Your phone's SIM card allows the device to make calls, send texts, and connect to the internet. The SIM card provides a phone number that identifies your device on the carrier's network, whether it's ...

Primary and secondary account holders can now block specific transactions and account changes across all devices and lines on their account. AT&T is adding an extra layer of protection to prevent ...

Criminals are increasingly using a technique called “SIM swapping” to steal personal information and gain access to your accounts via your phone. SIM swapping is a crime where criminals steal your ...

The carrier’s new Account Lock feature will prevent unauthorized changes to your account, including phone number and SIM card transfers. The carrier’s new Account Lock feature will prevent ...

The newer eSIM technology, which is quickly becoming the standard on high-end phones, is safer and more convenient.

Phone suddenly showing "No SIM" or "Invalid SIM"? Don't panic, there are a few quick checks that can get you reconnected fast.

AT&T is rolling out a protection that prevents unauthorized changes to mobile accounts as the carrier attempts to fight a costly form of account hijacking that occurs when a scammer swaps out the SIM ...