Document:

<PAGE>   1
                                                                     Exhibit 4.3

                            SIXTH AMENDMENT AGREEMENT

     THIS SIXTH AMENDMENT AGREEMENT (the "Agreement") is entered as of April 20,
2001 between SHARED TECHNOLOGIES CELLULAR, INC., a Delaware corporation, with
its principal place of business at 100 Great Meadow Road, Suite 104,
Wethersfield, Connecticut 06109 (the "Borrower") and MOBILE INVESTMENTS LLC, a
Connecticut limited liability company with an address at c/o Oakes, Fitzwilliams
& Co., Inc., c/o Speer & Fulvio, 60 East 42nd Street, New York, NY 10165
("Mobile" or "Lender").

                                    RECITALS:

     On July 7, 1999, State Street Bank and Trust Company ("State Street") and
the Borrower entered into a Loan Agreement, as amended by that certain First
Amendment Agreement dated as of December 3, 1999, that certain Second Amendment
Agreement dated as of May 1, 2000, that certain Third Amendment Agreement dated
August 8, 2000, and that certain Fourth Amendment Agreement dated March 1, 2001
(referred to herein collectively as the "Credit Agreement"). State Street
assigned its interest in the Credit Agreement, the loans made thereunder, and
the documents executed in connection therewith to Citizens Bank of Massachusetts
("Citizens"), pursuant to which Citizens extended to the Borrower a Revolving
Credit Facility.

      The Borrower executed and delivered to State Street on July 7, 1999 a
Secured Revolving Credit Promissory Note in the original principal amount of Ten
Million Dollars ($10,000,000.00), which was amended and restated by that certain
Amended and Restated Secured Revolving Credit Promissory Note in the original
principal amount of Five Million Dollars ($5,000,000.00) dated May 1, 2000
delivered to Citizens and that certain Amended and Restated Secured Revolving
Credit Promissory Note in the original principal amount of Two Million Five
Hundred Thousand Dollars ($2,500,000.00) dated August 8, 2000 delivered to
Citizens (collectively the "Original Note").

     Pursuant to a Nonrecourse Assignment and Acceptance agreement dated as of
March 1, 2001, Citizens assigned its interest in said Loan to Anthony Autorino.
Anthony Autorino assigned the Loan to Mobile pursuant to a certain Nonrecourse
Assignment and Acceptance agreement dated March 14, 2001.

     Pursuant to said Fourth Amendment Agreement, Citizens agreed to hold all
collateral securing the obligations of the Borrower under the Credit Agreement
and the Retained Letter of Credit as agent for itself and Mobile, (the
"Collateral Agent") pursuant to the terms thereof. As of March 29, 2001 Citizens
has resigned as Collateral Agent and has assigned all of its interests in the
Credit Agreement and the collateral pledged thereby to Mobile. On March 30,
2001, Mobile and the Borrower entered into a Fifth Amendment Agreement under
which Citizens resigned as Agent and the parties further amended the Credit
Agreement.

     The parties have agreed to further amend the Credit Agreement upon the
terms and conditions set forth herein.

                                       1
<PAGE>   2
     NOW, THEREFORE, in consideration of the provisions herein contained,
Borrower and the Lender, each intending to be legally bound hereby, agree as
follows:

SECTION I.  AMENDMENTS TO CREDIT AGREEMENT.

     The Credit Agreement is amended hereby as follows:

     1.   Notwithstanding the terms of the Fourth Amendment Agreement, Mobile
shall make an Advance of $850,000 on the date hereof.

     2.   The following new definitions are added to the Credit Agreement:

               "Sixth Amendment Agreement" shall mean that certain Sixth
          Amendment Agreement entered into between the Borrower and the Lender
          dated as of April 20, 2001."

     3.   This Agreement, the Credit Agreement, Note and all Security Documents
shall be governed by the laws of the State of Connecticut, including its
conflict of laws principles.

SECTION II. RECONFIRMATION OF COVENANTS, REPRESENTATIVES AND WARRANTIES.

