When I am on a call it seems IMPOSSIBLE to lock the screen and keep it from making the screen buttons available to click. IE: I dont want the touch screen to become avaliable while Im on a call. My face/cheek magically finds teh combination to do all of the following on 90% of my calls. 1. it mutes them, and usually switches back to the desktop and by the time I have figured out how to get back to the keypad and un-mute them they figure they lost teh call and they hang up. 2. it switches to the keypad and starts dialing random numbers. also seems to END calls from this screen more often than others. 3. it switches to the button that makes the keypad available to dial another party for a 3way call, this also has the effect of muting me to the other party and NOWHERE does the phone tell you that you muted the other party. 4. the phone finds its way back to the desk top and launches another program, you name it (my music, Pandora, Google maps, what ever my face hits). I have even deleted contacts while holding the phone to my ear with my shoulder. Anybody else have this problem, all my co-workers in the surrounding cubicles laugh their a$$ off all day as call after call gets dropped. Literally 80% of the calls I make are affected by this situation. Please hackers make an app (write some code) that I can use the top lock button to lock/unlock the touch screen while I am in a call. I only want the screen to unlock (when in a call) IF I press the top button.