An unlocked phone is the key to getting service from an alternative carrier. Here's how to check if a phone is unlocked.

It's not always easy to tell if an Android device is locked to a cellular/wireless provider, but there are methods to retrieve this information. If your device is locked, it will only take SIM cards ...

What does it mean if your iPhone is locked? If your iPhone is carrier-locked, it's only going to work with the cellular provider that locked it. However, if your iPhone isn't locked, you'll be able to ...