Competition is always good for any market, but when it comes to smartphone platforms, there have only been two viable choices for the better part of a decade — Android and iOS. Microsoft poured billions into Windows Phone and Nokia, only to capture a small fraction of the market for a few years. Tizen, Sailfish, webOS, Symbian, Ubuntu Touch, and Firefox OS also failed to take a decent chunk of users away from Google and Apple.

There's another mobile operating system on the rise, but this one is special for a few reasons. First, it's not necessarily trying to unseat iOS and Android — it's designed to run on feature phones.