OK, I've seen several people stating that their proximity sensor was not telling the phone to turn off when they put it to their ear, which would cause you to hit buttons while in a call. While playing with my new toy (the Photon), I turned on the SETTINGS --> DISPLAY SETTINGS --> In-Pocket detection; apparently this conflicts with the proximity sensor. As soon as I turned this back off, my proximity sensor appears to work again. Just thought I would share for anyone else with this issue.