Symbian is a mobile operating system (OS) and computing platform designed for smartphones and currently maintained by Accenture.The Symbian platform is the successor to Symbian OS and Nokia Series 60; unlike Symbian OS, which needed an additional user interface system, Symbian includes a user interface component based on S60 5th Edition.
Symbian OS was originally developed by Symbian Ltd. It is a descendant of Psion's EPOC and runs exclusively on ARM processors, although an unreleased x86 port existed.
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Symbian Belle is an update to Symbian Anna and the second update to the Symbian^3 platform. In the summer of 2011 videos showing an early leaked version of Belle running on a Nokia N8 were published on YouTube.
On August 24, 2011, Nokia announced Belle officially for four new smartphones, the Nokia 600, Nokia 603, Nokia 700, and Nokia 701. They also announced that Belle would be coming to all existing Symbian^3 devices in the fourth quarter of 2011.
Symbian Belle adds to Anna's improvements with a pull-down status/notification bar, deeper near field communication integration, free-form re-sizable homescreen widgets, and six homescreens instead of the previous three.
Symbian Anna is an update to Symbian^3, released by Nokia in April 2011 as part of the launch of the Nokia X7 and Nokia E6 smartphones.
Symbian Anna includes such improvements as a new browser, a virtual keyboard in portrait orientation, new icons and real-time homescreen scrolling.
Symbian^4 was expected to be released in the first half of 2011. However, Nokia announced in October 2010 that Symbian^4 will not ship in a separate release. Instead, many of the UI enhancements planned for Symbian^4 will be released as updates to Symbian^3.
Symbian^3 was announced on 15 February 2010. It was designed to be a more ‘next generation’ smartphone platform. The Symbian^3 release introduced new features like a new 2D and 3D graphics architecture, UI improvements, and support for external displays via HDMI. It has single tap menus and up to three customizable homescreens. The Symbian^3 SDK (Software Development Kit) was released September 2010.
The Nokia N8, Nokia E7-00, Nokia C6-01 and the Nokia C7-00 were the first line-up of Symbian^3 devices
Symbian^2 was the first royalty-free version of Symbian. While portions of Symbian^2 are EPL licensed, most of the source code is under the proprietary SFL license and available only to members of the Symbian Foundation. On June 1, 2010, a number of Japanese companies including DoCoMo and Sharp announced smartphones using Symbian^2.
Symbian^1 is the first release of the touch optimized version of Symbian OS. It incorporates Symbian OS and S60 5th Edition (which is built on Symbian OS 9.4) and thus it was not made available in open source.
The Nokia 5800 XpressMusic is the first device to feature Symbian^1 followed by the Nokia N97 which became the first in the N-Series running Symbian touch based OS.
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