ARCH COMMUNICATIONS GROUP INC /DE/
SC 13D, 1998-07-10
RADIOTELEPHONE COMMUNICATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                               --------------

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                               (Amendment No. _)*

                         ARCH COMMUNICATIONS GROUP, INC.
                                (Name of Issuer)

                                  COMMON STOCK
                                 $.01 PAR VALUE
                         (Title of Class of Securities)

                                   039381-10-8
                                 (CUSIP Number)

                                Edward Grinacoff
                           Sandler Capital Management
                           767 Fifth Ave., 45th Floor
                               New York, NY 10153
                                  212-754-8100

                  Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                  June 29, 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 statement because of Rule 13d-1(b)(3) or (4), check the following box [ ].
                                 --------------

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder  of this cover page shall be filed 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 on 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).

                        (Continued on following pages)

<PAGE>

                                  SCHEDULE 13D
CUSIP No. 039381-10-8                                             Page 2 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             Sandler Capital Partners IV, L.P.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  2,754,545                   11.0%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   2,754,545                   11.0%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             2,754,545; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             11.0%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 3 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                         Sandler Capital Partners IV FTE, L.P.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  1,131,818                   4.5%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   1,131,818                   4.5%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             1,131,818; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             4.5%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 4 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             Harvey Sandler


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             PF

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             United States


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  113,636                    0.5%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH                                   4,739,000; See Item 3-5   18.9% 
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   113,636                    0.5%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                                             4,739,000; See Item 3-5   18.9%

- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             4,853,000; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             19.4%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             IN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 5 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             John Kornreich


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             PF

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             United States


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  46,205                      0.2%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH                                   4,784,364; See Items 3-5   19.1%
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   46,205                      0.2%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                                             4,784,364; See Items 3-5   19.1%

- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             4,830,569; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             19.3%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             IN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 6 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             Michael J. Marocco


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             PF

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             United States


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  36,364                      0.1%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH                                   4,739,364; See Items 3-5   18.9%
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   36,364                      0.1%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                                             4,739,364; See Items 3-5   18.9%

- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             4,775,728; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             19.1%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             IN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 7 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             Andrew Sandler


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             PF

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             United States


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  9,091                      0.04%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH                                   4,739,364; See Items 3-5  18.9%
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   9,091                      0.04%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                                             4,739,364; See Items 3-5  18.9%

- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             4,748,455; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             19.0%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             IN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 8 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             Sandler Capital Management


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             New York


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  348,000                      1.4%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH                                   4,246,364; See Items 3-5    17.0%
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   348,000                      1.4%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER
                                             4,246,364; See Items 3-5    17.0%

- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             4,594,364; See Items 3-5    

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             18.3%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 9 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                    21st Century Communications Partners, L.P.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  244,085                     1.0%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   244,085                     1.0%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             244,085; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             1.0%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 10 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                21st Century Communications T-E Partners, L.P.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  83,050                      0.3%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   83,050                      0.3%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             83,050; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             0.3%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 11 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                            21st Century Communications Foreign Partners, L.P.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  32,865                     0.1%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   32,865                     0.1%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             32,865; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             0.1%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN


- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 12 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             Sandler Associates


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             New York


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  145,000                     0.6%
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   145,000                     0.6%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             145,000; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             0.6%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN



- --------------------------------------------------------------------------------
                     *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. 039381-10-8                                             Page 13 of 35
- --------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                                             J.K. Media, L.P.


- --------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3   SEC USE ONLY




- --------------------------------------------------------------------------------
   4   SOURCE OF FUNDS*


                                             WC

- --------------------------------------------------------------------------------
   5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
       ITEMS 2(d) OR 2(e)                                         [  ]


- --------------------------------------------------------------------------------
   6   CITIZENSHIP OR PLACE OF ORGANIZATION

                                             Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      7    SOLE VOTING POWER
     SHARES                                  45,000                      0.2%  
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      8    SHARED VOTING POWER
      EACH
   REPORTING      --------------------------------------------------------------
     PERSON       9    SOLE DISPOSITIVE POWER
      WITH                                   45,000                      0.2%
                  --------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER


- --------------------------------------------------------------------------------
  11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                             45,000; See Items 3-5

- --------------------------------------------------------------------------------
  12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

                                                                      [  ]

- --------------------------------------------------------------------------------
  13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                                             0.2%; See Items 3-5

