If you're an AT&T customer, you can unlock your phone using a portal on the AT&T website. You'll need to have paid all of ...

When you unlock a phone, it means that you alone own the device and can use it with any cell phone carrier.

You should use a strong Lock Screen passcode to ensure thieves can't observe you entering your PIN and then stealing your iPhone. And we've shown you how to set up a stronger iPhone Lock Screen ...