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Swap active SIM cards between devices

Find out how to switch an active SIM card to another device.

What's a SIM card?
A SIM card is a microchip that inserts into a compatible mobile device. It identifies and connects you to the AT&T wireless network.

Fix SIM card issues

Learn how to troubleshoot SIM error messages, move contacts between SIM cards or devices, and activate a new SIM card.

Fix it now

What to know before switching SIM cards

Make sure the SIM cards for both devices are the same size.

Heads up:

Swap out active SIM cards

  1. Turn your device off.
  2. Remove the old SIM card.
  3. Insert the new one.
  4. Turn your device on.

Want help inserting your SIM card? Go to our device tutorials and choose the option for your device.

If you have AT&T PREPAID

Follow these steps before you turn off your device.
  1. Go to
  2. Select My Device and then Update Device. Don't know your IMEI for this step?
    Enter *#06# on your phone's keypad to get it.
  3. Enter the SIM card number and then select Continue.

Need help finding your SIM card number? Check out this SIM card image

Get help with SIM card swap issues

iPhone doesn’t show AT&T in the status bar
  1. Connect your device to iTunes®. Still not working?
  2. Go to
  3. Enter the requested info and follow the prompts to update your account with your new SIM card and IMEI number.

Data services don’t work after swapping SIM card
  • If you're swapping a SIM card from a basic phone to a smartphone or tablet, we’ll add a compatible data plan when the device activates on our network. Or, call us to add it.
  • Can’t use data after swapping the SIM and confirming or adding a data plan? You may have to program the correct APN and MMS data settings.
Last updated: April 7, 2021

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