To unlock your iPhone from its carrier, you'll likely need to contact your carrier directly to cancel your contract.

You can check to see if your iPhone is unlocked from a carrier using any of a few different methods.

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

If you’ve bought a cellular iPad from someone other than Apple, you may later find that the iPad is locked to a particular network. If you insert a SIM from a ...

The new Samsung Galaxy Note 5 requires a nano SIM card for you to place calls, access the Internet, download applications, and share photos over your network service ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...