Yesterday (Saturday) my iphone was acting really buggy. I normally have full bars of 3g service but it would say "no service". I did all of the normal tricks: turning phone on/off, reseting network settings, turning airplane mode on/off and none of it worked. I only got my phone to start working again by plugging it into my computer. Also, when I finally did get service, my calls wouldn't go through and when people tried to call me it went straight to voice mail. I live in Ann Arbor and during football games I usually can't make calls because there are so many people using the AT&T tower. However, the thing that really bothers me is that my friend who has AT&T was able to make calls when I couldn't. My iphone works fine now, but it's a major pain to have to go through this every Saturday (when there is a home football game at least). Think is warrants going to the genius bar? What do people think it is?