- --------------------------------------------------------------------------------
  14   TYPE OF REPORTING PERSON*
                                             PN


- --------------------------------------------------------------------------------
                     *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>



     This  statement,  relates to the reporting  persons'(i)  acquisition  of an
aggregate of 225,000 shares of Series C Convertible  Preferred  Stock, par value
$0.01 per share (the "Series C Preferred Stock"), of Arch Communications  Group,
Inc., a Delaware  corporation  (the  "Issuer" or the  "Company"),  pursuant to a
Stock  Purchase  Agreement,  dated  as of June 29,  1998  (the  "Stock  Purchase
Agreement"),  among,  interalia,  Issue,  Sandler  Capital  Partners IV, L.P., a
Delaware limited partnership,  Sandler Capital Partners IV FTE, L.P., a Delaware
limited  partnership,  Harvery Sandler,  John Kornreich,  Michael J. Marocco and
Andrew Sandler (collectively,  the "Series C Purchasers"), and (ii) ownership of
an aggregate of 898,000  shares of Issuer's  Common  Stock,  par value $0.01 per
share ("the "Common Stock"). As of June 29, 1998, the 225,000 shares of Issuer's
Series C Preferred  Stock were  convertible  into  4,090,909  shares of Issuer's
Common Stock.

         ITEM 1.           Security and Issuer.

                           (a)      Common Stock
                                    (CUSIP No. 039381-10-8).

                           (b)      Arch Communications Group, Inc.
                                    1800 W. Park Dr., Suite 250
                                    Westborough, MA 01581

         ITEM 2.     Identity and Background.

     The reporting persons include, among others, Sandler Capital Management,  a
New York  general  partnership  ("SCM"),  Sandler  Capital  Partners IV, L.P., a
Delaware limited  partnership ("SCP IV"), Sandler Capital Partners IV FTE, L.P.,
a Delaware limited  partnership ("SCP IV FTE," and with SCP IV, the "SCP Funds")
and Harvey Sandler, John Kornreich, Michael J. Marocco and Andrew Sandler (each,
an "Individual", and collectively,  the "Individuals").  SCM holds securities on
behalf  of  certain  managed  accounts  with  respect  to  which  SCM  exercises
investment and voting discretion.  Each of SCM, Sandler  Associates,  a New York
limited  partnership  ("Sandler  Associates"),  J. K.  Media,  L.P.,  a New York
limited partnership ("J.K. Media"), 21st Century Communications  Partners, L.P.,
a Delaware limited  partnership  ("21st CCP"), 21st Century  Communications  T-E
Partners,  L.P., a Delaware  limited  partnership  (21st  CCT-EP,"  21st Century
Communications  Foreign Partners,  L.P., a Delaware limited  partnership  ("21st
CCFP," and together with 21st CCP and 21st CCT-EP,  the "21st  Century  Funds"),
also owns shares of Common Stock.

     Each  Individual,  through  a  Delaware  or New  York  corporation  that is
controlled by such  Individual and that serves as a general  partner of SCM, may
be deemed to be a beneficial owner of the securities held by SCM and its managed
accounts.

                                       14

<PAGE>



     SCM is a general partner of Sandler Investment  Partners,  L.P., a Delaware
limited partnership ("SIP"), which is a general partner of each of the SCP Funds
and the 21st Century Funds.

     Each Individual is a general partner of Sandler Associates.

     John Kornreich is a general partner of J.K. Media.

        1.       (a)      Sandler Capital Partners IV, L.P., 
                          a Delaware limited partnership.
                 (b)      Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                 (c)      Principal Occupation:  Investments.
                 (d)      No.
                 (e)      No.

     Harvey  Sandler,  and John Kornreich  each control a Delaware  corporation,
Michael Marocco controls a New York corporation, and and Andrew Sandler controls
a Delaware limited liabilty company. Each of such entity is a general partner of
SCM. SCM is the general partner of SIP. SIP is a general partner of SCP IV.

        2.       (a)      Sandler Capital Partners IV FTE, L.P., 
                          a Delaware limited partnership.
                 (b)      Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                 (c)      Principal Occupation:  Investments.
                 (d)      No.
                 (e)      No.

     Harvey  Sandler,  and John Kornreich  each control a Delaware  corporation,
Michael Marocco controls a New York corporation, and and Andrew Sandler controls
a Delaware limited liabilty company. Each of such entity is a general partner of
SCM. SCM is the general partner of SIP. SIP is a general partner of SCP IV FTE.

