Over 500 million iOS devices sold so far.
Apple has announced that iOS 6 is now installed on 300 million devices. The milestone has been achieved five months after iOS 6's release, which coincided with the launch of the iPhone 5. Apple's marketing head Phil Schiller said that iOS 6 "may be the most popular new version of an OS in history."
Apple’s chief executive Tim Cook recently revealed that 500 million iOS devices have been sold thus far. Consequently, 300 million devices running iOS 6 would translate into 60 percent of the overall installed base.
Back in the October of 2012, over 100 million iOS users adopted Apple's latest mobile OS, with iOS 6 installed on 60 percent of North American iPhone users.