A guide to SIM cards, the small chips that connect your phone to a cellular network

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.

How to remove the SIM card from your iPhone to replace it or throw it away

To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.