     1.   The Borrower further reaffirms all of its obligations, as amended
hereby, under the Credit Agreement, and under the Security Documents.

     2.   Borrower represents and agrees that, in addition to the amounts
advanced in Section I.2. above, there is currently outstanding the principal
amount of $1,628,006.96 under the Credit Agreement and Original Note (but not
including the advance made hereunder), together with accrued interest thereon
from March 31, 2001 ($542.67 per diem), legal fees and accounting fees of
$25,000, all of which are due and owing without setoff, defense, or
counterclaim, and Borrower hereby waives any such setoff, defense or
counterclaim it may have against Mobile.

SECTION III.  RESERVATION OF RIGHTS.

     Mobile and the Borrower agree that:

               i)   This Agreement evidences solely the amendment of the terms
     and provisions of the Borrower's obligations under the Credit Agreement and
     the Original Note, and is not a novation or discharge thereof; and

               ii)  Except for this Amendment, and the other documents executed
     in connection herewith, there are no other understandings, express or
     implied between Mobile and the Borrower regarding the Credit Agreement and
     the Original Note.

                                       2
<PAGE>   3
SECTION IV.  EFFECT OF AMENDMENT.

     1.   Except as amended hereby, the Credit Agreement and the Original Note
and all other documents entered into in connection therewith shall:

          a)   remain in full force and effect in accordance with their original
terms and nothing herein shall be deemed to modify, abrogate, waive or extend
any other provision in the Credit Agreement and the Original Note or in any
other document, agreement or instrument executed in connection therewith or
pursuant thereto prior to the execution of this Agreement, including without
limitation any of the Borrower's liabilities to Mobile or any of Mobile's rights
with respect to such liabilities; and

          b)   be in all respects ratified and affirmed.

     2.   The Borrower acknowledges that all of the liabilities and obligations
of the Borrower to Mobile now existing and hereafter incurred are secured by the
security described in the Security Documents defined in the Credit Agreement;
the Borrower further acknowledges that Mobile is relying upon the security
described above, both as entered into on July 9, 1999 and as entered into from
time to time thereafter, as security for the financing represented by the
Liabilities and as security for all other obligations of the Borrower to Mobile.

SECTION V.  WAIVER.

     Mobile hereby waives all existing Events of Default under the Credit
Agreement, with the express stipulation that this Waiver shall not operate as a
waiver of any other failure by the Borrower to meet other covenants of which
Mobile does not have notice as of the date hereof, or waiver of the failure of
the Borrower to meet the same covenants on a future occasion.

     Such Waiver shall not be construed as a course of action which would
constitute a waiver of any other default under the Credit Agreement or under any
other document executed in connection therewith or pursuant thereto. No delay in
taking any action with respect to any such default, or any other course of
action by Mobile shall affect Mobile's rights to later take any such action with
respect to any such default.

SECTION VI.  GENERAL.

     1.   Construction. Except as amended hereby, incorporated herein by
reference are the representations, warranties, agreements, affirmative and
negative covenants, definitions, terms and conditions all as set forth in the
Credit Agreement and the Original Note and all documents executed in connection
therewith or pursuant thereto. This Agreement, the Credit Agreement, the
Original Note, and the other Loan Documents shall be construed collectively and
in the event that any term, provision or condition of any of such documents is
inconsistent with or contradictory to any term, provision

                                       3
<PAGE>   4
or condition of any other such document, the terms, provisions and conditions of
this Agreement shall supersede and control the terms, provisions and conditions
of the Credit Agreement and the Original Note.

     2.   Governing Law. This Agreement, the Original Note and the Credit
Agreement and all Security Documents thereunder, and the rights and obligations
of the parties hereunder, shall in all respects be governed by, and interpreted
and determined in accordance with, the laws of the State of Connecticut
(excluding the laws applicable to conflicts or choice of law).

SECTION VII.  SECURITY DOCUMENTS.

