Series 60 Platform is based on Symbian OS, a mobile Operating System from Symbian Ltd. It is an open , highly robust Operating System for data-enabled mobile phones. Symbian OS (formerly called EPOC) is a 32-bit preemptive multitasking Operating System that is central to the success of Series 60 and other user interface platforms such as Series 80 and Series 90, the communicator platforms from Nokia, and UIQ from UIQ Technology AB, a division of Symbian.
Series 60 Platform is a complete smartphone reference design, developed by Nokia Mobile Software, and is currently being licensed by several of the worlds key handset manufacturers.