Summary Install a SIM card in your phone to enable full device capabilities, and make sure to power it down before proceeding. Use a SIM card removal tool or a sewing needle to open the SIM card ...

A SIM card stores your subscriber identity data, which is needed to connect to a carrier's network. But do you still need one in 2025?

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.

So you've chosen Ultra Mobile as your carrier. Before you start enjoying your plan, you need to install your SIM card – here's a step-by-step guide.

Want to install an extra SIM card in your smartphone? Here's what you need to do just that.

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.

You can also find out by swapping physical SIM cards or calling your carrier. So, how do you add multiple SIM cards to your phone? We break down the process for iPhones and Android phones below.

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.