     The Borrower and The Cellular Hotline, Inc., each with respect to
itself, by its signature hereto, agree that:

          a)   the Security Documents (defined in the Credit Agreement) are
amended to reflect that the obligations and liabilities secured thereby are
deemed amended pursuant to this Agreement and the Amendment to Note, as
incorporated therein by reference; and

          b)   except as specifically amended hereby and by all other documents
executed in connection herewith, the Security Documents shall remain in full
force and effect, in accordance with their original terms as previously amended,
and nothing herein shall be deemed to modify, abrogate, waive or extend any
other provision in the Security Documents, except as previously amended, or in
any other document, agreement, or instrument executed in connection therewith or
pursuant thereto prior to the execution of this Agreement, including without
limitation any of the Borrower's or The Cellular Hotline, Inc.'s liabilities to
the Lender or any of the Lender's rights with respect to such liabilities; and

          c)   the Security Documents, as amended hereby and by such other
documents executed in connection herewith, shall continue to secure the
Borrower's obligations under the Credit Agreement, the Original Note as amended,
and all other obligations of the Borrower and of The Cellular Hotline, Inc. to
the Lender, whether now existing or hereafter arising.

SECTION VIII.  WAIVER OF TRIAL BY JURY.

     BORROWER, THE CELLULAR HOTLINE, INC., AND LENDER MUTUALLY HEREBY KNOWINGLY,
VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT TO A TRIAL BY JURY IN RESPECT OF
ANY CLAIM BASED HEREIN, ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS
AGREEMENT OR ANY OTHER LOAN DOCUMENTS CONTEMPLATED TO BE EXECUTED IN CONNECTION
HEREWITH OR ANY COURSE OF CONDUCT, COURSE OF DEALINGS, STATEMENTS (WHETHER
VERBAL OR WRITTEN) OR ACTIONS OF ANY PARTY. THIS WAIVER

                                       4
<PAGE>   5
CONSTITUTES A MATERIAL INDUCEMENT FOR THE LENDER TO ACCEPT THIS AGREEMENT AND TO
AMEND THE REVOLVING CREDIT FACILITY.

             [THE BALANCE OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

                                       5
<PAGE>   6
      IN WITNESS WHEREOF, the Lender and the Borrower have caused their duly
authorized officers to execute this Agreement as of the day and year first above
written as an instrument under seal.

WITNESS:                           SHARED TECHNOLOGIES CELLULAR, INC.

/s/ J. Rieber                      By:  /s/ Anthony D. Autorino
-------------                           -----------------------
                                        Name: Anthony D. Autorino
                                        Title: CEO

                                   MOBILE INVESTMENTS LLC

                                   By:   Oakes, Fitzwilliams & Co., Inc.
                                         Its Manager

/s/ Anthony Mao                    By:  /s/ Herbert L. Oakes, Jr.
---------------                         -------------------------
                                        Herbert L. Oakes, Jr.
                                        Its President

                            CONSENT AND CONFIRMATION

     The undersigned consents to the amendment of the Credit Agreement pursuant
to the Sixth Amendment Agreement, and the terms of the Sixth Amendment
Agreement, and of all underlying documents referred to therein and all documents
entered into pursuant thereto or in connection therewith.

     The undersigned confirms its obligations under that certain Guaranty dated
as of July 7, 1999 (the "Guaranty"), executed by the undersigned, of all
Liabilities (as defined in the Guaranty), as amended hereby, of the Borrower to
the Lender, and confirms its obligations under all documents securing the
Guaranty.

     IN WITNESS WHEREOF, the undersigned has caused its duly authorized officer
to execute this Consent and Confirmation as an instrument under Seal.

WITNESS:                                 THE CELLULAR HOTLINE, INC.

