I work in a 36 story high rise office building in Los Angeles. On my AT&T iPhone 4 (or all of them for that matter) I would have to finish my call before getting in the elevator. On my new Verizon iPhone 4, I get 4 bars all the way up! This makes me very happy! I know, data speeds are slower. But so far, I haven't noticed a difference. Not so sure data speeds on AT&T were any faster in my area cause Verizon still seems to be the same for me.