The new generation of mobile devices are now coming with physical, on-screen navigation keys. But many people prefer the capacitive keys we find on samsung devices, and many lumia devices came with same navigation keys what do you prefer
My only real complaint about onscreen is that the haptic feedback seems off. I have a dual SIM 640 and 730 I use for travel and both seem that there is a slight delay, while my 920 is just right.