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 ...

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 ...

If you have a SIM card PIN enabled on your phone to access data on the SIM card, but you repeatedly enter it incorrectly, the SIM card may lock you out from further attempts. You can reset the SIM ...

(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 ...

Sprint today clarified its policy on carrier-locking the SIM card slot on its iPhone 4S. Sprint's policy will be to lock the SIM card slot out of the box, so it will only work with a Sprint SIM card ...

Google’s system basically keeps all the security of a SIM PIN, while removing all the inconvenience. Just make sure you jot down the Android-managed PIN somewhere secure, in case your phone ever dies ...

Update, October 19, 2018 (12:20PM EST): It’s not clear whether it’s from customer backlash or if it was always planned this way, but Verizon is apparently remotely SIM-unlocking all Google Pixel 3 ...