540 cell sites received a long awaited upgrade from AT&T. The upgrade added 850 mhz support the existing network to increase the in-building coverage, and the capacity of the 3G network in several cities. Currently downtown Atlanta GA, and parts of Fulton, DeKalb, Cobb,Gwinnett, and Fayette counties have been upgrade. San Fransisco, and New York are next on AT&T's list for a similar service enhancement. AT&T has plans to upgrade several cities before the end of 2009.