How the T-Mobile iPhone 5 Changes the Game

In case you haven't heard, there's a new iPhone in townT-Mobile announced today it would begin selling the iPhone 5, becoming the last major wireless carrier in the U.S. to do so. But it changes things for other iPhone customers, too. First, a little background: To accommodate different radio technology and spectrum, there are actually two versions of the iPhone 5 (three if you count China, but that's not relevant here). One is for GSM networks (such as AT&T and T-Mobile) and the other is for CD...