 0

                                    may be deemed to beneficially own the
                                    5,079,976 shares of Common Stock held of
                                    record by the Partnerships. Mr. Verhalen, as
                                    the general partner who has sole voting and
                                    dispositive authority with respect to shares
                                    of Phone.com, Inc. held of record by the
                                    Partnerships, may be deemed to beneficially
                                    own the 5,079,976 shares of Common Stock
                                    held of record by the Partnerships and
                                    13,614 shares held in his name. The filing
                                    of this statement shall not be construed as
                                    an admission that any of the reporting
                                    persons are, for the purpose of Section
                                    13(d) or 13(g) of the Act, the beneficial
                                    owners of any securities covered under this
                                    statement.

                           (b)      Percent of Class:

                                    Matrix IV:                        7.06%
                                    Entrepreneurs:                    0.38%
                                    Management:                       7.44%
                                    Verhalen:                         7.46%

                           (c)      Number of Shares as to which the person has:

                                    (i) sole voting power; (ii) shared voting
                                    power; (iii) sole dispositive power; (iv)
                                    shared dispositive power:

                                    Matrix IV may be deemed to have sole power
                                    to vote and dispose of 4,821,658 shares of
                                    Common Stock held of record by it.
                                    Entrepreneurs may be deemed to have sole
                                    power to vote and dispose of 258,318 shares
                                    of Common Stock held of record by it.
                                    Management, as general partner of the
                                    Partnerships, may be deemed to have sole
                                    power to vote and dispose of 5,079,976
                                    shares of Common Stock held of record by the
                                    Partnerships. Mr. Verhalen, as general
                                    partner who has sole voting and dispositive
                                    authority with respect to shares of
                                    Phone.com, Inc. held of record by the
                                    Partnerships, may be deemed to have sole
                                    power 5,079,590 shares of Common Stock held
                                    of record by the Partnerships and 13,614
                                    shares held in his name.


Item 5                     Ownership of Five Percent or Less of a Class:

                           Not applicable.


Item 6                     Ownership of More than Five Percent on Behalf of
                           Another Person:

                           Not applicable.


Item 7                     Identification and Classification of the Subsidiary
                           Which Acquired the Security Being Reported on By the
                           Parent Holding Company:

                           Not applicable.


Item 8                     Identification and Classification of Members of the
                           Group:

                           Not applicable.


Item 9                     Notice of Dissolution of Group:

                           Not applicable.


Item 10                    Certification:


                               Page 7 of 8 pages
<PAGE>   8
CUSIP No. 71920Q 10 0

                                    SIGNATURE

         After reasonable inquiry and to the best of the knowledge and belief of
each of the undersigned, each of the undersigned hereby certifies that the
information set forth in this statement is true, complete and correct.

DATED:  February 10, 2000


                                          MATRIX PARTNERS IV, L.P.



                                          By:  Matrix IV Management Co., L.P.
                                               General Partner



                                               By:    /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen
                                                   General Partner



                                          MATRIX IV ENTREPRENEURS FUND, L.P.


                                          By:  Matrix IV Management Co., L.P.
                                               General Partner



                                               By:    /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen
                                                   General Partner



                                          MATRIX IV MANAGEMENT CO., L.P.



                                               By:    /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen
                                                   General Partner




                                                   /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen


                               Page 8 of 8 pages

<PAGE>   1
CUSIP No. 71920Q 10 0


                                                                       Exhibit I
                                    AGREEMENT

         Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934,
as amended, the undersigned hereby agree that only one statement containing the
information required by Schedule 13G need be filed with respect to the ownership
by each of the undersigned of the shares of Common Stock of Phone.com, Inc.

         EXECUTED as a sealed instrument this 10th day of February, 2000.

                                          MATRIX PARTNERS V, L.P.

                                          By:  Matrix IV Management Co., L.P.
                                               General Partner



                                          MATRIX IV ENTREPRENEURS FUND, L.P.

                                          By:  Matrix IV Management Co., L.P.
                                               General Partner



                                               By:    /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen
                                                   General Partner



                                          MATRIX IV MANAGEMENT CO., L.P.



                                               By:    /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen
                                                   General Partner




                                                   /s/ Andrew W. Verhalen
                                                   -------------------------
                                                   Andrew W. Verhalen




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