I would argue that the fall from your pocket caused your phone to break.
It's my opinion that the only case which will completely protect your phone in a fall is a full-body "pocket" or slip-on case. All other cases are simply clip-on and don't protect the screen; you have to be able to see what the screen is displaying, after all
Body Glove makes an ok-looking neoprene (like wet-suit material) slip-on case with a soft, clear window on the front. You have to take the phone out to use it, but at least you can see who's calling without removing the phone first. It provides a soft cushion around the entire phone, which will protect it a lot more than a hard-plastic clip-on style "scratch prevent" style case.
Good luck, and stop dropping your phone!