UK is probably the cheapest market relative to GDP per capita. Three offers unlimited data, calls, texts and roaming with no throttling including 5G for £17/month.
Actual competition is a hell of a thing. I'm pretty sure there are some backroom price fixing agreements between the Swedish operators, the profit margins wouldn't hover around 30-40% if there wasn't.
There were some dawn raids on these companies last year by EU antitrust authorities, but they didn't find any actionable evidence. :/
But the prices in e.g France, eastern Europe and Taiwan all put us to shame.