We had huge issues with Verizon in the A2/Ypsi area. And their customer service sucked ... seems like I was always on the phone with them getting nowhere. We had spots here around the house and out and about where we CONSTANTLY dropped calls. At a time of upgrade I called Verizon and listed features I wanted on a new phone for my daughter's line. They recommended a phone I accepted. I got the phone and it didn't work with the particular service I had requested. They REFUSED to switch it for a different one. The entire reason (at the time) my daughter had a phone ... and we couldn't use it. We paid out of our contracts shortly after that and switched.
We switched to Sprint (who I had, had in the past for a 6 year span), we've had some issues, but all were quickly resolved by customer service. We haven't had too many dropped calls. There are a couple spots around here with weak signal, but not to bad. Plus, we get a discount through Phee's work.
I also have AT&T. Our house is an AT&T black hole. Voice services don't work well here. Although data does. I had a first generation iPhone, I thought AT&T sucked for the longest time because I could barely use the voice portion. Come to find out it was my iPhone. I recently upgraded (contract was up) to a BlackBerry Bold, and haven't had the same issues. Although I have had bad issues with their customer service. Took the BlackBerry into AT&T, the sales guy looked at it and said "it's broke" and handed it back to me. Refused to send it to tech. I took it back to Best Buy, where they called BlackBerry and found out it was a bad port in their outgoing server ... fixed it and it's worked really well ever since.