        3.         (a)    Harvey  Sandler  is the sole  shareholder  of ARH
                          Corp., a Delaware corporation ("ARH").
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal Occupation:  General partner of partnerships
                          and  limited  partnerships  engaged in the  investment
                          business.
                   (d)    No.
                   (e)    No.
                   (f)    Citizenship:  United States.

                                       15

<PAGE>



     ARH Corp.  is a general  partner  of SCM.  Harvey  Sandler is the father of
Andrew Sandler.

          4.       (a)    John Kornreich is the majority shareholder of Four
                          JK Corp.,  a Delaware  corporation  ("Four JK"), and 
                          a general partner of J.K. Media.
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal  Business:  General  partner of partnerships
                          and  limited  partnerships  engaged in the  investment
                          business.
                   (d)    No.
                   (e)    No.
                   (f)    Citizenship:  United States.

        Four JK Corp. is a general partner of SCM.

          5.       (a)    Michael J. Marocco, is the sole shareholder of MJDM 
                          Corp., a New York corporation ("MJDM").
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal  Business:  General  partner of partnerships
                          and  limited  partnerships  engaged in the  investment
                          business.
                   (d)    No.
                   (e)    No.
                   (f)    Citizenship:  United States.

                   MJDM Corp. is a general partner of SCM.

           6.      (a)    Andrew  Sandler is the  majority member of ALSI, LLC,
                          a Delaware limited liability company ("ALSI").
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal Occupation:  General partner of partnerships
                          and  limited  partnerships  engaged in the  investment
                          business.
                   (d)    No.
                   (e)    No.
                   (f)    Citizenship:  United States.

                    ALSI is a general  partner of SCM. Andrew Sandler is the son
                    of Harvey Sandler.

        7.         (a)    Sandler Capital Management, a registered investment 
                          adviser and a general partnership organized under the 
                          laws of the State of New York.
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal Occupation:  Investments.
                   (d)    No.
                   (e)    No.

                                       16

<PAGE>


     Harvey  Sandler,  and John Kornreich  each control a Delaware  corporation,
Michael Marocco controls a New York corporation, and and Andrew Sandler controls
a Delaware limited liabilty company. Each of such entity is a general partner of
SCM. SCM is a general  partner of SIP, which is a general partner of each of the
SCP IV Funds and the 21st Century Funds.
   
        8.       (a)      21st Century Communications Partners, L.P., a Delaware
                          limited partnership.
                 (b)      Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                 (c)      Principal Occupation:  Investments.
                 (d)      No.
                 (e)      No.

     Harvey  Sandler,  and John Kornreich  each control a Delaware  corporation,
Michael Marocco controls a New York corporation, and and Andrew Sandler controls
a Delaware limited liabilty company. Each of such entity is a general partner of
SCM. SCM is the general partner of SIP. SIP is a general partner of 21st CCP.

        9.       (a)      21st Century Communications T-E Partners,  L.P., a
                          Delaware limited partnership.
                 (b)      Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                 (c)      Principal Occupation:  Investments.
                 (d)      No.
                 (e)      No.

     Harvey  Sandler,  and John Kornreich  each control a Delaware  corporation,
Michael Marocco controls a New York corporation, and and Andrew Sandler controls
a Delaware limited liabilty company. Each of such entity is a general partner of
SCM. SCM is the general partner of SIP. SIP is a general partner of 21st CCT-EP.

        10.      (a)      21st  Century  Communications  Foreign  Partners,
                          L.P., a Delaware limited partnership.
                 (b)      Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                 (c)      Principal Occupation:  Investments.
                 (d)      No.
                 (e)      No.

                                       17

<PAGE>


     Harvey  Sandler,  and John Kornreich  each control a Delaware  corporation,
Michael Marocco controls a New York corporation, and and Andrew Sandler controls
a Delaware limited liabilty company. Each of such entity is a general partner of
SCM. SCM is the general partner of SIP. SIP is a general partner of 21st CCFP.

        11.        (a)    Sandler Associates, a limited partnership organized 
                          under the laws of the State of New York.
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal Occupation:  Investments.
                   (d)    No.
                   (e)    No.

     Harvey Sandler, John Kornreich,  Michael Marocco and Andrew Sandler are the
general  partners  of  Sandler  Associates.  The  limited  partners  of  Sandler
Associates include certain other investors.

