Mobile communications networks, systems and apparatus, namely, digital mobile telephones, base transceiver station, base station controller and mobile switching center; wireless telecommunication switches; GSM(Global System for Mobile communications) radio access systems, namely, transmitters, receivers, repeaters, multiplexers, wireless and controllers, all for operation in the radio spectrum of either 900 or 1800 MHZ; computers, microprocessors, computer programs and programmable, read-only...