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.

Have you ever wondered exactly how a SIM card works? We'll help you understand why your phone needs one and what they do to keep you connected.

To check if your Android phone is unlocked, try swapping in another SIM card or test your network settings. If calls work, ...

If your phone suddenly won't recognize your SIM card, don't panic. There are a few things you can do to try and resolve the problem. Here's what to do.