The Symbian OS Platform combines the greatest benefits of cost-effectiveness, rapid innovativeness and creating reliable and fun applications that provide the best user experiences with the Symbian brand. Symbian OS is an open source operating system designed exclusively for mobile devices and data enabled smart phones. It is a secure as well as customizable OS platform for global mobile programmers and offers them an integrated applications environment to provide advanced data services and high quality mobile telephony. Earlier, there were a lot of platforms based upon Symbian OS that provided SDKs for the developers who were willing to build applications for various Symbian OS devices. The primary ones among them were UIQ and S60. The technology is so potent that gives industry the power to create devices that are capable to handle and store large amounts of data, provide a quick and responsive, user experience, and deliver brisk networking. Symbian OS is a "leading figure" in the smartphones and provides an opportunity to developers and designers worldwide can now creatively work on different ideas and create new custom apps that would maintain Symbian as the world's most popular and sought after smartphone platform.