I'm hearing a constant background noise on the earpiece when talking to people. It's like a constant sssshhhhhhh or like changing the channel to a station you don't have and getting the "snow" (w/out digital cable box). It does not drown out the person talking but it's annoying. Decreasing the volume to half removes it somewhat but it's still there. To test this, I put the SIM in my old phone and called the same people and it did not have this noise. I've asked friends who have the iphone if they also get that and they don't. Any suggestions, tips, and/or advice? Update: it sounds crystal clear when outside or there is some background noise going on in the environment that I'm in. But when in a quiet room the noise is there.