Nokia Series 90

Nokia Series 90 is a platform for mobile phones that use Symbian OS. It is developed primarily by Nokia and currently used only on the Nokia 7710.

Essentially, Series 90 is a development of the Psion Eikon GUI as used on the Series 5, Series 5mx, Series 7 and netBook machines. It has been modified to be controlled entirely through the touchscreen, supplemented by the 77x0's seven hardware buttons and rocker-dial. The Nokia 7700, which was never released, had only an on-screen keyboard for text input; the 7710 added basic handwriting recognition. Applications now have only a single menu tree, accessible from the title bar at the top of the screen; there is no Exit or Quit option in most apps; and a button bar has been added to the right hand side of the screen, resembling that of the Nokia Communicator smartphones.

Unfortunately, Series 90 is completely incompatible with Series 60 and UIQ, the most popular platforms for Symbian smartphones. However, some applications from Nokia Series 80 Communicator devices -- such as the Nokia 9300 and Nokia 9500 -- will function under Series 90.

Although no new Series 90 devices are expected, a form of the GUI lives on as Nokia's "Hildon" user interface in the Internet Tablet OS shipped with the Nokia 770, N800 and N810 Internet Tablets.