Read this: Why does the London Underground still not have Wi-Fi in tunnels?
Summary: Advertisement But why does London have much worse connectivity than most other public transport systems below ground And why is there zero phone connectivity Take Moscow's Metro, where both Wi-Fi and mobile phone network have been available since 2014. These signals work in line of sight, and that's doable because tunnels in Moscow are wider and straighter than those in London. - www.wired.co.uk
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