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

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

Many people don’t realize if they buy their phone from their phone company, it will be locked to prevent it from working on the networks of any other carrier. (Jim Rossman/TNS)(Jim Rossman / TNS ...

If you need to know whether or not your phone is carrier unlocked, follow these steps to find the answer.

When that happens, you might see the "your phone is not registered on a network" on your screen, which means your SIM card can't connect to your wireless provider's network.