| 摘要 |
PROBLEM TO BE SOLVED: To track a thief who stole a portable radio communication equipment without allowing him to suspect of pursuit by providing at least both of a normal telephone number and a telephone number for the counter measure against theft so as to call by the telephone number for counter measure to theft to connect lines without giving normal calling information, etc. SOLUTION: A memory 7 previously stores at least two telephone numbers for its own equipment to use one for the normal telephone number and the other for the measure to theft. At the time of receiving this telephone number of the measure of theft, a control part 4 does not execute neither calling information nor display differently from at a normal receiving time, but starts a transmission part 12, executes automatic call incoming response, establishes a speech channel can connects calls. Then the part 4 transmits surrounding voice inputted from a microphone 10 to the transmission part 12 to a base station. Namely peripheral voice is continued to be transmitted while allowing a person carrying the telephone set at present not to notice reception and transmission.
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