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.

How to Use Your Unlock Code Once you have acquired your SIM unlock code, follow these steps: Turn off your phone and insert the new SIM card.

How Does Unlocking SIM Cards Work?. After you purchase and use your cellphone for an extended period of time, you can change networks.

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

On Tuesday, AT&T revealed Wireless Account Lock, a new protection designed to curb the SIM-swap scams. When activated, the lock prevents changes from being made to a SIM until it's turned off again.