Although there is an option to enable on screen navigation buttons if you want to. (themrphone.com)
The camera app has its main buttons on the base of the app, just above the on - screen navigation buttons for the device, with a round shutter button in the middle. (techpp.com)
Since the S2 Pro comes with minimal bezels, we expect to see on - screen navigation buttons instead of the capacitive buttons. (phoneradar.com)