[Letterhead of TDS] April 15, 1996 American Paging, Inc. Suite 3100 1300 Godward Street, N.E. Minneapolis, Minnesota 55413 Re: Revolving Credit Agreement dated January 1, 1994, as last amended December 31, 1995 (the "Revolving Credit Agreement"), between American Paging, Inc. (the "Company") and Telephone and Data Systems, Inc. ("TDS") ---------------------------------------------------------------------- Gentlemen: This letter will constitute TDS's agreement to correct the Revolving Credit Agreement by amending and restating Section 7(b)(2) thereof in its entirety to read as follows: "(2) the Company shall not permit its consolidated equity to be less than 30% of its consolidated liabilities (including, without limitation, the Note, accounts payable and other liabilities, but excluding customer deposits and unearned revenues);" All other terms and conditions of the Revolving Credit Agreement shall remain in full force and effect. Please acknowledge your agreement to this amendment by executing a copy of this letter and return it to the undersigned. Very truly yours, TELEPHONE AND DATA SYSTEMS, INC. By: /s/ Ronald D. Webster -------------------------------------- Ronald D. Webster Vice President and Treasurer American Paging, Inc. April 15, 1996 Page 2 Accepted and agreed to as of the date set forth above. AMERICAN PAGING, INC. By: /s/ Terrence T. Sullivan -------------------------------------- Terrence T. Sullivan Vice President - Finance (Chief Financial Officer) and Treasurer