472 million iPhones were sold between 2007 and December 2013. Taking the 42 million projected sales of Morgan Stanley and the average of 38 million sales suggested by other analysts, Forbes reckons Apple broke the 500 million barrier on or around March 8th.
Interestingly, sales of iPhones appear to be speeding up, with Apple reaching the current milestone six weeks faster than when it made it to 400 million devices sold.
While Apple has been more than happy to celebrate billions of app sales and even the 30th anniversary of the Mac, it seems to be keeping quiet on this one until the official numbers are in at the start of April.