/s/ J. Rieber                            By:  /s/ Anthony D. Autorino
-----------------                             -----------------------
                                              Name: Anthony D. Autorino
                                              Its: President

                                       6
<PAGE>   7
                  [NOTARIZATIONS FOR SIGNATURES ON PRIOR PAGE]

STATE OF CONNECTICUT    )
                        )   ss. Wethersfield
COUNTY OF HARTFORD      )

     In Wethersfield on the 20th day of April, 2001, before me personally
appeared the above-named Anthony D. Autorino, CEO of SHARED TECHNOLOGIES
CELLULAR, INC. to me known and known by me to be the party executing the
foregoing instrument on behalf of said corporation and acknowledged said
instrument so executed to be his free act and deed in said capacity and the free
act and deed of said corporation.

                                         /s/ Nancy J. Morrin
                                         -------------------
                                         Notary Public
                                         My Commission Expires: August 31, 2004

STATE OF CONNECTICUT    )
                        )  ss. Wethersfield
COUNTY OF HARTFORD      )

     In Wethersfield on the 20th day of April, 2001, before me personally
appeared the above-named Anthony D. Autorino, President of THE CELLULAR HOTLINE,
INC. to me known and known by me to be the party executing the foregoing
instrument on behalf of said corporation and acknowledged said instrument so
executed to be his free act and deed in said capacity and the free act and deed
of said corporation.

                                         /s/ Nancy J. Morrin
                                         -------------------
                                         Notary Public
                                         My Commission Expires: August 31, 2004

                                       7
<PAGE>   8
STATE OF                )
                        )  ss.
COUNTY OF               )

     In London, England on the 20th day of April, 2001, before me personally
appeared the above-named Herbert L. Oakes, Jr., the President of Oakes,
Fitzwilliams & Co., Inc., Manager of Mobile Investments LLC to me known and
known by me to be the party executing the foregoing instrument on behalf of
said Lender and acknowledged said instrument so executed to be his free act
and deed in said capacity and the free act and deed of said Lender.

                                         /s/ Anthony Mao
                                         ---------------
                                         Commissioner for Oaths

                                       8<PAGE>   1
                                                                     EXHIBIT 4.4

                           SEVENTH AMENDMENT AGREEMENT

         THIS SEVENTH AMENDMENT AGREEMENT (the "Agreement") is entered as of May
2, 2001 between SHARED TECHNOLOGIES CELLULAR, INC., a Delaware corporation, with
its principal place of business at 100 Great Meadow Road, Suite 104,
Wethersfield, Connecticut 06109 (the "Borrower") and MOBILE INVESTMENTS LLC, a
Connecticut limited liability company with an address at c/o Oakes, Fitzwilliams
& Co., Inc., c/o Speer & Fulvio, 60 East 42nd Street, New York, New York 10165
("Mobile" or "Lender").

                                    RECITALS:

         On July 7, 1999, State Street Bank and Trust Company ("State Street")
and the Borrower entered into a Loan Agreement, as amended by that certain First
Amendment Agreement dated as of December 3, 1999, that certain Second Amendment
Agreement dated as of May 1, 2000, that certain Third Amendment Agreement dated
August 8, 2000, and that certain Fourth Amendment Agreement dated March 1, 2001
(referred to herein collectively as the "Credit Agreement"). State Street
assigned its interest in the Credit Agreement, the loans made thereunder, and
the documents executed in connection therewith to Citizens Bank of Massachusetts
("Citizens"), pursuant to which Citizens extended to the Borrower a Revolving
Credit Facility.

         The Borrower executed and delivered to State Street on July 7, 1999 a
Secured Revolving Credit Promissory Note in the original principal amount of Ten
Million Dollars ($10,000,000.00), which was amended and restated by that certain
Amended and Restated Secured Revolving Credit Promissory Note in the original
principal amount of Five Million Dollars ($5,000,000.00) dated May 1, 2000
delivered to Citizens and that certain Amended and Restated Secured Revolving
Credit Promissory Note in the original principal amount of Two Million Five
Hundred Thousand Dollars ($2,500,000.00) dated August 8, 2000 delivered to
Citizens (collectively the "Original Note").

