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

If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.

Federal agents have discovered an additional 200,000 SIM cards connected to a communication network in the New York Tri-State area.

The Secret Service discovered more than 100,000 SIM cards and 300 servers, which could disable cellular towers or be used to conduct surveillance. By Eileen Sullivan Reporting from Washington The ...