There's been some trepidation among Apple device users over the upgrade to iOS 6 given that it takes away some components while adding others. You wouldn't guess it from the initial upgrade rate, however. Both ChartBoost and Chitika have determined that about 15 percent of iOS data traffic was already coming from Apple's latest release within its first 24 hours of availability -- not bad, considering that it took Android 4.0 roughly eight months to reach a similar ratio and iOS 5 about five days to hit 20 percent. ChartBoost adds that iPhone owners were the quickest to upgrade, which is only logical when the iPhone 4S gets the most new features. The contrast between Android and iOS was entirely expected, knowing Apple's limited hardware pool and reduced carrier oversight. We're more interested in the differences between iOS versions: they suggest that whatever advantages people see in iOS 6, as well as a widespread over-the-air update system, have been enough to spur on many early adopters.