Callers are telling me they are picking up a tremendous amount of background noise on my end when I'm using my new iPhone 5 with earbuds regardless if I'm only with a few people or in a larger room. Callers did not seem to complain when I used the iPhone 4S with earbuds as it did not seem to pick up the background noise when I was on calls. One caller said I sounded like I was at a rock concert and it was relatively quiet on my end. Anybody else experiencing this?