I did. Mine had a buzzing earpiece speaker. They told me I would need to make an appointment, because they may be able to "fix" it, but I'm not sure how much the guy I was talking to really knew about it, he was just defaulting to the "make an appointment" stance. I was nice to him, explained that I don't think it would be reasonable to attempt a fix on a one day old iPhone. He went and asked a "Genius" (I always want to put that in quotes...) and the "Genius" told him they would swap the phone. I then suggested that he could do the swap for me, and that no appointment was really necessary. He agreed, and five minutes later I walked out with a new 3Gs.