Quick tip: If the phone is already unlocked, T-Mobile's site offers a guide for using the phone with other carriers. How to unlock an Android phone on T-Mobile The process will vary slightly ...

Each carrier has slightly different rules regarding how long you must own the phone and how long your account must be open.

T-Mobile, or the like has employed using software code to ensure a phone only connects to their network. This, of course, will be a problem if you decide to switch carriers and need to connect to ...

Check if you're prompted for an unlock code. Locked phones require a code provided by the service provider. 4. If not, try to make a call. If it connects, your phone doesn’t have a carrier lock ...

US telecom giants T-Mobile and AT&T opposed an FCC rule which would make it easier for consumers to unlock phones within 60 days of activation. The FCC is concerned about carrier-locked phones ...