Seattle has a lot of dead spots on AT&T & T-Mobile and Verizon's EVDO network (last time I checked about a year ago) had a lot of dead spots as well (their EVDO is on a different band from the voice). Sprint's customer service has historically been terrible but their data network is really good, I've used them for EVDO for twoish years and usually get at least 1.5Mbps down / 500Kbps up wherever I am.