When you activate a new phone, the phone previously associated with the line is simultaneously deactivated. However, your phone records, text messages and contacts remain stored on the phone.

Oh, and here's our personal favorite: If you purchase your phone unlocked or you buy a phone from somewhere other than AT&T and activate it on your account, you still have to pay the $20 fee ...

AT&T's online activation site Using AT&T's online tool, first click "Activate your device." You'll be prompted for your wireless number and your billing or shipping ZIP code.

The iPhone X is now widely available across the United States, but some new iPhone X owners aren't able to start using their new phones due to carrier activation issues and congestion. On the ...

In preparation of a wide public launch expected before the end of the year, T-Mobile on Thursday previewed eSIM activation app for iPhone that will allow iPhone XS and XR owners to configure a ...