I started a thread a few days ago about these slow/sporadic 3G speeds on the iPhone 4: http://forums.macrumors.com/showthread.php?p=10418000#post10418000 A user, amirdieselx64, posted in the thread, saying that this issue on his iPhone 4 has been resolved after he spoke to at AT&T rep. The following was his post: "I called AT&T and they were able to fix my 3G from being soo slow by readying the network information the phone uses to find cell towers. They said that the day of activation the towers were overloaded and the phones probably didn't get updated cell tower info. The csr sent a hit to my phone and reset it. I turned it off and back on and my 3G was blazing fast. Anyone else out there with a slow 3G iPhone 4 maybe you should try that as it worked for me." So it seems as if the AT&T rep needs to "ready the network information that the phone uses to find cell towers," or update the phone with the latest cell tower info, in order to fix the issue. In his case, the rep "sent a hit" to his phone, and after he reset it, the issue was resolved. Can anyone else confirm having done this? I will be calling AT&T tomorrow to suggest this and will certainly post back here, but if anyone has already had any experience with this, please do let us know.