The company may send you an unlock code or ask you to unlock your phone via a T-Mobile app. You can also have your phone unlocked by calling 611 from your T-Mobile phone or 800-937-8997.

Learn how to check if your phone is unlocked and, if it isn't, how you go about making an unlock request with AT&T, Sprint, T-Mobile and Verizon.

If the unlock has gone through, remove your AT&T SIM card and insert the SIM for your new carrier to begin the setup process. Don’t worry about iPads and wearable devices with LTE connections.

iPads bought on a network contract may be SIM-locked to that network. Here's how to unlock the iPad - and advice on whether it's legal for you to do so.

If you want to find out how to unlock your iPhone so you can use it with another network read: How to unlock an iPhone. How to check if an iPhone is unlocked in Settings. Screenshot.

Unlock your Samsung phone to use on other networks. Skip to main content. ... The easiest way to check is to put in a SIM card from another network and see if you get a signal.