KaiOS is the web-based feature phone OS that Google has heavily invested in. We did a hands-on review of the platform earlier this year, and one of the major gaps in functionality was the lack of a WhatsApp application, especially considering KaiOS' main market right now is India. That has finally been addressed, as WhatsApp is now available in the KaiOS app store.
Read MoreKaiOS may succeed where Android Go Edition has failed
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.
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