True, but China seems to have better mobile coverage than the US, and they have 4x the number of people and about the same number of mobile users. That said, they probably don't have the same concerns about zoning and "not in my backyard" syndrome that we get in the US (if they want to put up a cell tower, they'll just go ahead and do it).
Yup, thats for sure one reason. Its also incredibly spread out and in the country (and they mean country) you got nothing at all. In Hong Kong they got femto cells every two floors, connected to fiber, same then in Seoul, S.Korea, they got cell coverage with 21Mbs in the subway! Seriously, they stream TV under ground, mind boggling.
Put that in contrast with the protests in NYC (the finacial capital of the WORLD) where you have protests when a PAGER network gets shut down. Remember? pagers?......