Band selection of a method for dual-band - the mobile telephone and the mobile telephone for the application of the process

摘要

PROBLEM TO BE SOLVED: To automatically select one system without sharp cost increase, in the case that the portable telephone set has both functions of a personal handy phone system PHS and a communication global system for mobile communication GSM. ;SOLUTION: A common control circuit 4 retrieves whether or not a subscriber identification module SIM card 19 is mounted on a card mount section 9 by a SIM card retrieval means 21, and when the mount is detected and storage data are normally read from the SIM card 19, a GSM is displayed by a mode lamp 17, and communication is conducted by the operation in the GSM mode. When the mount detection of the SIM card 19 is disabled or data cannot be read from the SIM card 19, a mode setting means 23 sets a PHS mode in place of the GSM mode and the PHS mode is displayed by the mode lamp 17, and the communication is conducted by the operation in the PHS mode. A mode set to the operation is stored in a mode memory 13, and the operation of the system is started in the mode to be stored at application of power.;COPYRIGHT: (C)2000,JPO