These are proven fixes you can use if you’re looking to resolve the “No SIM card detected” or “No SIM card installed” issue on your iPhone or Android smartphone.

What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...

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.

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.

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 ...

The Apple iPhone 14 series has no physical SIM card slot in the US, but other markets do include it. You can find a table in the second section of this article with the different variants available.

If you want to upgrade your iPad to have 3G/4G capabilities, you need to equip it with a SIM card. Our beginners' tutorial explains where to get the right SIM card, and how to do install it.

If, on the other hand, your transferring a physical SIM to an eSIM on a completely different iPhone, here's how to do it.

The iPhone 16 series is great, but you have to know what's going on with the whole eSIM and dual-SIM confusion first.