I have read all these posts and worked upon them I tested with both screen protector on screen and without screen protector. I was so mad I even tried to remove the screen too for that matter ... just exagerating. anyways as I said before nothing else but a hack to unlock screen may be of anyhelp. Plus May be Its a problem in eastern Parts of world because my proximity sensor in n97 didnt worked well too. Then again may be It malfunctioned due to falling or something because my mobile fell from my pocket a couple of twenty times too. still its very solid can not see any other scratch or bump on it