Android has been with us in one form or another for more than six years, and it has changed a lot in that time. Android now a historically big operating system. Almost a billion total devices have been sold, and 1.5 million devices are activated per day—but how did Google get here? The history of Android: The endless iterations of Google’s mobile OS article from ArsTechnica follow Android’s journey from Android 0.5 to Android 4.4. This is a very long article.