I'm in Hyde Park, Chicago, and just got the iPhone 4 today. Before, on the 3GS, top down/upload speeds were about 200/30 KB/s. Testing out the iPhone 4, even when I only had about 2-3 bars of 3G, I consistently got over 300 KB/s download and over 120 KB/s upload speeds. Great thing I'm grandfathered into the old "unlimited" data plan! Would be awesome if the iphone 3 microsim works in the iPad 3G.