The units I tried at the show did not exibit the phone problems you are experiencing. I made calls and used the unit without any freeze ups. Have you loaded any other applications? Perhaps it is an interaction with some application. I specifically asked about the screen and was told that it was much more scratch resistant than the 7100 (same as the new screen on the 7105). I realize that concrete can be very tough and the unit can experience several G's of force in a 3 foot fall so maybe the screen isn't that tough but I would not expect the unit to scratch easily in your pocket or daily use.