         12.       (a)    J.K. Media, L.P., a limited partnership  organized
                          under  the  laws  of  the  State  of New  York  ("J.K.
                          Media").
                   (b)    Address:
                          767 Fifth Avenue, 45th Floor
                          New York, New York 10153
                   (c)    Principal Occupation:  Investments.
                   (d)    No.
                   (e)    No.

                   John Kornreich is the general partner of J.K. Media.

  ITEM 3.       Source and Amount of Funds or Other Consideration.

     The source of funds for the  acquisition  of the securities was the general
working capital of the SCP IV Funds, the personal funds of the Individuals,  the
general  working  capital of SCM,  the  general  working  capital of each of the
various managed accounts, the general working capital of the 21st Century Funds,
the general  working  capital of Sandler  Associates,  and the  general  working
capital of J.K. Media.

                                       18

<PAGE>



     The amount of funds used in  acquiring  the shares of Common Stock that are
issued and  outstanding  and that are  issuable  on  conversion  of the Series C
Preferred Stock is set forth below:


  Reporting Person               Number of Shares of           Purchase Price 
                                Common Stock directly            (in dollars)
                                   owned or held
  Sandler Capital Partners IV,       2,754,545                 $15,150,000.00
  L.P.
  Sandler Capital Partners IV FTE    1,131,818                   6,225,000.00
  L.P.
  Harvey Sandler                       113,636                     625,000.00
  John Kornreich (1)                    26,205                     250,000.00
  Michael J. Marocco                    36,364                     200,000.00
  Andrew Sandler                         9,091                      50,000.00
  Sandler Capital Management           348,000                   2,732,381.20
  21st Century Communications          244,085                   1,306,825.58
  Partners, L.P.
  21st Century Communications           83,050                     410,793.06
  T-E Partners, L.P.
  21st Century Communications           32,865                     162,561.36
  Foreign Partners, L.P.
  Sandler Associates                   145,000                   1,156,364.80
  J.K. Media, L.P.                      45,000                     380,425.00

  -----------------
(1) Includes  750 shares of Common Stock issued to John  Kornreich as an outside
director of Issuer under the Issuer's Non-Employee  Directors' Stock Option Plan
(the "Outside  Directors' Option Plan") that have vested as of June 29, 1998 and
are  exercisable  at a price of $4.125 per share.  John  Kornreich was issued an
aggregate of 3,000  options to purchase  shares of Common Stock upon becoming an
outside  director  of the Issuer on June 29,  1998,  of which 750 shares  vested
immediately,  with the  remainder to vest in equal  increments  of 750 shares on
June 29, 1999, 2000 and 2001, respectively.


                                       19

<PAGE>



  ITEM 4.     Purpose of Transaction.

        The reporting  persons  acquired  their  securities  for the purposes of
investment.

        The reporting persons do not have any plans or proposals which relate to
  or would result in any of the actions set forth in  subparagraphs  (a) through
  (j) of Item 4 of Schedule 13D.

  ITEM 5.     Interests in Securities of the Issuer.

        (a) The following  list sets forth the aggregate  number and  percentage
  (based on  20,958,570  shares of Common Stock  outstanding, as reported by the
  Issuer to the reporting  persons as of June 1, 1998, and  4,090,909  shares of
  Common Stock issuable on conversion of the Series C Preferred Stock) of shares
  of Common Stock, as converted,  owned  beneficially  by each reporting  person
  named in Item 2, as of July 8, 1998:

 
  Reporting Person               Number of Shares of        Percentage of Shares
                                  Common Stock               of Common Stock
                                 Beneficially Owned          Beneficially Owned

  Sandler Capital Partners IV,    2,754,545 (as converted)         11.0%
  L.P.
  Sandler Capital Partners IV FTE 1,131,818 (as converted)          4.5%
  L.P.
  Harvey Sandler (1) (2) (3) (5)  4,853,000 (as converted)         19.4%
  John Kornreich (1) (2) (3) (4)  4,830,569 (as converted)         19.3%
  (5)
  Michael J. Marocco (1) (2) (3)  4,775,728 (as converted)         19.1%
  (5)
  Andrew Sandler (1) (2) (3) (5)  4,748,455 (as converted)         19.0%
  Sandler Capital Management      4,594,364 (as converted)         18.3%
  (1) (2)
  21st Century Communications       244,085                         1.0%
  Partners, L.P.
  21st Century Communications        83,050                          .3%
  T-E Partners, L.P.
  21st Century Communications        32,865                          .1%
  Foreign Partners, L.P.
  Sandler Associates                145,000                          .6%
  J.K. Media, L.P.                   45,000                          .2%

                                       20

<PAGE>


  ------------------
  (1)   Includes 3,886,363 shares of Common Stock, as converted, held by the SCP
        IV Funds.

