That's one of the advantages of Soft silicone cases. They can take a hit and they keep both the phone and the case undamaged. Of course they also have a few disadvantages like not looking as nice, attracting a lot of dust and lint, getting deformed if you take the phone in and out constantly (which sometimes is a requirement in order to clean it). I have a cheap iLuv case with a screen protector (which was the only thing I found) and yesterday had my first drop. Both the case and the iPhone 4 were unharmed, but the fall seemed messy.