Apple may have taken a long while to get users upgrading to iOS 8, but it isn't having any such trouble with iOS 9. The iPhone maker has revealed that more than half of all iOS devices are already running the new software less than a week after it launched. That's the fastest adoption rate yet for the platform, if you ask the folks in Cupertino. That's certainly better than on Android, where just 21 percent of users are running Lollipop, but it's not really that surprising when you realize that Apple has bent over backwards to put iOS 9 on as many devices as possible.