Having recently switched from an iPhone to an Android smartphone, I really question the "most advanced mobile OS" claim. Apple phones are more polished, more logically organized, easier to use, more intuitive... fair enough. But more advanced? Not by a long shot. The amount of features and customizable options on Android is insane. You can argue that this is not necessarily a good thing for the average user, but you…
Then again, I probably use a different definition of the word "advanced" than most people here. To me, iOS is the more advanced operating system because it manages to hide its complexity from the user. Adding features is easy. What is not easy is making sure those features are coherent and actually make the device easier to use.