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 ...

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

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 ...