I don't have any trouble turning the phone on or off with the case on. I know some cases do have stiffer buttons and maybe I've just gotten used to pressing harder. As far as protecting the curved part of the screen, the top and bottom of the case have bumpers to help absorb the impact should the phone be dropped or fall. For better protection, you can either leave on the film that Samsung put on, or use a glass screen protector. I just left the Samsung film on because I've had too much trouble with glass screen protectors because they don't stick well or leave the phone not very responsive due to the extra thickness. Hope this helps.