Content Introduction Historical Development Applications Versions Type of OS Kernel in Symbian OS Architectural design of symbian OS Threads Language supported Deadlock handling File Handling Security Issues User interface User Application development environment Process synchronization Resource management INTRODUCTION Symbian is a mobile operating system developed for smartphones that were originally used for Handheld PCs. By variety of major brands like Samsung, Motorola, and by Nokia. It popular OS till 2010 as replaced by android. Symbian consists variety of layers which prominently include the User Interface Framework, Application Services, Operating System Services, Base Services, Kernel Services, and Hardware Interface. The core…