Document:

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                                                                     EXHIBIT 4.7

                       SHARED TECHNOLOGIES CELLULAR, INC.
                        100 GREAT MEADOW ROAD, SUITE 104
                             WETHERSFIELD, CT 06109

                                          March 14, 2001

Mobile Investments LLC
960 Main Street
Hartford, CT 06103

RE:      ISSUANCE OF WARRANT FOR 3,000,000 SHARES OF SHARED TECHNOLOGIES COMMON
         STOCK

Gentlemen:

         Shared Technologies Cellular, Inc. (the "Company") and the board of
directors of the Company hereby agree, subject to obtaining shareholder approval
described below, to issue to Mobile Investments LLC ("Mobile Investments") its
Common Stock Purchase Warrant (the "Warrant") with respect to 3,000,000
additional shares of the Company's common stock. The Company shall convene a
meeting of its shareholders within 120 days of the date hereof and shall use its
best efforts to seek such shareholder approval to (i) authorize sufficient
shares of common stock of the Company, and (ii) take such other necessary
corporate action to allow the issuance of the Warrant. The board of directors of
the Company has already approved such measures, and each of the directors of the
Company hereby pledges to vote his or her shares of the Company, and any shares
of the Company under such director's beneficial control, in favor of such
measures in connection with such shareholder approval. Following such
shareholder approval, the Company will promptly issue the Warrant to Mobile
Investments. The Warrant shall be substantially in the form of the Common Stock
Purchase Warrant No. M-2 for 2,000,000 shares issued by the Company to Mobile
Investments on March 14, 2001 (the "Common Stock Warrant") and shall have the
same Exercise Period as defined in the Common Stock Warrant. Mobile Investments
acknowledges that without such shareholder approval, the Company will be unable
to issue the Warrant. If the Company cannot obtain the necessary shareholder
approval described herein within six months of the date hereof, then the Company
will (A) continue to use its best efforts to seek such shareholder approval
until such time as such shareholder approval has been obtained, and (B) issue a
similar warrant or warrants to Mobile Investments for an equivalent amount of
the preferred stock of the Company (i) having the same rights and privileges as
the common stock of the Company, (ii) to be redeemed within three years of the
date of issuance, (iii) to provide for the holder to receive a return on the
redemption of such warrant equal to the return that would be received if the
warrant was for common stock of the Company at the time of the redemption, (iv)
that will participate with the common stock of the
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Company (a) in any dividends issued by the Company and (b) upon the liquidation
of the Company, each on equal terms with the common stock, and (v) on such other
terms and conditions mutually acceptable to the Company and Mobile Investments.

         Please acknowledge your agreement to the terms and conditions of this
letter by signing this letter in the space provided below. This letter may be
executed in any number of counterparts, all of which taken together shall
constitute one and the same instrument and any of the parties hereto may execute
this letter by signing any such counterpart.

                                              Very truly yours,

                                              SHARED TECHNOLOGIES CELLULAR, INC.

                                              By:  /s/ Anthony D. Autorino
                                                   Name: Anthony D. Autorino
                                                   Title: Chairman

/s/ Anthony D. Autorino                            /s/ Thomas H. Decker
Anthony D. Autorino                                    Thomas H. Decker

/s/ William A. DiBella                             /s/ Ajit G. Hutheesing
William A. DiBella                                     Ajit G. Hutheesing

/s/ Victor Grillo, Sr.                             /s/ Nicholas E. Sinacori
Victor Grillo, Sr.                                     Nicholas E. Sinacori

Accepted and Agreed:

MOBILE INVESTMENTS LLC

By: Oakes Fitzwilliams Executive Death Benefit
    & Retirement Scheme (No.2) (HLO), its member

By: /s/  Herbert Oakes, Jr
    Name:  Herbert L. Oakes, Jr.
    Title:  Trustee

Date: March 14, 2001

                                      -2-<PAGE>   1
                                                                     EXHIBIT 4.8

                       SHARED TECHNOLOGIES CELLULAR, INC.
                        100 GREAT MEADOW ROAD, SUITE 104
                             WETHERSFIELD, CT 06109

                                            March 14, 2001

Mobile Investments LLC
960 Main Street
Hartford, CT  06103

         RE:      ADJUSTMENT OF SHARES TO MOBILE INVESTMENTS

Gentlemen:

         On the date hereof, Shared Technologies Cellular, Inc. (the "Company")
has (i) issued to Mobile Investments LLC ("Mobile") Warrant No.: M-1 and Warrant
No.: M-2 representing 7,000,000, in the aggregate, of the Company's common stock
(each, a "Warrant" and collectively, the "Warrants"), and (ii) delivered to
Mobile a letter agreement (the "Agreement") entitled "Issuance of Warrants for
3,000,000 Shares of Shared Technologies Common Stock" of even date herewith by
and between the Company and Mobile. Notwithstanding anything in the Warrants or
the Agreement to the contrary, the Company and Mobile agree that the number of
shares vested in each Warrant and the Agreement, respectively, at any given time
shall be equal to (i) the number of shares stated in each Warrant or the
Agreement, respectively, multiplied by, (ii) the fraction, the numerator of
which shall be the total amount of funds loaned by Mobile to the Company and the
denominator of which will be $5,000,000. Mobile will not be entitled to any
increase in the number of shares reflected in each Warrant for any funds loaned
by it to the Company in excess of $5,000,000. Monies received by Mobile as
repayment of its loan to the Company shall not operate to reduce any vested
shares reflected in the Warrants or the Agreement. If the total amount of funds
loaned by Mobile to the Company exceeds $5,000,000, then the number of shares
reflected in the Agreement shall be increased to reflect the difference between
(i) the amount calculated in accordance with the formula above and (ii)
7,000,000, and the Company will amend the Agreement, at the Company's sole cost
and expense, to reflect such new amount.

