| 摘要 |
PURPOSE:To obtain a telephone system whose user call telephone number is unchanged even if the user replaces a radio telephone set by providing a radio telephone set accommodating a ROM cartridge with an identification number increase of outgoing call and incoming call written therein a replaceable way. CONSTITUTION:An IDROM cartridge 1 accommodates a ROM in which a telephone number in case of outgoing call/incoming call is written, and in case of plug-in of the cartridge 1 to the main body 2, the ROM is connected to a decoder of the main body 2. The memory for the automatic dial function and the scratch pad function is stored in the cartridge 1. Moreover, a personal identification number is given to the user to prevent unauthorized use. By such a constitution, even when the ratio telephone set in use is replaced, the user call telephone number is unchanged and many users share one telephone set, the telephone charge can be calculated on individual basis. |
