It's important to know how to lock your SIM card to keep your data safe. Whether you have the latest 5G phone or a budget Android phone, turning on SIM lock is straightforward. This guide walks ...

(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 ...

This will generally trigger a message saying something like ‘SIM Not Supported.’ For more information, we have a separate article explaining how to tell if your iPhone is locked. Before you ...