Hi, Android! Sorry your present is a little late, it took a while to wrap it. Five years ago yesterday, Google's then-CEO Eric Schmidt joined other members of the newly-formed Open Handset Alliance to announce the Android operating system. Back then, we were still nearly a year away from an actual Gphone (and yes, people really called it that) and Sprint and T-Mobile were the only US carriers even interested. Now, Android is installed on over 400 million devices, nearly every carrier in the world wants a piece of the action, and the platform as a whole is the single largest mobile OS ever.