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iOS
iOS (originally iPhone OS) is a mobile operating system developed and distributed by Apple Inc. to support iPhone and iPod Touch and other Apple devices such as the iPad and Apple TV. 

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ANDROID
Android is a Linux-based operating system for mobile devices such as smartphones and tablet computers. 

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WINDOWS PHONE
Windows Phone is a Microsoft's mobile operating system . 

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BLACKBERRY
BlackBerry devices are smartphones, designed to function as personal digital assistants, portable media players, internet browsers, gaming devices, and much more. 

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