Around 90 percent of iOS handheld owners are using iOS 4.0 or better, a pair of developers say. Bump is offering the most precise statistics, noting that 89.73 percent of its iOS base is on v4.x, whereas 10.25 percent is using v3.x. A sliver, 0.02 percent, is still on v2.x. The OS dates back to the iPhone 3G, and was the very first version of the platform to support apps. Because the statistics are app-based, it's unknown how many people may still be on iOS 1.x.
