1) Android 2.3 Gingerbread has the highest total crash rate, at 1.7%. Other versions of Android — Ice Cream Sandwich, Jelly Bean, and KitKat — have a crash rate of 0.7%.
2) iOs 7.1 has a crash rate of 1.6%., and the rates for iOS 7.0 and iOS 5 are 2.1% and 2.5% respectively.
3) Phone versions of both Android and iOS are more stable than their tablet versions.