Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)
Bumpers do work. I dropped my 4S on the pavement and all that was damaged was the bumper that got a big dodgy on one of the corners with no damage what so ever to the phone itself.