Switching carriers or using a different SIM card on your iPhone doesn’t have to be complicated. If your device is SIM-locked, ...

Once the SIM card is locked, you will need to use a separate code called a PUK code to unlock it. Your carrier can provide you with the PUK code for your SIM card.

To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

What does USIM locked mean? This message simply means that your LG phone is currently network locked. How to fix a USIM-locked LG phone? Insert your sim card into the phone and turn your phone on.

If Network lock says ON, then your Samsung device is network locked. If Subset lock is ON, then your Samsung device has to be unlocked and requires a code from the original carrier.