What has everyone's experience with data been like downtown? Here's my backstory- I got the i4 Friday morning. My office is at Madison and Clark. I had 5 bars and the 3G icon was on. Data was beyond slow. Couldn't even get the app store to load. Emails took minutes to load rather than seconds, safari was useless. Went back to ATT store, they tried swapping the sim card, still no luck. Took the el home to Lakeview, and as I'm riding, suddenly my i4 is in hyperdrive. Everything is lightning fast. I downloaded like 8 apps just on my 20 minute train ride. email, FB, and everything worked great. Same thing all weekend, so I chalked up Friday's peformance to a fluke. Get to work this morning and back to square 1. Super slow email. Speed Test app can't even identify a server. Still show 5 bars and 3G connection though. I upgraded from a 2G iPhone, so I don't have any experience with the 3G network. Is it just worthless in the Loop or is something wrong with my phone? The guys at ATT said I could exchange (once they have more in stock). Just wondering if that is the problem or if it's something else. Thanks!