iOS iOS, an operating system from Apple, was originally developed for the iPhone. Later it was extended to support iPod Touch, iPad and Apple TV. Apple’s App Store contains more than 500,000 applications and boasts more than 25 billion downloads collectively. It holds the reputation of intelligent UI creator which is based on the concept of direct manipulation, using multi-touch gestures. Android Android is a Linux based mobile operating system developed by the Open Handset Alliance led by Google. Android boasts large community of developers writing applications extending the functionality of the devices. It has 450,000 apps in its Android Market and download exceeds 10 billion count. BlackBerry OS BlackBerry OS is developed by Research In Motion (RIM) for its line of smartphones. This operating system is known for its native support for corporate e-mail through MIDP allowing complete wireless activation and synchronization with Microsoft Exchange and Lotus Do...