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

AT&T is launching a new Account Lock feature that’s designed to protect wireless users against SIM swapping attacks. The feature, which you can enable from the myAT&T app, prevents unauthorized changes to your account, like phone number transfers, SIM card changes, and updates to billing information.

AT&T today said that customers can activate Wireless Account Lock, a new feature that will prevent unauthorized changes to a wireless