Usually Nokia Uses Symbian OS or some times they uses Windows Mobile OS to their phones. but they have never made a phone with Linux operating System. Now they going to launch such kind of phone with many features. if you know Nokia N800 phone,Nautilus is very similar to it in appearance. it's a internet tablet phone which has 4.2 inch touchscreen. Nautilus is going to be launched on end of year 2009.
Like N800 Nautilus has slider QWERTY keypad. as Nokia mentioned it's a auto sliding keypad.