Apple CFO Peter Oppenheimer announced that the adoption rate for iOS 7 has ticked up a couple of points since the end of December, now standing at 80%. iOS 6 is installed on 17% of iOS devices, while iOS 5 and earlier is installed on 3%, according to the Apple Developer Portal. That compares to what Apple says is single digit adoption of the latest version of Android, KitKat, and, when looked at individually, version to version, makes iOS 7 the most popular operating system instance in the world.
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Source: Apple Developer Portal