SIM swapping (also referred to as SIM jacking) is a form of phone hacking—and one that's especially dangerous. In this type of attack, threat actors reroute your cell number to another SIM card on a different phone, meaning all of your calls, texts, and two-factor authentication codes are visible to someone else.(This is one of several reasons why you should avoid SMS authentication whenever possible.)
Wireless Account Lock prevents certain changes from being made on your AT&T account while the setting is active, meaning no one (not even an AT&T employee) can transfer your number to a new SIM card. When enabled, Wireless Account Lock prevents the following:
Changing a SIM card or eSIM
Adding a new line
Changing authorized users
If you have a business account, the account administrator can choose to exempt lines or select specific lock functions to turn on or off.
How to enable AT&T Wireless Account Lock
Mobile Security > Wireless Account Lock. Select Continue, choose the account you want to lock or unlock, and swipe to complete. AT&T Prepaid customers can choose the number they want to lock from the myAT&T app, select Continue, then go to Profile & Settings > Account Info & Preferences > Wireless Account Lock > Turn on or Turn off. You'll need to validate the change with an SMS code.
Note that both T-Mobile and Verizon already offer security features—called SIM Protection—to prevent SIM swapping attacks to both prepaid and postpaid customers. If you use either of these carriers, you can enable this feature on your line via the appropriate website or app.
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