As documented in its quarterly earnings reports over the years, Apple reported total sales of 472 million iPhones between the device's 2007 launch and the end of 2013. With analyst estimates of over 38 million units for the current quarter ending in just a few days, the company has undoubtedly already sold its 500 millionth iPhone, a milestone that passed without mention from the Cupertino company, notes Forbes.The consensus would have placed the milestone sale around March 8 given that entering the quarter Apple had sold 472 million iPhones. So even if it proves a bit high as it did last quarter, we’ve crossed the point where it’s safe to assume that Apple has sold 500 million smartphones in less than 7 years. And the most recent 100 million took somewhere between 2-6 weeks less than the previous 100 million did.Apple is known for celebrating notabl