Also what is the ratio of dropped calls to calls made?
With all due respect, I don't see how that is even relevant. If one dropped call to 911 ended in tragedy, it is alarming. I understand the provider is under no obligation to guarantee 911 service in any particular area, but that is the one service we should be able to depend on. The #1 reason I have a cell phone is in case of an emergency. Obviously I enjoy the other capabilities it gives me, but if the only thing you could use a cell phone for was to call 911, I would still get one for my wife. I have a feeling the majority of (mature) people with cell phones feel the same way.
"Regardless of the legal speed limit, your Buick must be operated at speeds faster than 85 MPH (140kph)." -- 1987 Buick Grand National owners manual.