AT&T

AT&T has introduced a new security feature called Wireless Account Lock (also referred to as “Wireless Lock” or “Account Lock”) to protect customers from SIM swap attacks—a type of fraud where attackers transfer a victim’s phone number to a SIM card under their control to intercept calls, texts, and two-factor authentication codes. This feature is now available to all AT&T customers, including both individual and business accounts, after a phased rollout that began earlier in the year.