In Cincinnati Ohio, Sprint is on the border of sucking. They used to be REALLY bad, but they are getting a lot better, particularly in metro Cinci. The 'burbs still suck. I don't know too too mcuh about dropped calls, but my friends that live downtown don't complain much.
I have an Ericson T18LX with digital data cable (MMMMMMM) on ATT Wireless (well CinciBell Wireless, member ATT wireless network)... I pay $29.99 for 200 peak/unlimited off peak (8pm-6am + all weekend) for local airtime. I have to pay for roaming even in ATT wireless cities, but I rarely travel so I don't care too much.
The ATT wireless service (TDMA1900) is damn near perfect - like inside elevators inside buildings. GTE Wireless (CDMA1900) is pretty damn good too. Verizon (CDMA800) are pretty decent too, service wide. Verizon will always try to stick you up your bootyhole on the contracts. Very nasty.
As for phones, both the Samsung 3500 and 8500 rule. Great battery life, great reception, easy to use. My sister's boyfriend has one and he loves it.