Howdy, first post here... ...I have a 3GS and work in downtown San Francisco and AT&T's signal is atrocious. Starting around 9am, the signal begins to switch back and forth from 3G to Edge, and around lunchtime I often get the No Signal message. I am considering switching to Verizon or Sprint for the 4S, but am grandfathered in at AT&T under unlimited data. Am wondering if anyone thinks the new antenna design in the 4S will help AT&T's signal.