How to Unlock the PUK Code on a Mobile Phone If Locked?. GSM phones give you the option to set a PIN code on the SIM card as a security measure. If you only set a phone lock and you lose your ...

SIM locking is popular in most of the world, but the US has never caught on. Setting up SIM lock offers an essential layer of protection.

What does SIM lock actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.