Mobile telephone using subscriber card

摘要

Private data in an EEPROM ( 14 ) is erased in a data erasing procedure when pulling out an SIM card ( 2 ) from a mobile telephone ( 1 ). Before being erased, the private data is encrypted in an encryption procedure and it is transferred and recorded to an external memory ( 3 ). The private data encrypted and recorded to the external memory can be reused when the SIM card is used in another mobile telephone. Furthermore, it is possible to prevent the external memory from being left behind when the SIM card is pulled out by interfacing a lock mechanism of a card mounting section ( 16 ) with that of a memory mounting section ( 17 ).