I finally joined the digital age and ordered my first smartphone, the iphone 4. Given its expense i would like to get the best protection for it for when it is dropped. Which protective shield should i buy for this iphone? I've seen some people with the plastic versions, some with rubber ones. Any ideas on which is the best one, brand? (perhaps a link)? Do i need a screen protector too, or is that part of the same overall shield protector. Please excuse my ignorance. I still carry around an old Nokia from 5 years ago.