> 2. Cell service has, at the same time, become ubiquitous in subway tunnels.
Not in New York, unfortunately. All of the stations have cell service, and one tunnel (14th Street L train tunnel under the East River), but everywhere else has no service between stations. It’s an annoying limitation that most cities seem to have fixed by now.
If I rode there I'd consider that a feature, not a limitation.
No one talks on phones anymore anyway. But having data would be nice.