Android’s true target isn’t the 19 percent of phones running OSs, like BlackBerry, Windows Mobile, and Mac OS. It’s the other 81 percent of phones, which aren’t smartphones and run operating systems you’ve never heard of like Nucleus and P2K. This large part of the market we call feature phones has become more and more powerful, hardware-wise, over the past few years. But these brawny handsets are still stuck with software stacks designed for the 20th century.