RADIO TELEPHONY EQUIPMENT HAVING KEYBOARD

摘要

PROBLEM TO BE SOLVED: To provide a radio telephony equipment such as a system whose illegal use is prevented even when the user leaves the system unblocked. SOLUTION: In order to prevent unauthorized use of the system such as an unauthenticated call, the control of the system, especially its keyboard 9 is brought into a blocking state after some inoperative period. In order to make the system available, a block release code is to be entered. However, an incoming call and an emergency call are proposed to be authenticated. This invention is applied to a portable radio telephony equipment.