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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 ...

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 ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...

SIM swapping is a popular type of fraud in which someone transfers your mobile number to a SIM in their own device. By intercepting any messages or phone calls sent to you, they're able to access your ...

AT&T today said that customers can activate Wireless Account Lock, a new feature that will prevent unauthorized changes to a wireless account. With Account Lock turned on, account changes like billing ...