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Lock SIM card with PIN code

For security, you can require a PIN code in order to use your SIM card in any device. This PIN code follows the SIM card from one device to another.


Learn how to lock your SIM card

To learn how to enable SIM lock, visit Device Support and download the User Manual for your device. 

Enter SIM Lock PIN code

When enabling SIM lock, your device prompts you to enter a PIN code:
  • The default PIN code for an AT&T SIM card is 1111.
  • Change the default PIN code for more security.
  • After activating SIM lock, you must enter the PIN code if you move the SIM card to another device.
  • If you forget your SIM lock PIN code, learn how to get the PIN Unlock Key (PUK) code to unlock your SIM card.

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