They include S60 (Nokia, Samsung and LG), UIQ (Sony Ericsson and Motorola) and MOAP(S) (Japanese only such as Fujitsu, Sharp etc.).
With no major competition in the smartphone OS then (Palm OS and Windows Mobile were comparatively small players), Symbian reached as high as 67% of the global smartphone market share in 2006.
In June 1998, Psion Software became Symbian Ltd., a major joint venture between Psion and phone manufacturers Ericsson, Motorola, and Nokia.
Although Symbian was difficult to program for, this issue could be worked around by creating Java Mobile Edition apps, ostensibly under a "write once, run anywhere" slogan.
It was also prevalent in Japan by brands including Fujitsu, Sharp and Mitsubishi.
As a pioneer that established the smartphone industry, it was the most popular smartphone OS on a worldwide average until the end of 2010 – at a time when smartphones were in limited use, when it was overtaken by Android, as Google and its partners achieved wide adoption.
The Symbian platform was officially made available as open source code in February 2010.
Nokia became the major contributor to Symbian's code, since it then possessed the development resources for both the Symbian OS core and the user interface.