(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...

Here, the user has to perform the SIM Lock procedure only once and there after, everytime phone is rebooted, SIM gets unlocked automatically without the need for the user remember the passcode.

GSM phones can be "locked", that is made to accept only SIM cards belonging to a specific network. Typically, this is done so that phones will work only on the network of the carrier. SIM-locked ...