If you can no longer make calls, text, or use the data connection on your T-Mobile phone, it could be that the entire network is down. On the other hand, it could also be a random issue with your phone or T-Mobile account.

There are signs that can point you to a solution. This article explains:

If you think T-Mobile is down for everyone, try these steps:

Check the T-Mobile Issues page at Downdetector.com. This page will not only show you if there is a current issue, but also recent issues, a live outage map, and the most commonly reported types of issues that are occurring. Another quick place to check is the T-mobile.com Status page at downforeveryoneorjustme.com.