Android is currently the most popular mobile operating system in the world, as research firm Gartner reported late last year that Android devices accounted for more than half of all smartphones sold worldwide in the third quarter of 2011. Since its debut in the fall of 2007, Android has appeared on numerous popular smartphones for several carriers including Verizon's Motorola Droid and Sprint's HTC Evo 4G.
As an open-source operating system that is free for device manufacturers to use, Android has been adopted by a wide range of handset makers including HTC, Motorola, LG, Samsung and Sony-Ericsson. Google recently announced that it is now activating more than 850,000 Android devices every day and that there are more than 300 million Android devices active across the globe.
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