I have a GoPhone and I brought it to work with me for the first time yesterday. Reception in my office (ground floor, near a window) fluctuates between 0-1 bars to no service. Sprint is perfect in my office (second image). Now compare their coverage maps: My office is blanketed in the "best coverage" AT&T has to offer (first image). Yet my phone (thankfully prepaid) is practically unusable. At least at home (the second green image), where Sprint is bad and AT&T is good, Sprint's coverage map has me indicated as being in a marginal coverage area. And no, that pushpin isn't exactly my home...I am semi-concealing the location. But it is in the light green area.