Hmmm . . . I have generally been very pleased with my Sprint PCS service, and I have used my phone in Oklahoma City, New York (all the way out to the tip of eastern Long Island), the Bay Area (well up into Alameda Cty), Chicago, Mpls-St Paul, Boston . . .
In all fairness it is my first cell phone so I have no frame of reference, but I have no home phone and use it a lot with no real complaints. I did have to use the customer-service line for the first time recently (to cancel Wireless Web, which I was never using) and waited on hold for a long time, but since it is a toll-free call, no big deal.