This could be a problem. I noticed that the on screen buttons have already begun to burn in at the bottom of the screen, in 2 days!! I use my phone in portrait mode almost all of the time. Last night when I rotated to landscape I could still see the outline of the 3 onscreen buttons on the left end of the screen. If you have a N6 try this. Go into the clock app. It has a blue background. Turn your phone from portrait mode one quarter turn to the right. The area where the buttons usually are will now be on the left edge of the screen. Look closely, do you still see the buttons??