How can i know what os my mobile phone has just according to its features ?

I don't have any user manual and secret codes and cann't find these on the internet . so how can i find what OS my mobile phone has ? it is NEC N880 made in singapore but not exist in NEC company database !

What OS this mobile phone ( NEC N880 ) has ?

hello
I have this mobile phone known as NEC N880 smartphone . I want to know what OS has it and from where can i download its usb cable drivers ? and any more details about it ?
Thanks