ATT iphone 3gs. Total failure to make or take calls until Sunday. I arrived Tuesday morning. Txt was about 50% success? I had to keep hitting "try again". Wifi was nonexistent where I camp, all the way out at 2nd and Lindbergh, but I expected that. I'd rather have no wifi but also no noise from the party crowd at night. wifi connectivity inside the airshow was spotty, but I assume that's because the crappy ios and apps try 3g and lock up, so wifi might have been ok but ATT sucked. I'll agree with the other posters, wifi only works after you try a web browser, and get the web login page. I have to zoom in to see the "agree" button. Maybe you have two pages there, redirecting mobile users to a version with a gigantic set of buttons that are usable on an iphone etc?
After the last few years, I basically gave up on phone service during Airventure. I was hoping txt would work better.
ATT's answer to crappy network complaints is to sell customers femtocells and charge them for using their internet connection, so I'm not surprised they fell completely flat during Airventure. Just waiting for my contract to run out then I'm back to Verizon and a new iphone 4.