FACT SHEET What is TRW PhonePrintTM ? TRW PhonePrintTM is a system designed to block illegal access to cellular networks by cellular "counterfeiters" who use stolen telephone identification numbers. How Does It Work? Each cellular telephone emits unique signal transmission characteristics - an electronic version of a human fingerprint - which cannot be duplicated. These characteristics are matched with the mobile identification number (MIN) and the electronic serial number (ENS) of the phone to develop a unique pattern for each legitimate customer, TRW PhonePrintTM uses sophisticated signal analysis hardware and software to analyze and file the patterns belonging to legitimate customers. When a caller attempts to access the network, the system compares incoming patterns to those on file. If the patterns do not match the call is immediately terminated. Who Benefits? Cellular telephone fraud costs the industry up to $300 million annually. TRW PhonePrintTM benefits cellular operators and customers by: o Terminating fraudulent calls before they can access the system o Eliminating the need for legitimate users to change phone numbers or codes. o Increasing the capacity of the network by eliminating the flow of illegal traffic. o Building customer confidence in the security of the cellular network. When Will It Be Available? TRW PhonePrintTM is currently being tested by PacTel Cellular, Los Angeles. Testing is expected to be completed in early 1994, and the system will be made available to cellular carriers nationwide. The Company TRW, headquartered in Cleveland, Ohio, is strategically focused on providing products and services with a high technology or engineering content.