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A mobile operating system (mobile OS) is an OS built exclusively for a mobile device, such as a smartphone, personal digital assistant (PDA), tablet or other embedded mobile OS. Popular mobile operating systems are Android, Symbian, iOS, BlackBerry OS and Windows Mobile.
A mobile OS is responsible for identifying and defining mobile device features and functions, including keypads, application synchronization, email, thumbwheel and text messaging. A mobile OS is similar to a standard OS (like Windows, Linux, and Mac) but is relatively simple and light and primarily manages the wireless variations of local and broadband connections, mobile multimedia and various input methods.
To adapt to inherent mobile device environments, a mobile OS runs on limited resources emphasizing communication, such as random access memory (RAM), storage and central processing unit (CPU) speed.
Below is an example describing how text messaging works on a mobile OS:
With the exception of Android (developed by Google), mobile operating systems are developed by different mobile phone manufacturers, including Nokia (Symbian, MeeGo, Maemo); Apple (Apple iOS); Research In Motion (RIM) (BlackBerry OS); Microsoft (Windows Mobile, Windows Phone) and Samsung (Palm WebOS and bada). Android, LiMo, Maemo, Openmoko and Qt Extended (Qtopia) are based on the Linux open-source OS.