Cell Phone Plans

Can anyone who lives in the Manhattan area, or at least frequently goes into the city, tell me anything about Verizon’s service in subway tunnels? I’m considering switching my service, and I’d like to get something that does work in the tunnels (I know pretty much nothing works on the train, but lots of phones seem to work in the underground labyrinth). Or if you don’t use Verizon, but you do use one that’s really great, I’d like to hear about that too. The only reason I mention Verizon by name is that I’m thinking about getting one of their phones: the Verizon Wireless XV6700. Tobias Buckell has one; he showed it to me at Worldcon and I’ve been wanting one since.