Surprised I haven't seen anyone mention this on here, or other blogs online. Chicago Loop, and areas in at least a 3-5 mile radius around it have incredibly slow data speeds. I moved here with At&T and replaced that iphone with a Sprint one. The At&T one gave me either incredibly slow or no data access in Chicago. Sprint is a smidgen better, but not by much. I went to the Apple store on Michigan Ave today and tested all 3 carrier iphones side by side with wifi off. None of them could barely open any web pages over 3g. Crazy. I guess it's just too dense here, with too many tall buildings...similar to the atrocious coverage in Manhattan. Any thought/suggestions?