Apple released iOS 6.1 recently, and they also revealed how many users of their iOS devices have update to iOS 6 and above, over 300 million devices have been updated to iOS 6.
“iOS 6 is the world’s most advanced mobile operating system, and with nearly 300 million iPhone, iPad and iPod touch devices on iOS 6 in just five months, it may be the most popular new version of an OS in history,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “
When iOS 6 was released originally, quite a large number of people avoided updating because of the lack of Google Maps on iOS 6, which was replaced by Apple Maps.
Source Apple