I got my 3G on July 11th at an AT&T store. I did the negative black test today and discovered that I have some negative black issues. I didn't buy the phone at an Apple store, but would I be able to set up a Genius appointment to replace my iPhone with a new one? Is this a warranty issue? Since the stores in my area most likely don't have any in stock, would I still be able to go to an Apple store a week from now and replace my phone?