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

At some point in time, you may need to know your iPhone’s serial number and SIM number. And if you don’t have your own phone number memorized, well, it goes without saying that you’ll need ...

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