I thought I had noticed a difference as well; Im on my second phone, and the first seemed to have been much louder. I took my phone to the Apple store to complain, as it's so quiet now, I can barely hear people talking on it unless it's dead silent where I'm at. In the car, forget it; can't hear. The girl at the Genius bar took it in back for a couple minutes then came out and handed me the phone, on which she had already dialed the store's number. It was much louder. I looked at the phone and realized it was the same one (same nicks, etc). She said the grill on the speaker gets lint and dust and crap stuck in it, and she used a tiny stiff toothbrush to clean it off, and blew out the mic and speakerphone as well as the headphone jack. I have a really skinny short bristled brush that came with a set of hair clippers that fits in there perfect. It's already getting quieter after a week and a half. I guess it builds up quick when you just keep it in your pocket *shrugs*. Looking at it before she cleaned it, I couldn't even tell there was anything on it. That grill screen must be pretty dense.