The Symbian platform is an open source operating system (OS) and software platform designed for smartphones and maintained by the Symbian Foundation. The Symbian platform is the successor to Symbian OS. The Symbian platform was officially made available as open source code in February 2010.
Symbian^1, as the first release, forms the basis for the platform. It incorporates Symbian OS and S60 5th Edition (which is built on Symbian OS 9.4) and thus it was not made available as open source.
Symbian^2 was the first royalty free version of Symbian. While portions of Symbian^2 are EPL licensed, most of the souce code is under the proprietary SFL license and available only to members of the Symbian Foundation and as of February 2010[update] there are no devices with this version announced, however Nokia have chosen to backport many Symbian^2 features (including kinetic scrolling and widget homescreen) to Symbian^1 and provide them as software updates.
Symbian^3 was announced on 15 February 2010. This is the first fully open source version of Symbian, following the completion of the release of the entire Symbian codebase earlier that month. The Symbian^3 release introduced new features such as HDMI support, a new 2D and 3D graphics architecture, and UI improvements. The first mobile phone to feature this fully open source OS (Symbian^3) is Nokia N8.
Symbian^4 is expected to be released in the second half of 2010, with devices shipping in 2011. Symbian^4 provides an entirely new user experience built with Qt.
The first phones running the open source version of the platform will be Symbian^3 phones, likely to be announced in the first half of 2010 and to start shipping in the second half of 2010
For more details check out te official symbian OS website http://www.symbian.org/
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