So I've had the white iPhone 4 since June of 2011. It hasn't caused me any problems until I switched cases for it. The case I had been using was rubber and it started to stretch. Today, when I got out of my car, my phone fell out on the pavement and the screen cracked. I've heard that they will replace it for you at the Genius Bar, but here's my catch: I didn't purchase the warranty on it. What are my (most inexpensive) options? Help!