I just returned from trying out an iPhone4 at my local AT&T store. I made sure wifi was off so it was only using the 3G network. I did not make any calls -- only opened various web pages. I held the phone many different ways. I put my finger across the gaps in the frame. I held it tightly in my hand and wrapped my hand / fingers around it as much as possible. In all these cases, the web pages loaded quickly and I saw little to no difference in the bars (saw it decrease by 1 bar once). I went to some obscure web pages to be sure it was not reloading pages already loaded. I had 4 bars in almost all my tests. I was pleasantly surprised I could not get the signal to drop or pages to load slowly when I held the phone covering the gaps in the frame. I don't know how far the cell tower is from the store -- would assume it is fairly close with the strong signal. I will continue to test this at different AT&T stores as I wait to purchase my iPhone4. I believe the people who are having problems, but I could not replicate them. Maybe this is a quality control issue with something different / wrong in the production of some units. I will post as I re-test this at different AT&T stores.