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Coverage is an issue underground, but plans are cheap now, at least in the UK.

I think my phone plan costs me something like £12 per month and I get more data than I ever use from my phone (30GB), and unlimited minutes/texts.

Counterpoint: I pay 10€/mo for 2GB and no minutes/texts included in Germany

Which network is it?

O2

4G will be available across the tube by 2021, even in tunnels. They need an interesting type of antenna [0], basically a long wire running along the tunnel that 'leaks' radio signals, because 4G won't propagate down tunnels. The mayor is trying to take credit for it but it's actually supporting the new Emergency Services Network: an over ambitious plan to replace all police and emergency radios with 4G devices.

[0] https://eandt.theiet.org/content/articles/2019/01/online-und...

I'm thinking the same thing. Living in Sweden.

But - WiFi is very good when you are travelling outside of your data plans coverage area.