It has to be hard to track total market share - even if you know how many of each are sold, how do you know when a device stops being used?
Carriers could presumably supply that information, as they generally know what equipment the customers are using, but they don't all do that. Browsing and transaction data can be collected, but without any direct knowledge of the browsing/transacting habits of the owners of the various devices (which almost certainly differ as we have seen from iOS domination of those numbers), market share cannot be reliably inferred.
Otherwise these data always seem to be extracted from sales, and even those are questionable as not all manufacturers release numbers.
Yeah that's true. There probably aren't a lot of original iPhones still in use... nor those abysmal early Android phones. jk
Market share is for a certain timeframe, and not of all time.
I heard someone on another blog use the term "Android Collective"
That's actually a fitting description: an entire platform of products from many manufacturers. How on Earth can a single company compete with that?