Okay, well here in my house, we have an iPhone 4 with iOS 4.0.1 and an iPhone 3G with iOS 4.0.0. The software update, in my understanding, more accurately depicts signal strength in the respect that the 5th bar now covers a whole lot less range... leaving the lower bars relatively the same. (judging by a recent graphic on the rumor site) Now, when the iPhone 3G was updated from iPhone OS 3.x.x to iOS 4.0, it was around then I feel that a drop in signal occurred. I used to have full bars, then only reported a consistent 3 or 4, if lucky. Judging by this, I feel that perhaps this was a coincidence and maybe for some reason the At&t coverage in my area took a drop. My friend on Spring also noted a month ago or so he began receiving a much weaker signal, so maybe the towers in my area for everyone are screwing up for some reason. If the towers are not the case, though.. then I have no choice but to blame the iOS software, not the iPhone antenna. As SJ put it today a few hours ago, ALL phones suffer from signal attenuation and I fully support that. But the fact that the iPhone 3G started reporting lower bars BEFORE the iOS 4.0.1 update (which theoretically will give people a less 'optimistic' reading) makes me wonder if the iOS 4.x.x software right now itself is hurting signal, but I feel if this were a widespread issue then Apple would know about the software being buggy right now, which leads me to believe my coverage just took a beating for some reason because I don't feel many reported worse signal strength after the iOS 4.0.0 update. So I don't know how to make sense of this... I really think that the new software is causing the issues and for the experimental reasons I listed above, and that the iPhone 4 itself only has the major issue of the proximity sensor flaw. Thoughts?