  (2)   Includes 360,000 shares of Common Stock held by the 21st Century Funds.

  (3)   Includes 145,000 shares of Common Stock owned by Sandler Associates.

  (4)   Includes 45,000 shares of Common  Stock owned by J.K.  Media and  vested
        options for 750 shares of Common Stock  issued to John  Kornreich  as an
        outside  director of  the Issuer  under the Issuer's Outside Directors' 
        Option Plan.

  (5)   The reporting person disclaims beneficial ownership of these securities,
        except to the extent of his/her/its equity interest therein.

        (b)    By virtue of being the manager of certain  accounts owning shares
  of Common Stock with respect to which SCM exercises investment discretion, and
  a general partner of SIP, which is a general partner of the 21st Century Funds
  and the SCP IV Funds,  SCM may be deemed to have sole or shared  power to vote
  and to dispose of 4,594,363 shares of Common Stock, as converted, representing
  approximately 18.3% of the Common Stock, as converted.

               By virtue of being the sole  shareholder  of ARH Corp.  and a
  general  partner of Sandler  Associates,  Harvey Sandler may be deemed to have
  sole or shared  power to vote and to  dispose  of  4,853,000  shares of Common
  Stock,  as  converted,  representing  approximately  19.4% of the  outstanding
  Common Stock.

               By virtue of being the majority shareholder of Four JK Corp. and 
  a general partner of Sandler Associates and J.K. Media,  John Kornreich may be
  deemed to have sole or shared power to vote and to dispose of 4,830,569 shares
  of Common Stock, as converted, representing approximately 19.3% of the 
  outstanding Common Stock.

               By virtue of being the sole shareholder of MJDM Corp. and a 
  general partner of Sandler  Associates,  Michael J.  Marocco may be deemed to
  have sole or shared power to vote and to dispose of 4,755,728 shares of Common
  Stock, as converted,  representing approximately 19.1% of the Common Stock, as
  converted.


                                       21

<PAGE>



               By virtue of being a majority  member of ALSI, LLC and a general
partner of Sandler Associates, Andrew Sandler may be deemed to have sole or 
shared power to vote and to dispose of 4,748,455 shares of Common Stock, as  
converted, representing approximately 19.0% of the outstanding Common Stock.

        (c)    The following is a description of all  transactions in the shares
of Common Stock by the persons identified in Item 2 of this Schedule 13D 
effected from May 8, 1998 through July 8, 1998, inclusive:


  Name of             Purchase or    Number of Shares         Purchase or Sale
  Shareholder         Sale Date      of Common Stock          Price Per Share
                                     Purchased or Sold

  Sandler Capital       6/29/98        2,754,545                  $5.50
  Partners IV, L.P.                    (as converted)
  Sandler Capital       6/29/98        1,131,818                  $5.50
  Partners IV FTE, L.P.                (as converted)
  Harvey Sandler        6/29/98          113,636                  $5.50
                                       (as converted)
  John Kornreich        6/29/98           45,455                  $5.50
                                       (as converted)
  Michael J. Marocco    6/29/98           36,363                  $5.50
                                       (as converted)
  Andrew Sandler        6/29/98            9,091                  $5.50
                                       (as converted)

              All  purchases  of  Series  C  Convertible  Preferred  Stock  were
  effected by private placement.

              (d)   No other person has the right to receive or the power to 
  direct the receipt of dividends from, or the proceeds from  the sale  of such
  securities.

              (e)   Not applicable.

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

        Not Applicable.


                                       22

<PAGE>



  ITEM 7.     Material to be filed as Exhibits.

        Exhibit           7.01 Joint Filing  Agreement,  effective as of July 8,
                          1998,  among the reporting  persons by which they have
                          agreed to file  this  Schedule  13D and all  necessary
                          amendments, as required by Rule 13d-1(f).


                                       23

<PAGE>



                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

                        SANDLER CAPITAL PARTNERS IV, L.P.

