[API LOGO]
 
                               February 18, 1998
 
Dear Shareholders:
 
    I am pleased to inform you that on February 11, 1998, the Company entered
into an Agreement and Plan of Merger with Telephone and Data Systems, Inc.
("TDS") and API Merger Corp. ("API Merger"), a direct wholly-owned subsidiary of
TDS, pursuant to which API Merger is commencing a cash tender offer (the
"Offer") to purchase all outstanding Common Shares of the Company it does not
already own at $2.50 net per share. The Offer is conditioned upon, among other
things, satisfaction of the conditions that (1) there be validly tendered and
not withdrawn at least the number of shares that when added to the shares owned
by TDS and API Merger shall constitute 90% of the outstanding Common Shares of
the Company and (2) the Asset Contribution Agreement with TSR Paging shall be in
full force and effect and not terminated in accordance with its terms and
certain closing conditions contained therein shall have been satisfied or
waived. Following the completion of the Offer, upon the terms and subject to the
conditions of the Merger Agreement, API Merger will be merged into the Company
(the "Merger"), and each Common Share of the Company not purchased in the Offer
(other than those shares held in the Company's treasury or owned by TDS, its
affiliates, or by any dissenting shareholders) will be converted into the right
to receive $2.50 net per share in cash, without interest. Upon consummation of
these transactions, TDS will own the entire equity interest in the Company.
 
    THE BOARD OF DIRECTORS, BASED IN PART ON THE UNANIMOUS RECOMMENDATION OF THE
SPECIAL COMMITTEE (COMPRISED OF DIRECTORS WHO ARE NOT OFFICERS OR EMPLOYEES OF
THE COMPANY NOR OFFICERS OR DIRECTORS OF TDS OR ITS AFFILIATES), HAS UNANIMOUSLY
APPROVED THE MERGER AGREEMENT, DETERMINED THAT EACH OF THE OFFER AND MERGER IS
FAIR TO THE COMPANY'S PUBLIC SHAREHOLDERS AND RECOMMENDS THAT SHAREHOLDERS
ACCEPT THE OFFER AND TENDER THEIR SHARES PURSUANT TO THE OFFER.
 
    In arriving at their decisions, the Special Committee and the Board of
Directors gave careful consideration to a number of factors described in the
attached Schedule 14D-9 that is being filed today with the Securities and
Exchange Commission. Among other things, the Special Committee and the Board of
Directors considered the opinion of PaineWebber, the financial advisor to the
Special Committee, that the consideration to be offered to the public
shareholders of the Company in the Offer and the Merger is fair, from a
financial point of view, to the holders of Common Shares (other than TDS and its
affiliates).
 
    Accompanying this letter, in addition to the attached Schedule 14D-9
relating to the Offer, is the Offer to Purchase, dated February 18, 1998, of API
Merger, together with related materials including a Letter of Transmittal to be
used for tendering your shares. These documents set forth the terms and
conditions of the Offer and the Merger, provide detailed information about these
transactions and include instructions as to how to tender your shares. I urge
you to read the enclosed materials carefully.
 
                                          Very truly yours,
 
                                                      [SIGNATURE]
 
                                          Terrence T. Sullivan
                                          President