Protect yourself against SIM swapping and more security threats by setting up a SIM PIN right now.

(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 ...

After you purchase and use your cellphone for an extended period of time, you can change networks. However, the phone that you're currently using may not be offered on that network. If you wish to ...

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 ...

The wireless carrier has been selling phones unlocked, allowing you to swap SIM cards and use other carriers. Soon, it'll lock phones for a certain period. Roger Cheng Former Executive Editor / Head ...