                        By:   Sandler Investment Partners, L.P., General Partner
                    
                              By:  Sandler Capital Management, General Partner

                                   By:  MJDM Corp., a General Partner



                  July 8, 1998     By:  /s/ Edward G. Grinacoff
                 ---------------        ------------------------
                      Date              Edward G. Grinacoff
                                        President

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).


                                       24

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                                  SANDLER CAPITAL PARTNERS IV FTE, L.P.

                                  By:   Sandler Investment Partners, L.P., 
                                        General Partner

                                        By:  Sandler Capital Management, General
                                             Partner

                                             By:  MJDM Corp., a General Partner



                 July 8, 1998                By:  /s/ Edward G. Grinacoff
                --------------                    ------------------------
                     Date                         Edward G. Grinacoff
                                                  President

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       25

<PAGE>




                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.





                 July 8, 1998                By:  /s/ Harvey Sandler
                 --------------                   --------------------
                     Date                         Harvey Sandler

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       26

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.





                 July 8, 1998                By:  /s/ John Kornreich
                 --------------                   --------------------
                     Date                         John Kornreich

                
  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       27

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.




                 July 8, 1998                By:  /s/ Michael J. Marocco
                 --------------                   --------------------
                     Date                         Michael J.Marocco

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       28

<PAGE>



                                    SIGNATURE

                 After  reasonable  inquiry and to the best of my knowledge  and
  belief,  I certify that the  information  set forth in this statement is true,
  complete and correct.





                 July 8, 1998                By:  /s/ Andrew Sandler
                 --------------                   --------------------
                     Date                         Andrew Sandler

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       29

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                                           SANDLER CAPITAL MANAGEMENT

                                                  By:  MJDM Corp., a General 
                                                       Partner



                 July 8, 1998                     By:  /s/ Edward G. Grinacoff
                --------------                         --------------------
                      Date                             Edward G. Grinacoff
                                                       President

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       30
<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                              21ST CENTURY COMMUNICATIONS PARTNERS,L.P.

                                   By:  Sandler Investment Partners, L.P.,
                                        General Partner

                                        By:  Sandler Capital Management,
                                             General Partner

                                             By:  MJDM Corp., a General Partner



                   July 8, 1998              By:  /s/ Edward G. Grinacoff
                  --------------                  --------------------  
                    Date                          Edward G. Grinacoff
                                                  President

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       31

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                              21ST CENTURY COMMUNICATIONS T-E PARTNERS, L.P.

                                   By:  Sandler Investment Partners, L.P.,
                                        General Partner

                                        By:  Sandler Capital Management,
                                             General Partner

                                             By:  MJDM Corp., a General Partner



                   July 8, 1998              By:  /s/ Edward G. Grinacoff
                  --------------                  --------------------  
                    Date                          Edward G. Grinacoff
                                                  President

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       32

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                              21ST CENTURY COMMUNICATIONS FOREIGN PARTNERS, L.P.

                                   By:  Sandler Investment Partners, L.P.,
                                        General Partner

                                        By:  Sandler Capital Management,
                                             General Partner

                                             By:  MJDM Corp., a General Partner



                   July 8, 1998              By:  /s/ Edward G. Grinacoff
                  --------------                  --------------------  
                    Date                          Edward G. Grinacoff
                                                  President

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       33

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                                     SANDLER ASSOCIATES

                                        By:  Harvey Sandler, General Partner


                   July 8, 1998              /s/ Harvey Sandler
                   -------------             -----------------------
                      Date                   Harvey Sandler

                                        By:  John Kornreich, General Partner


                                             /s/ John Kornreich
                                             -----------------------
                                             John Kornreich

                                        By:  Michael J. Marocco, General Partner


                                             /s/ Michael J. Marocco
                                             -----------------------
                                             Michael J. Marocco

                                        By:  Andrew Sandler, General Partner


                                             /s/ Andrew Sandler
                                             -----------------------
                                             Andrew Sandler

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).

                                       34

<PAGE>



                                    SIGNATURE

        After  reasonable  inquiry and to the best of my knowledge and belief, I
  certify that the information set forth in this statement is true, complete and
  correct.

                                   J.K. MEDIA, L.P.

                                        By:  John Kornreich, General Partner



              July 8, 1998              /s/ John Kornreich
              -------------             -----------------------
                 Date                   John Kornreich

  ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT
  CONSTITUTE FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).


