How to lock your SIM on Android

Your phone's SIM card allows the device to make calls, send texts, and connect to the internet. The SIM card provides a phone ...
ZDNet

Lock down your AT&T account to prevent SIM swapping attacks - here's how

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 ...