Originally Posted by
adrianlandy I am on 4.1 at the moment any other ideas.
You can also hold the phone a little bit lower down. The proximity sensor is right above the ear speaker. If it's not covered sufficiently when you're on a call, it will turn the screen back on. If that doesn't solve your problem, take it to the Genius Bar. They'll swap it out for you. I had the same problem, and they gave me a new one and this one seems fine.