Nokia E51 is a Symbian OS mobile phone by Nokia announced on 18 September 2007 as the replacement of the Nokia E50 in the business-focused Eseries line. It was the second Nokia UMTS / HSDPA dual band device. The phone was available with a black, silver or bronze-coloured border and backplate. It has a slim body made of stainless steel, and was the smallest Nokia smartphone of the time, yet is still technologically capable like other S60 devices of the time. A version without the integrated camera also existed. The E51 was highly acclaimed and was succeeded by the Nokia E52.
Nokia E51
Photograph taken by the Nokia E51.
Symbian is a discontinued mobile operating system (OS) and computing platform designed for smartphones. It was originally developed as a proprietary software OS for personal digital assistants in 1998 by the Symbian Ltd. consortium. Symbian OS is a descendant of Psion's EPOC, and was released exclusively on ARM processors, although an unreleased x86 port existed. Symbian was used by many major mobile phone brands, like Samsung, Motorola, Sony Ericsson, and above all by Nokia. It was also prevalent in Japan by brands including Fujitsu, Sharp and Mitsubishi. 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 notably less popular in North America.
Symbian v9.1 with a S60v3 interface, on a Nokia E61