Using an unlocked AT&T iPhone 4 in the Chicago area. Many places have not completed the "refarming" effort of switching the 1700 MHz towers to 1900 MHz, so most

Using an unlocked AT&T iPhone 4 in the Chicago area. Many places have not completed the "refarming" effort of switching the 1700 MHz towers to 1900 MHz, so most of the time I am on Edge (2.5G). When I happen to be in an iPhone 4 compatible cell, the 3G is pretty solid, often 6mbit down, 2mbit up. Waiting for the 5S to upgrade - hoping the LTE and HSPA+ is good.