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

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.

Available starting today, Wireless Account Lock is an option for AT&T subscribers with postpaid or prepaid wireless accounts. Simply by turning on a switch in the myAT&T app, you can enable Account Lock to prevent unauthorized changes to your account and phone lines.