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.

The newer eSIM technology, which is quickly becoming the standard on high-end phones, is safer and more convenient.

Seeing “No SIM” or “Invalid SIM” on iPhone? Check your SIM card, restart, or update your carrier settings. Simple fixes often ...

All of your contacts will be written to the SIM card, which is called a "SmartChip" on LG phones. Remove the SIM card and install it in a different phone to access the contacts you just copied.

Switching to the Un-Carrier can be exciting, but you have to know how to get set up. Here's how to activate a T-Mobile SIM card.

A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.

Criminals don't need a physical SIM card to make the swap. In most cases, they call the mobile carrier and impersonate a victim. Here's how to protect yourself.

SIM Swapping: How the Latest Cellphone Hacking Scam Works, And How to Protect Yourself The scam – involving control of the SIM card we all have in our phones – is shockingly simple ...