Mobile phone OS is one area which has tremendously grown in the past decade. iPhone, Android and Windows Phone were some of the major OS we have seen in last decade and all of these evolved since their first release. Here is an nice infographic on the evolution of mobile phone operating systems. It dates back from 1996 when Palm OS was released to 2010 when Windows Phone 7 was released. The image is a courtesy of [x]cubelabs.
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Infographic by [x]cubelabs. Thanks to Arun for this tip.