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Don't know how far the 5g rollout is, but in Vienna, Austria we have full 4g in all subway lines and stations since 2018. No need for wifi.

Well, Moscow had signal carrying cables in the metro for years. Full coverage since 2018: https://www.expresstorussia.com/news/the-moscow-metro-now-ha...

I have always been confused how some countries have such bad coverage. Before Wi-Fi Calling, it was a nightmare to be inside any apartment building I've been to.

Sweden

I remember marvelling at the full mobile phone coverage in the Stockholm underground network 20 years ago. London's tube will manage it any year now, I'm sure...

Korea

Probably Monaco or the Vatican (though none have a subway).

Because in a real country you always have blind spots, even in relatively easier points such as the Netherlands (flat and populated)

The Vatican sort of has a subway. It has a single train station, which has (rare) passenger service, and about 100m of train tunnel.

Ah, I had no idea! Thanks for sharing that. For reference, the Wikipedia article: https://en.wikipedia.org/wiki/Vatican_Railway

similarly Monaco doesn't have a subway, but their train station is in a tunnel so I think that would probably count in this instance: https://en.wikipedia.org/wiki/Monaco-Monte-Carlo_station