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.

The 3G sim card slot is marked with a “W”, the 2G sim card slot is marked with a “G”. There are plans for newer dual- sim Android phones which have dual 3G compatible sim slots.

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

Are you switching phones or carriers? You'll need to learn how to remove a SIM card from your Android phone. Let's help you out!

These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.

Does your phone say "No SIM," "No SIM Card Installed,” or "No SIM available"? Here's what that means and how you can fix it.

If you are using a new mobile phone and some contacts are stored on your SIM card from your old device, there is an easy way to import them on your new mobile device. In this article, you will learn ...