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.

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.

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.

When you call, ask the customer service person to “network unlock” the phone for you. Here are some numbers and websites to get you started. Read the full policies for details: ...

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.

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.