This figure plays second-fiddle in Apple’s press release for the forthcoming release of the iPhones 6S:
“Customer response to the iPhone 6s and iPhone 6s Plus has been incredibly positive, we can’t wait to get our most advanced iPhones ever into customers’ hands starting this Friday,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “iOS 9 is also off to an amazing start, on pace to be downloaded by more users than any other software release in Apple’s history.”
For what it’s worth, Mixpanel is currently reporting adoption closer to 36% among devices and apps that include its analytics software. What seems most impressive is that a fair chunk of the devices that have updated to iOS 9 in the past five days are over four years old.