Cellular Technical Services and GTE Mobilnet Sign Letter of Intent To Deploy Blackbird Platform and PreTect Anti-Fraud System In Virginia Cellular Markets.

SEATTLE--(BUSINESS WIRE)--January 22, 1997--Cellular Technical Services Company, Inc. (Nasdaq/NM Symbol: CTSC) ("CTS"), a provider of real-time information management systems for the wireless communications industry, today announced that it has signed a letter of intent with GTE Mobilnet of Virginia under which CTS will provide its radio frequency (RF) "fingerprinting" technology - Blackbirdr Platform and PreTectT cellular fraud prevention system - for use in GTE's "B Band" cellular markets throughout Virginia.

The letter of intent calls for deployment of the CTS system in GTE's Virginia markets beginning in the first quarter of 1997 and includes participation in CTS's No Clone ZoneSM RF fingerprinting roaming fraud prevention service.

Bob Dahut, CTS President, said, "GTE's decision to deploy CTS's Blackbird Platform in their strategic Virginia markets further expands our presence in important Northeast corridor. With the GTE Virginia markets, CTS will provide comprehensive protection against cloning fraud from New England to the Mid Atlantic."

The CTS PreTect application uses patented signal processing, or radio frequency, "fingerprinting" technology to accurately distinguish between legitimate customers and counterfeit users on a pre-call basis. This system captures information from the cellular phone call at the cell site, before it enters the service provider's system, and compares it to validation data. PreTect can then automatically intercept and shut down a call if a proper match is not made. CTS's No Clone Zone service provides seamless real-time roaming fraud prevention between markets using the Blackbird Platform and PreTect application.

GTE Mobilnet is one of the largest cellular service providers in the United States. The company currently has approximately 3.7 million customers out of an industry wide total of approximately 38 million. The company is a wholly-owned subsidiary of GTE Corp. (NYSE: GTE). GTE is one of the largest publicly held telecommunications companies in the world. Within the United States, GTE has wireline and wireless operations that form a market area covering about one third of the country's population.

CTS develops, markets and supports real-time information management systems for the wireless communications industry. The company's integrated data management platforms and software applications enable wireless communications service providers to more rapidly and cost effectively grow their businesses.

CONTACT: Joseph D. Pititto

Director, Investor Relations 

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