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One or more of your devices has lost service

Install a FREE T-Mobile SIM to continue calling, texting & streaming! No changes to your phone number, plan, price, or data.

Got Questions?

If you received a T-Mobile SIM in the packaging shown below, please follow the enclosed instructions or visit to activate.

If you need additional support, visit a T-Mobile store, chat with us online, or call us at 888-211-4727 (or dial *2). We’ll help you through the process.

If you don’t have a T-Mobile SIM, you can order a free SIM.

I received a T-Mobile SIM with my phone order. What do I do?

Please contact us before inserting the T-Mobile SIM or carefully follow the instructions on If you’re upgrading your device you can go to and follow the Device Swap flow.

  • If you added a new line, go to and follow the SIM Swap flow.
  • If you need assistance, please visit a T-Mobile store, chat with us online, or call us at 888-211-4727 (or dial *2) to help you through the process.

Follow these steps to prepare your device(s) and voicemail.

  1. Update your software/firmware.
  2. Back up your device. 
  3. If you have a smartwatch (Apple Watch, Galaxy Watch etc.) then have it with you so it can be paired with your phone.
  4. Carefully follow the instructions on

We can also help you through these steps if you visit a T-Mobile Store, or chat with us online, or call us at 888-211-4727 (or dial *2).

Get Help When You Need It

We have dedicated Customer Care ready to help you swap your SIM card and stay connected.

T-Mobile for Business customer? Call 800-927-2199