
Another interface was the MOAP(S) platform from carrier NTT DoCoMo in the Japanese market. UIQ was a competing user interface mostly used by Motorola and Sony Ericsson that focused on pen-based devices, rather than a traditional keyboard interface from S60. The most prominent user interface was the S60 (formerly Series 60) platform built by Nokia, first released in 2002 and powering most Nokia Symbian devices.

The Symbian OS platform is formed of two components: one being the microkernel-based operating system with its associated libraries, and the other being the user interface (as middleware), which provides the graphical shell atop the OS. It was notably less popular in North America.

As a pioneer that established the smartphone industry, it was the most popular smartphone OS on a worldwide average until the end of 2010, at a time when smartphones were in limited use, when it was overtaken by iOS and Android. It was also prevalent in Japan by brands including Fujitsu, Sharp and Mitsubishi. Symbian was used by many major mobile phone brands, like Samsung, Motorola, Sony Ericsson, and above all by Nokia. Symbian OS is a descendant of Psion's EPOC, and was released exclusively on ARM processors, although an unreleased x86 port existed. It was originally developed as a proprietary software OS for personal digital assistants in 1998 by the Symbian Ltd. Symbian is a discontinued mobile operating system (OS) and computing platform designed for smartphones. Proprietary software, formerly Eclipse Public


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