I am surprised there are not more threads about this huge issue. Maybe it is hearing dependant, but there is a crackling/buzzing noise from the ear piece area of the iphone whenever 3g is accessing anything. You need to be in a quiet area to hear it. I have already replaced my 4s and still have issue, I have listened to many other 4s phones and they all have the issue. Once you start hearing it, it is extremely annoying.