Some interesting graphs on iOS 5.1 upgrade stats. iOS 5.0.1 and 5.1 are notable because they are the first upgrades to be delivered OTA. Unless this data is a unique segment and not representative of the larger ecosystem (I don’t think that’s the case), this is pretty impressive.
This is why the upgrade process is so important to client side applications, especially when you manage a platform. After installation keeping a user running the latest and greatest is critical. It impacts your entire ecosystem, which in Apple’s case includes the web, iOS developers, tech support, and yes even wireless partners.
Google’s biggest mistake was leaving hardware vendors and wireless providers in charge of managing upgrades. They are carrying a lot of baggage from old Android devices that Apple doesn’t. This is only going to be more amplified in the next 12-24 months as Apple users stay more current and Android continues to fragment.