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

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.

What you need to know about the major market indices. What You Need to Know About the Major Market Indices If you've ever listened to the financial news, you know that the Dow, the S&P and the Nasdaq ...