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.
Serving coffee on aircraft causes turbulence.