Of the major companies that announced their earnings yesterday, two of them, AT&T and Apple, beat Wall Street estimates largely thanks to a single product : The iPhone. We're approaching the two year birthday of the device, and it still remains one of the hottest items out there. Ladies and gentleman, the state of the iPhone is strong. Yes, Apple actually sold less iPhones this quarter than the previous two quarters, but that was coming off of the always-hot holiday shopping quarter, and the one before that was when the iPhone 3G was still relatively new on the scene. All told, Apple has sold 21 million iPhones since its launch. Perhaps just a drop in the bucket compared to overall Nokia sales, but remember, Apple was not in the mobile business at all before 2007. And aside from just sales figures, in the past two years, it has revolutionized the industry. That is, of course, a cliche. But in this case, it's true.