iPhone anti-interference shield puts an end to buzzing speakers {Engadget Mobile}

Jul 22nd 2008 12:59AM Well I just got my iPhone3G and all i can say is that it makes a HELL of a lot more noise then my 3G Blackjack ever made, which was also with AT&T. Personally, I think there is some kind of design flaw in these iPhones. I mean the Blackjack occasionally made a bit of noise, but for the most part I could leave it sitting on my desk and no problem. With my iphone I have to get up and get about 8 feet away from my desk for the noises to stop. I have noticed its a lot worse when I have turned off 3G (to save battery). So something about edge must be worse.

This guy seems to think this will help, I haven't tried it: http://www.50leaves.com/apple/apple-hardware/how-to-stop-iphone-interferance-in-speakers/