I've never got the point of wrapping a phone in a case. To me personally it seems like a waste to put a case on a phone. I've used an Iphone 4 for the past 2 years and have accidentally dropped it on the sidewalk from my jacket pocket, I've kicked it across the street once by accident, and I've always kept it in my pocket with my keys and the only damage I've had is a tiny hairline scratch on the back. Maybe I've just been lucky but I don't thing cases are necessary and I won't be putting my 920 in one either.
Sorry for my long rant.