The black bumper does do the trick but...

[falcon26]

I got the black apple bumper yesterday. And I hate to say it, but it does fix the antenna problem for me at least. I now have full bars and 3G most of the time. And at work now where before it was no bars and on E or no service, no its full bars and 3G. So what ever the problem is the bumper does solve it. Although you shouldn't have to buy a bumper to make your $600 iphone work properly.....shame on you apple!