                                       35


  EXHIBIT 7.01

                             JOINT FILING AGREEMENT

        In accordance  with Rule 13d-1(f) under the Securities  Exchange Act, as
  amended, the undersigned hereby agree to the joint filing on behalf of each of
  them on a statement  on  Schedule  13D  (including  amendments  thereto)  with
  respect to the Common Stock, par value $.01 per share, of Arch  Communications
  Group,  Inc.  and that this  Agreement be included as an Exhibit to such joint
  filing.

        This Joint Filing Agreement may be executed in one or more counterparts,
  and  each  such  counterpart  shall be an  original  but all of  which,  taken
  together, shall constitute but one and the same instrument.

        IN WITNESS  WHEREOF,  the  undersigned  hereby  execute  this  Agreement
  effective as of the 8th day of July, 1998.

                         SANDLER CAPITAL PARTNERS IV, L.P.

                              By:  Sandler Investment Partners,L.P., 
                                   General Partner

                                   By:  Sandler Capital Management, General
                                        Partner

                                        By:  MJDM Corp., a General Partner


                                        By:  /s/ Edward G. Grinacoff
                                             -----------------------
                                             Edward G. Grinacoff
                                             President


                         SANDLER CAPITAL PARTNERS IV FTE, L.P.

                              By:  Sandler Investment Partners, L.P., 
                                   General Partner

                                   By:  Sandler Capital Management, 
                                        General Partner

                                        By:  MJDM Corp., a General Partner


                                        By:  /s/ Edward G. Grinacoff
                                             -----------------------
                                             Edward G. Grinacoff
                                             President

<PAGE>

                              By:  /s/ Harvey Sandler
                                   -----------------------
                                   HARVEY SANDLER


                              By:  /s/ John Kornreich
                                   -----------------------
                                   JOHN KORNREICH


                              By:  /s/ Michael J. Marocco
                                   -----------------------
                                   MICHAEL J. MAROCCO


                              By:  /s/ Andrew Sandler
                                   -----------------------
                                   ANDREW SANDLER


                              SANDLER CAPITAL MANAGEMENT

                              By:  MJDM Corp., a General Partner


                              By:  /s/ Edward G. Grinacoff
                                   -----------------------
                                   Edward G. Grinacoff
                                   President


                              21ST CENTURY COMMUNICATIONS PARTNERS, L.P.

                              By:  Sandler Investment Partners, L.P., 
                                   General Partner

                                   By:  Sandler Capital Management, 
                                        General Partner

                                        By:  MJDM Corp., a General Partner


                                        By:  /s/ Edward G. Grinacoff
                                             -----------------------
                                             Edward G. Grinacoff
                                             President


<PAGE>



                              21ST CENTURY COMMUNICATIONS T-E PARTNERS, L.P.

                              By:  Sandler Investment Partners, L.P., 
                                   General Partner

                                   By:  Sandler Capital Management,
                                        General Partner

                                        By:  MJDM Corp., a General Partner


                                        By:  /s/ Edward G. Grinacoff
                                             -----------------------
                                             Edward G. Grinacoff
                                             President


                              21ST CENTURY COMMUNICATIONS FOREIGN PARTNERS, L.P.

                              By:  Sandler Investment Partners, L.P., 
                                   General Partner

                                   By:  Sandler Capital Management,
                                        General Partner

                                        By:  MJDM Corp., a General Partner


                                        By:  /s/ Edward G. Grinacoff
                                             -----------------------
                                             Edward G. Grinacoff
                                             President


<PAGE>


                              SANDLER ASSOCIATES

                              By:  Harvey Sandler, General Partner


                                   /s/ Harvey Sandler
                                   ------------------------
                                   Harvey Sandler

                              By:  John Kornreich, General Partner


                                   /s/ John Kornreich
                                   ------------------------
                                   John Kornreich

                              By:  Michael J. Marocco, General Partner


                                   /s/ Michael J. Marocco
                                   ------------------------
                                   Michael J. Marocco

                              By:  Andrew Sandler, General Partner


                                   /s/ Andrew Sandler
                                   ------------------------
                                   Andrew Sandler


                              J.K. MEDIA, L.P.

                              By:  John Kornreich, General Partner


                                   /s/ John Kornreich
                                   ------------------------
                                   John Kornreich


  ATTENTION:  INTENTIONAL  MISSTATEMENTS  OR OMISSIONS OF FACT
  CONSTITUTE  FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).



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