With mobile devices getting smarter all the time, they need their own operating system (OS) to manage resources. Mobile OS is a generic term that refers to the various operating systems available on mobile devices. Mobile OS are comparable to the standard OS that run on desktop or laptop computers (e.g., Windows, Linux, etc.), but are smaller and less sophisticated and only handle issues specific to mobile devices.
The most popular mobile OS, found in all Nokia phones, is Symbian 
. Symbian is also present in various models of Sony Ericsson, Motorola, Samsung, and other cell phones, and particularly in data-enabled devices. Data-enabled devices allow various data applications like email, web browser, and word processing applications to run on your phone apart from normal voice communications. The mobile OS field is getting so large that Microsoft, the world leader in computer OS, has now entered it with Windows Mobile OS for mobile phone users. Windows Mobile OS gives a Windows-like feel when using mobiledevices and makes navigation and application accessing easy. Almost all smart phones are enabled with some mobile OS.
Mobile OS manage files, memory interaction with other devices. They also come with various built-in applications, including the Outlook Express email client. Mobile OS have virtually made mobile devices into small computers, with a wide array of features including terrific display resolution and sound output.
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