Northwest Chicago suburb here and have less 2 bars or less all day. We have to call and get tickets into AT&T so their tech team gets on this ASAP. When I shut off 3G I am getting full signal. I was told by AT&T that I have multiple towers around me that are 3G enabled and I should have the same signal with Edge as I do with 3G. I am hoping this is just cause of all the new phones going to these towers all at once, and that this issue will be resolved QUICKLY.
Just a thought-this happened to me with my 1st iPhone and I called AT&T. They resent signals to me a few times and then the reception greatly improved.
Also, some of you with v1 may remember the piece of scotch tape on the sim card thing, it sounds crazy but it actually worked,yes a small piece of scotch tape attached to sim card.
This shouldn't discourage anyone from buying an iPhone, like I said, AT&T resent me some signals to strengthen my phone signal. I had the problem the first few days I had my phone but never again and that was a year ago.
3-5 bars varying over the past few hours here in Brandon FL (Eastern Tampa). Limited 3G signal (1 bar) but Edge is almost full strength. I'm going to do some more testing closer to downtown (Ybor, Channelside, S. Tampa) over the weekend.
Keep in mind that a "bar" is a relative measurement for each phone, not an absolute measurement. A 1 bar signal on one phone could be a 5 bar signal on another phone. I have no idea how the iPhone 3G compares to the iPhone in terms of absolute signal strength. But even on 1 bar 3G it seems to be getting a clear signal with good voice and data.