Nokia brings up an interesting question. Do smartphones need physical buttons?
We've seen physical buttons on our Windows Phones slowly disappear from the days when they were powered by Windows Mobile. Capacitive buttons replaced physical buttons and physical keyboards are now on-screen. But should it go further?
What remains is a power, volume and camera button. You could make a case where on-screen volume controls could replace the physical volume button and we already have a screen tap feature to capture photos. The power button may be the one physical button we can't live without but BlackBerry's Z10 shows how even that is not needed (they turn on the display by swiping the screen up, no power button).