This will generally trigger a message saying something like ‘SIM Not Supported.’ For more information, we have a separate article explaining how to tell if your iPhone is locked. Before you ...

Apple's iPhone brought the SIM lock into public view because of its original exclusivity in the U.S. with AT&T. However, iPhones were readily "unlocked" by hackers both in and outside the U.S ...

When the SIM is transferred to a different phone, whether an iPhone or Android, you can't use it until it's unlocked. Here's what you see when you insert your locked SIM into another iPhone or ...