I have Verizon with a corporate discount. The call quality is the best I've ever had, no drop calls. The problem I have is keeping 3g and 4g inside some buildings including at work. I have no wifi at work and I barely get 3g signal. Co-workers of mine get perfect 3g with at&t though...I live in Miami so I don't know if Verizon is good here or what? Is it that gsm is better than cdma inside of buildings?