Symbian

Symbian is an operating system (OS) and software platform designed for smartphones and currently maintained by Nokia. The Symbian platform is the successor to Symbian OS and Nokia Series 60; unlike Symbian OS, which needed an additional UI system, Symbian includes a user interface component based on S60 5th Edition. The latest version, Symbian^3, was officially released in Q4 2010, first used in the Nokia N8.

Symbian OS was originally developed by Symbian Ltd. It is a descendant of Psion's EPOC and runs exclusively on ARMProcessors, although an unreleased X86 port existed.

Operating system

The All over Model contains the following layers, from top to bottom:

• UI Framework Layer
• Application Services Layer
  • Java ME
• OS Services Layer
  • generic OS services
  • communications services
  • multimedia and graphics services
  • connectivity services
• Base Services Layer
• Kernel Services & Hardware Interface Layer