         The Company further agrees that if the vesting conditions contained in
the paragraph labeled "Warrants" set forth in that certain letter from Mobile to
the Company dated March 14, 2001 do not occur on or prior to March 30, 2001 (or
such other date as may be agreed to by the Company and Mobile), the Company will
amend, to the extent necessary, each of the Warrants and the Agreement, at the
Company's sole cost and expense, to reflect the actual number of shares
represented in each such Warrant and the Agreement which have vested in
accordance with the terms hereof.
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Mobile Investments LLC
March 14, 2001
Page 2

         Please acknowledge your agreement to the terms and conditions of this
letter by signing in the space provided below. This letter may be executed in
any number of counterparts, all of which taken together shall constitute one in
the same instrument and any of the parties hereto may execute this letter by
signing any such counterpart.

                                          Very truly yours,

                                          SHARED TECHNOLOGIES CELLULAR, INC.

                                          By:  /s/ Ismael Pinho
                                             -----------------------
                                               Name: Ismael Pinho
                                               Title: CFO
Accepted and Agreed:

MOBILE INVESTMENTS LLC

By: Oakes Fitzwilliams Executive Death
    Benefit & Retirement Scheme (No.2)
    (HLO), its Member

By:  /s/ Herbert L. Oakes, Jr.
     -------------------------
     Herbert L. Oakes, Jr.
     Trustee

     Dated: March 14, 2001<PAGE>   1
                                                                     EXHIBIT 4.9

                                AMENDMENT TO NOTE

         This is an Amendment dated as of May 2, 2001 amending a certain Amended
and Restated Revolving Credit Note Secured by Security Agreement and Other
Collateral (the "Note") in the original principal amount of Two Million Five
Hundred Thousand Dollars ($2,500,000.00) dated August 8, 2000, made by Shared
Technologies Cellular, Inc. ("Maker") payable to the order of Citizens Bank of
Massachusetts ("Citizens").

         Citizens has endorsed and conveyed said note to Anthony Autorino
("Autorino") as of March 1, 2001, and Autorino has endorsed and conveyed said
Note to Mobile Investments LLC ("Lender") as of March 1, 2001.

         In consideration of the Lender entering into the Seventh Amendment
Agreement and these premises and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Note is hereby
amended as follows:

         a)       The amount of the Note is hereby increased to Three Million
                  Seventy Eight Thousand Six Dollars and 96/100 ($3,078,006.96).
                  For value received, the Maker promises to pay to the order of
                  the Lender said amount, or such lesser amount advanced under
                  the Credit Agreement (hereafter defined).

         b)       Unless an Event of Default shall have occurred, no principal
                  or interest shall be payable until said maturity date.

         c)       The Note may be prepaid prior to said maturity date, but no
                  portion of the prepaid interest will be refunded.

         The Note as amended hereby is the Note referred to in and is entitled
to the benefits of, and subject to the terms of that certain Loan Agreement
dated July 7, 1999 among Maker and Lender, as amended by that certain First
Amendment Agreement dated as of December 3, 1999, that certain Second Amendment
Agreement dated May 1, 2000, that certain Third Amendment Agreement dated August
8, 2000 and that certain Fourth Amendment Agreement dated March 1, 2001, and
that certain Fifth Amendment Agreement dated March 30, 2001, that certain Sixth
Amendment Agreement dated April 20, 2001, and that certain Seventh Amendment
Agreement of even date herewith (said Credit Agreement and the previously
mentioned Amendments, as they may be further amended or modified from time to
time, are herein collectively referred to as the "Credit Agreement"). The Credit
Agreement is incorporated herein by reference.

         The Maker expressly acknowledges that:

         a)       This Agreement constitutes an amendment to the Note, which is
                  an amendment and restatement in its entirety of that certain
                  $10,000,000.00 Promissory Note dated July 7, 1999 payable by
                  the Maker to State Street Bank and Trust, as assigned to the
                  Lender, as previously amended and restated by that certain
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                  $5,000,000.00 Promissory Note dated May 1, 2000 payable to
                  Citizens Bank of Massachusetts ("Citizens") as modified by the
                  Third Amendment Agreement dated as of August 8, 2000 between
                  Maker and Citizens as assigned to the Lender (collectively the
                  "Original Note"); and

         b)       This Amendment is not a discharge or novation of the Original
                  Note; and

         c)       Notwithstanding the terms hereof, the Lender has expressly
                  reserved its rights against the Maker under the Original Note
                  as provided under Massachusetts Law and pursuant to judicial
                  precedent, both as in effect from time to time.

         This Agreement and all transactions hereunder and/or evidenced herein
shall be governed by, construed, and enforced in accordance with the substantive
laws of the State of Connecticut.

         IN WITNESS WHEREOF, the Maker has caused this Amendment to Note to be
executed as an instrument under seal by its duly authorized representative all
as of the date first above written.

WITNESS:                                 SHARED TECHNOLOGIES CELLULAR, INC.

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

                                     - 2 -

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