         Pursuant to a Nonrecourse Assignment and Acceptance Agreement dated as
of March 1, 2001, Citizens assigned its interest in said Loan to Anthony
Autorino. Anthony Autorino assigned the Loan to Mobile pursuant to a certain
Nonrecourse Assignment and Acceptance Agreement dated March 14, 2001.

         Pursuant to said Fourth Amendment Agreement, Citizens agreed to hold
all collateral securing the obligations of the Borrower under the Credit
Agreement and the Retained Letter of Credit as agent for itself and Mobile, (the
"Collateral Agent") pursuant to the terms thereof. As of March 29, 2001 Citizens
has resigned as Collateral Agent and has assigned all of its interests in the
Credit Agreement and the collateral pledged thereby to Mobile. On March 30,
2001, Mobile and the Borrower entered into a Fifth Amendment Agreement under
which Citizens resigned as Agent and the parties further amended the Credit
Agreement on April 20, 2001, Mobile and Borrower entered into a Sixth Amendment
Agreement under which the parties further amended the Credit Agreement.

         The parties have agreed to further amend the Credit Agreement upon the
terms and conditions set forth herein.

                                       1
<PAGE>   2
         NOW, THEREFORE, in consideration of the provisions herein contained,
Borrower and the Lender, each intending to be legally bound hereby, agree as
follows:

SECTION I. AMENDMENTS TO CREDIT AGREEMENT.

         The Credit Agreement is amended hereby as follows:

         1.       Notwithstanding the terms of the Fourth Amendment Agreement,
Mobile shall make an Advance of $600,000.00 on the date hereof.

         2.       The following new definitions are added to the Credit
Agreement:

                           "Seventh Amendment Agreement" shall mean that certain
                  Sixth Amendment Agreement entered into between the Borrower
                  and the Lender dated as of May 2, 2001."

         3.       The Note is amended pursuant to an Amendment to Note of even
date herewith which increases the principal amount thereof to $3,078,006.96.

SECTION II. RECONFIRMATION OF COVENANTS, REPRESENTATIVES AND WARRANTIES.

         1.       The Borrower further reaffirms all of its obligations, as
amended hereby, under the Credit Agreement, and under the Security Documents.

         2.       Borrower represents and agrees that, in addition to the
amounts advanced in Section I.2. above, there is currently outstanding the
principal amount of $2,478,006.96 under the Credit Agreement and Original Note
(but not including the advance made hereunder), together with accrued interest
of $21,308.09 thereon through May 2, 2001 ($826.03per diem), legal fees and
accounting fees of $25,000, all of which are due and owing without setoff,
defense, or counterclaim, and Borrower hereby waives any such setoff, defense or
counterclaim it may have against Mobile.

SECTION III. RESERVATION OF RIGHTS.

         Mobile and the Borrower agree that:

                  i)       This Agreement evidences solely the amendment of the
         terms and provisions of the Borrower's obligations under the Credit
         Agreement and the Original Note, and is not a novation or discharge
         thereof; and

                  ii)      Except for this Amendment, and the other documents
         executed in connection herewith, there are no other understandings,
         express or implied between Mobile and the Borrower regarding the Credit
         Agreement and the Original Note.

SECTION IV. EFFECT OF AMENDMENT.

                                       2
<PAGE>   3
         1.       Except as amended hereby, the Credit Agreement and the
Original Note and all other documents entered into in connection therewith
shall:

                  a)       remain in full force and effect in accordance with
their original terms and nothing herein shall be deemed to modify, abrogate,
waive or extend any other provision in the Credit Agreement and the Original
Note or in any other document, agreement or instrument executed in connection
therewith or pursuant thereto prior to the execution of this Agreement,
including without limitation any of the Borrower's liabilities to Mobile or any
of Mobile's rights with respect to such liabilities; and

                  b)       be in all respects ratified and affirmed.

