Nokia has remained a giant in the low-end mobile market, so after Java Symbian was the most used in the mobile phones till a couple of years ago. Symbian. It means that any other company will have to take permission from Nokia before using this operating system. Symbian OS is officially the property of Nokia. Comparison Of Top Mobile OS. Popular mobile operating systems are Android, Symbian, iOS, BlackBerry OS and Windows Mobile. Consider it the backbone of all of your favorite applications and programs. These two mobile OSes take different approaches to the mobile operating system. Apple … Apple distributes the only devices that natively support iOS, and it takes a "walled garden" approach, in which Apple regulates all mobile apps and services that can run on the iOS devices. A mobile operating system, sometimes called a mobile OS for short, is an operating system that runs only on mobile devices. Because smartphone operating systems are so integrated with the look, feel and function of a mobile phone, many people base their choice of device around which operating system it uses. 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.