The Series 90 (formerly ''Hildon'') is a platform for mobile phones that use Symbian OS. It was developed by Nokia in collaboration with Psion. It was released in 2003 and was going to be the platform for the

Nokia 7700 The Nokia 7700 (Model - M Type RAL-2) is a smartphone produced by Nokia, announced in October 2003 but never released. It was produced as a prototype unit between 2003-2004. It was expected to be the first smartphone running the Series 90 GUI o ...

which was cancelled, but did eventually make it to market with the Nokia 7710. Nokia discontinued Series 90 as a platform, but merged its technology into S60.All About Symbian -Series 60 and 90 merged
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/ref> Although only one production Series 90 device was made, a form of the GUI continued on as Nokia's Hildon user interface in the Maemo shipped with Nokia Internet Tablets.

Compatibility

Series 90 is completely incompatible with Series 60 (S60) and UIQ, the most popular platforms for Symbian smartphones. However, some applications from Nokia Series 80 (software platform), Series 80 Communicator devices – such as the Nokia 9300 – will function under Series 90.

History

Essentially, Series 90 is a development of the Psion Eikon GUI as used on the Psion 5, Series 5, Series 5mx, Psion Revo, Revo, netPad, Psion Series 7, Series 7 and Psion netBook, 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

, which was never released, had only an on-screen keyboard for text input; the Nokia 7710, 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.

References

{{Mobile operating systems Nokia platforms Smartphones