         2.       The Borrower acknowledges that all of the liabilities and
obligations of the Borrower to Mobile now existing and hereafter incurred are
secured by the security described in the Security Documents defined in the
Credit Agreement; the Borrower further acknowledges that Mobile is relying upon
the security described above, both as entered into on July 9, 1999 and as
entered into from time to time thereafter, as security for the financing
represented by the Liabilities and as security for all other obligations of the
Borrower to Mobile.

SECTION V. WAIVER.

         Mobile hereby waives all existing Events of Default under the Credit
Agreement, with the express stipulation that this Waiver shall not operate as a
waiver of any other failure by the Borrower to meet other covenants of which
Mobile does not have notice as of the date hereof, or waiver of the failure of
the Borrower to meet the same covenants on a future occasion.

         Such Waiver shall not be construed as a course of action which would
constitute a waiver of any other default under the Credit Agreement or under any
other document executed in connection therewith or pursuant thereto. No delay in
taking any action with respect to any such default, or any other course of
action by Mobile shall affect Mobile's rights to later take any such action with
respect to any such default.

SECTION VI. GENERAL.

         1.       Construction. Except as amended hereby, incorporated herein by
reference are the representations, warranties, agreements, affirmative and
negative covenants, definitions, terms and conditions all as set forth in the
Credit Agreement and the Original Note and all documents executed in connection
therewith or pursuant thereto. This Agreement, the Credit Agreement, the
Original Note, the Amendment to Note and the other Loan Documents shall be
construed collectively and in the event that any term, provision or condition of
any of such documents is inconsistent with or contradictory to any term,
provision or condition of any other such document, the terms, provisions and
conditions of this Agreement shall supersede and control the terms, provisions
and conditions of the Credit Agreement and the Original Note.

         2.       Governing Law. This Agreement, the Original Note and the
Credit Agreement and all Security Documents thereunder, and the rights and
obligations of the parties hereunder, shall in all respects be governed by, and
interpreted and determined in accordance with, the laws of the State of
Connecticut (excluding the laws applicable to conflicts or choice of law).

                                       3
<PAGE>   4
SECTION VII. SECURITY DOCUMENTS.

         The Borrower and The Cellular Hotline, Inc., each with respect to
itself, by its signature hereto, agree that:

                  a)       the Security Documents (defined in the Credit
Agreement) are amended to reflect that the obligations and liabilities secured
thereby are deemed amended pursuant to this Agreement and the Amendment to Note,
as incorporated therein by reference; and

                  b)       except as specifically amended hereby and by all
other documents executed in connection herewith, the Security Documents shall
remain in full force and effect, in accordance with their original terms as
previously amended, and nothing herein shall be deemed to modify, abrogate,
waive or extend any other provision in the Security Documents, except as
previously amended, or in any other document, agreement, or instrument executed
in connection therewith or pursuant thereto prior to the execution of this
Agreement, including without limitation any of the Borrower's or The Cellular
Hotline, Inc.'s liabilities to the Lender or any of the Lender's rights with
respect to such liabilities; and

                  c)       the Security Documents, as amended hereby and by such
other documents executed in connection herewith, shall continue to secure the
Borrower's obligations under the Credit Agreement, the Original Note as amended,
and all other obligations of the Borrower and of The Cellular Hotline, Inc. to
the Lender, whether now existing or hereafter arising.

SECTION VIII. WAIVER OF TRIAL BY JURY.

         BORROWER, THE CELLULAR HOTLINE, INC., AND LENDER MUTUALLY HEREBY
KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT TO A TRIAL BY JURY IN
RESPECT OF ANY CLAIM BASED HEREIN, ARISING OUT OF, UNDER OR IN CONNECTION WITH
THIS AGREEMENT OR ANY OTHER LOAN DOCUMENTS CONTEMPLATED TO BE EXECUTED IN
CONNECTION HEREWITH OR ANY COURSE OF CONDUCT, COURSE OF DEALINGS, STATEMENTS
(WHETHER VERBAL OR WRITTEN) OR ACTIONS OF ANY PARTY. THIS WAIVER CONSTITUTES A
MATERIAL INDUCEMENT FOR THE LENDER TO ACCEPT THIS AGREEMENT AND TO AMEND THE
REVOLVING CREDIT FACILITY.

