I'll add my anecdote: last year I took a long bus journey two ways between Hamilton, Ontario and the Philadelphia area. At one of the transfer stops, Binghamton NY I think, I picked up a 14GB SIM card and activated it in my phone, and it had signal almost the whole way to Philadelphia, I was watching videos the whole way, and made two video calls. Population density on the east is higher, but it's not that high, cutting through Pennsylvania.