Primary and secondary account holders can now block specific transactions and account changes across all devices and lines on their account.

On Tuesday, AT&T revealed Wireless Account Lock, a new protection designed to curb the SIM-swap scams. When activated, the lock prevents changes from being made to a SIM until it's turned off again. The on/off button for Wireless Account Lock is available in the settings of the myAT&T mobile app.

If you're an AT&T customer, you can turn on a new security feature that prevents your phone number from being moved to a different device without your knowledge, exposing your data to cyber criminals in the process.