Originally Posted by Robchaos

The developer made it so that you can hit the back button on your phone to unlock the screen when it is dark outside and the light sensor doesn't know the phone has moved from your face.

Useful App despite its one limitation (not working in a dark room). I wonder if the G sensor could be incorporated into the app. Maybe the phone could sense the ambient light level before the call is answered and if it senses no light it could go to a backup mode using the G sensor if the phone is upright to your ear screen is locked. You bring it down screen facing up and screen unlocks.