Buy or change SIM cards

The SIM card is your device's ticket to the T-Mobile network!

 

 

About SIM cards

  • Your SIM card is linked to your phone number, and it connects you to T-Mobile. It's not a memory card or SD card.
  • Your SIM card can be easily moved from your current phone into another compatible phone to transfer your service.
  • Check your device to find out the SIM size (See the "Tech specs" page), how to insert it, and how to set up SIM security.
  • T-Mobile devices support three SIM sizes. If your device needs a different size, see Buy a SIM card.

    • Nano SIM: The smallest SIM, most likely to be found in new devices.
    • Micro SIM: A medium SIM, normally used in previous model devices.
    • Standard SIM: The largest SIM, aka Mini SIM, found in older devices.
    • The T-Mobile SIM Starter Kit comes with adapters to work in devices that require nano, micro, and standard SIMs.
      SIM Card.jpg
  • Limited devices on our network support eSIMs using the T-Mobile eSIM app.
  • We strongly suggest that you  Set up your Customer PIN/Passcode to protect your account and SIM.

 

 

Buy a SIM card

T-Mobile SIM Starter Kits come with adapters, in case your device uses a nano, micro, or standard card.

 

 

 

Change or activate a SIM card

If you're using a device from another wireless provider, you will first need to contact the previous provider and request a SIM unlock.

 

To activate an unused T-Mobile SIM on a new or existing phone number:

 

 

 

SIM card and PUK errors

 

'PUK Lock' or 'SIM Lock' errors

If a SIM PIN security code has been entered incorrectly multiple times, the SIM will lock and require you to enter a PUK code to use your device again.

 

  • Be careful!
    • If you incorrectly enter your PUK code 10 times, your SIM will need to be replaced.
    • Moving your SIM to another device will not fix this error.
  • The PUK is unique to your SIM card. To get the code, you need to either:
    • Contact us online or with another phone. For your security, you must be the account holder or have them available to verify.
    • Use the PUK Code printed on the card your SIM came in. Make sure the SIM card number matches the card.
  • Once you have the PUK code, follow the instructions for your Device to enter it.
Other SIM errors
  • "Contact your service provider'
  • 'Insert SIM' or 'Invalid SIM'
  • 'Unregistered SIM'

 

If you receive any of these errors:

 

  1. If using a non-T-Mobile device, make sure it is SIM unlocked. Contact the original provider if you need help.
  2. Turn off the device.
  3. Remove the SIM card from the device. For steps on how, visit the Devices page.
  4. Re-insert the SIM card snugly in the SIM slot.
  5. Turn on the device.
  6. If you're able to register on our network, the error should no longer appear.
  7. Perform a manual network selection, and try to register on the T-Mobile network.
  8. If available, move the SIM card to another T-Mobile device and test if it works or not. This test will help Customer Care diagnose the problem.
  9. If the error continues, use another device or online option to contact us.