New lock feature for the mobile phones with SIM card to prevent working with it when it was stolen and was switched on.
Original Publication Date: 2002-Nov-21
Included in the Prior Art Database: 2002-Nov-21
Many mobile phones in the market (like GSM phones) use SIM (Subscriber Identity Module) card to store user identity information. These cards, has a special password called PIN (Personal Identity Number) that is used for security authentication during power on. This feature can be switched off. When unauthenticated person, switch on mobile with PIN enabled verification, it will be prompted to input PIN number (usually 4 digits code). Without this input, user can initiate emergency call only, all other calls and features are disabled until successful PIN verification. After 3 unsuccessful PIN verifications SIM is blocked, and can’t be used. This mechanism used to protect stolen equipment from unauthenticated access and sometimes it is called as CHV – Card Holder Verification.