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AT&T is Apple's exclusive U.S. carrier for the iPhone because AT&T CEO Randall Stephenson let Steve Jobs have his way on pricing plans when other carriers would not. AT&T also pays Apple $18 a month per iPhone. So what has all that flexibility bought? An exclusive deal through 2012. But after that, no promises. Yesterday Apple's Tim Cook told Goldman Sachs investors the one-carrier model may not be around much longer."We're not married to any business model," Cook explained. "What we're married to is shipping the best phones in the world." And the carriers? They're just girlfriends. (Photo by andycarvin)