             [THE BALANCE OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

                                       4
<PAGE>   5
         IN WITNESS WHEREOF, the Lender and the Borrower have caused their duly
authorized officers to execute this Agreement as of the day and year first above
written as an instrument under seal.

WITNESS:                                    SHARED TECHNOLOGIES CELLULAR, INC.

/s/ Sharon E. Marone                        By: /s/ Ismael Pinho
--------------------                            ----------------
                                                Name: Ismael Pinho
                                                Title: CFO

                                            MOBILE INVESTMENTS LLC

                                            By: Oakes, Fitzwilliams & Co., Inc.
                                                Its Manager

/s/ Anthony Mao                             By: /s/ Herbert L. Oakes, Jr.
---------------                                 -------------------------
                                                Herbert L. Oakes, Jr.
                                                Its President

                            CONSENT AND CONFIRMATION

         The undersigned consents to the amendment of the Credit Agreement
pursuant to the Sixth Amendment Agreement, and the terms of the Seventh
Amendment Agreement, and of all underlying documents referred to therein and all
documents entered into pursuant thereto or in connection therewith.

         The undersigned confirms its obligations under that certain Guaranty
dated as of July 7, 1999 (the "Guaranty"), executed by the undersigned, of all
Liabilities (as defined in the Guaranty), as amended hereby, of the Borrower to
the Lender, and confirms its obligations under all documents securing the
Guaranty.

         IN WITNESS WHEREOF, the undersigned has caused its duly authorized
officer to execute this Consent and Confirmation as an instrument under Seal.

WITNESS:                                    THE CELLULAR HOTLINE, INC.

/s/ Sharon E. Marone                        By: /s/ Ismael Pinho
--------------------                            ----------------------
                                                Name: Ismael Pinho
                                                Its: CFO

                                       5
<PAGE>   6
                  [NOTARIZATIONS FOR SIGNATURES ON PRIOR PAGE]

STATE OF CONNECTICUT                )
                                    )  ss. Wethersfield
COUNTY OF HARTFORD                  )

         In Wethersfield on the 2nd day of May, 2001, before me personally
appeared the above-named Ismael Pinho, CFO of SHARED TECHNOLOGIES CELLULAR, INC.
to me known and known by me to be the party executing the foregoing instrument
on behalf of said corporation and acknowledged said instrument so executed to be
his free act and deed in said capacity and the free act and deed of said
corporation.

                                         /s/ Nancy J. Morrin
                                         -------------------
                                         Notary Public
                                         My Commission Expires: Aug. 31, 2004

STATE OF CONNECTICUT                )
                                    )  ss. Wethersfield
COUNTY OF HARTFORD                  )

         In Wethersfield on the 2nd day of May, 2001, before me personally
appeared the above-named Ismael Pinho, CFO of THE CELLULAR HOTLINE, INC. to me
known and known by me to be the party executing the foregoing instrument on
behalf of said corporation and acknowledged said instrument so executed to be
his free act and deed in said capacity and the free act and deed of said
corporation.

                                         /s/ Nancy J. Morrin
                                         -------------------
                                         Notary Public
                                         My Commission Expires: Aug. 31, 2004

                                       6
<PAGE>   7
STATE OF                            )
                                    )  ss.
COUNTY OF                           )

         At 15 Bolton Street, London, on the 4th day of May, 2001, before me
personally appeared the above-named Herbert L. Oakes, Jr., the President of
Oakes, Fitzwilliams & Co., Inc., Manager of Mobile Investments LLC to me known
and known by me to be the party executing the foregoing instrument on behalf of
said Lender and acknowledged said instrument so executed to be his free act and
deed in said capacity and the free act and deed of said Lender.

                                         /s/ Anthony Mao
                                         ---------------
                                         Notary Public
                                         My Commission Expires:
                                         Solicitor

                                       7

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