A huge contributor to Apple's high retention amongst iPhone users is attributable to iOS — for most of the world it is unimaginable for an iPhone user to upgrade to anything but another iPhone: there is too much of the user experience, too many of the apps, and, in some countries like the U.S., too many contacts on iMessage to even countenance another phone.
Unlike the rest of the world, in China the most important layer of the smartphone stack is not the phone’s operating system. Rather, it is WeChat, making iOS irrelevant for the Chinese. WeChat is your phone — and it works the same on iOS or Android.
Read the full article for a deeper analysis around this interesting observation.