Following news that Samsung is on track to ship 10 million Galaxy S4's by end of May now comes news that they have doubled that, 20 million phones shipped, as of the end of June.

That is 1.7 times faster than the sales of the S3. The report comes from Yonhap News and Samsung has yet to confirm it has sold 20 million units. They will be holding an earnings call later this week at which point we should know for sure.