Popular smartphone operating systems include Symbian OS, Android OS, Windows Phone, iOS, Blackberry, etc. According to the open degree of source code, kernel and application environment, smart phone operating system can be divided into open platform (based on Linux kernel) and closed platform (based on UNIX and Windows kernel) two categories.

In 1996, Microsoft released the Windows CE operating system, Microsoft began to enter the mobile phone operating system.

In June 2001, Symbian company released Symbian S60 operating system, as the start of S60, the smart phone to improve a concept, Symbian system with its huge customer base and terminal share to dominate the world's low-end smart phone market.

In June 2007, Apple's iOS stepped on the stage of history, and the concept of finger touch began to enter people's lives. iOS perfectly integrated several functions such as innovative mobile phones, touchable widescreen, web browsing, mobile games, and mobile maps.

In September 2008, when Apple and Nokia were still indulging in the fight between the two companies, Android OS, the small robot designed by Google research and development team quietly appeared in front of the world, good user experience and open design, so that Android OS quickly entered the smart phone market.

Symbian (Symbian OS)

The predecessor of Symbian (Chinese translation "Symbian") is the EPOC operating system developed by Psion, which was founded in 1980. Psion is a joint venture formed in 1998 by Nokia, SONY Ericsson, MOTOROLA, Siemens and other major mobile equipment manufacturers to develop mobile phone operating systems.

Symbian OS(Symbian operating system) is a real-time, multi-task 32-bit operating system, with low power consumption, low memory consumption and other characteristics, very suitable for mobile devices such as mobile phones. Its biggest feature is the use of system kernel and human-machine interface separation technology, low requirements for hardware, after continuous improvement, It supports GPRS(General Packet Radio Service), Bluetooth, SyncML(Synchronization Markup Language), and 3G technologies.

Mobile phones using Symbian OS were mainly from Nokia, but on January 24, 2013, Nokia announced in its earnings conference call that the Nokia 808 would be the last Symbian phone.