The images show a series of three design mockups of a what appears to be heavily-modified version Android on a Nokia device, but it's not clear that this operating system is in fact Android ...

Although Android has long featured Easter eggs, having started with the 2.3 version named Gingerbread, one of the first playable secrets is found in Android's 5.0 operating system, named Lollipop.

That’s unlike Pixel and Nexus phones before and since, for which Google still offers years of downloadable Android OS images. We’ve asked Google for more information. Google removes old Pixel ...

Android 2.0 introduces a new graphics architecture with better performance and improved hardware acceleration. It also brings SMS/MMS search and a handful of calendar improvements into the OS.