Here's a decent article on the topic: https://www.wired.co.uk/article/london-undeground-wi-fi
When I was living in Asia, even in poorer countries and/or rural areas, there was mobile internet. $1/mo for 4G 1GB. People took it for granted at a level that would be impossible in Germany, because here you can still be without even 3G just a few km outside of city centers.
Also, mobile internet repeaters for tunnels are a solved problem. Singapore had no offline areas in their underground metro. Germany has lots of em.
True. Unfortunately in Canada (Toronto at least) the big 4 telco oligopoly can't agree on pricing for this one. The result is a single company offers subway coverage!
Nevermind that data here is more expensive than even the US.
Where's that Silicon Valley disruption spirit for the telco oligopolies worldwide?