Originally Posted by bizmog

I know this is an old thread, but I have been having this same issue. About 20 times in 2 months i have lost a call only to find im in Airplane mode. I am positive I am not holding down the end key, as it is nowhere near my face. I believe it is caused by the location of the sensor (left of speaker i think) and the notification icons. The proximity sensors hangs of the side of my ear and turns the screen on, and the rear part of my ear rubs the top right of the screen, which launches the full screen notification window. Another ear rub on the top right pushes the comm manager link on the top row of notifications, one more pushes the airplane mode button in the comm manager. Seems unlikely but i have verified this with a friend watching.

I would bet most of us having this problem are either left handed, or just commonly hold the phone with their right hand to the right ear. I have never had this happen with the phone in my left hand, as the sensor and the buttons dont line up.