Patent ID: 7945243

Claim:
A mobile equipment (ME) apparatus for use in a Global System for Mobile communication (GSM) system, comprising: a Subscriber Identity Module (SIM) card for storing International Mobile Subscriber Identity (IMSI) information used for subscriber authentication and private contents; and a Mobile Terminal (MT) for storing the IMSI and private contents of a primary user, the MT including a controller for reading IMSI information from the SIM card when the SIM card is inserted into the MT and when an attempt is made to access private contents, denying access to the stored private contents of the primary user when the read IMSI information of the inserted SIM card is different from the stored IMSI information and permitting access to the private contents stored in the SIM card, wherein if the IMSI information of the inserted SIM card is different from the IMSI information stored in the MT and an attempt is made to store private contents in the MT, the controller stores the private contents in the SIM card.