EXHIBIT 10.1

                                     (logo) CHASE

THE CHASE MANHATTAN BANK                                   CAROLYN B. LATTANZI
395 North Service Road, Suite 302                          Vice President
Melville, NY  11747-3142                                   Nassau Middle Market
Tel 516-755-5163
Fax 516-755-0152







September 29, 1997

Mr. Stephen Katz
Chairman of the Board/Chief Executive Officer
CELLULAR TECHNICAL SERVICES COMPANY, INC.
2401 Fourth Avenue
Seattle, Washington  98121

Dear Steve,

We are pleased to advise you that based upon your annual financial statements 
for the fiscal year ending December 31, 1996, The Chase Manhattan Bank (the 
"Bank") has approved your request for a secured line of credit for Cellular 
Technical Services Company, Inc., in the aggregate amount of $5,000,000.  The 
line of credit will be secured by a first priority perfected security 
interest in all personal property of Cellular Technical Services Company, 
Inc.  Our officers may, at their discretion, make short-term loans to 
Cellular Technical Services Company, Inc., on such terms as are mutually 
agreed upon between us from time to time.

Borrowings under this line of credit are intended to be used to meet your 
normal short-term working capital needs and will bear interest at 3/4% over 
our prime rate. This line of credit has an associated administration fee of 
$4,000, payable in advance.

It is a condition that all outstandings under the line be repaid for a 
consecutive 30 day period before the expiration date of this line.

As this line is not a commitment, credit availability is, in addition, 
subject to your execution and delivery of such documentation as the Bank 
deems appropriate and the receipt and continuing satisfaction with current 
financial information, which information will be furnished to the Bank as it 
may from time to time reasonably request.  This line of credit expires on 
June 30, 1998.

We are pleased to be of service and trust you will call upon us to assist in
any of your banking requirements.


Very truly yours,

/s/ Carolyn B. Lattanzi