Shouldn't this be considered a defect? (I'm nervous about dismantling my phone).
Also, why does it only happen while on a call and not always? Unless/until the other party hangs up, my phone is useless. Argh
After reading responses on here I cleaned the sensors on the front of my phone an it totally worked. Guessing makeup buildup was making my phone think it was still against my face an licking the screen to keep me from pressing buttons.