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Can't speak for international, but I've been with Three a few years now. Great speeds on 4G and 3G but patchy coverage, even in London. I get no signal in my house in London, called them and they gave me a signal booster to hook up to broadband.
If you can live with occasionally having no signal (for now, anyway - presumably they'll be jumping on o2's 2G and 3G network soon as well?) then you can't really beat them for price or performance.
How do people find Three. Decent speeds/coverage?
How is the international service, particularly in the US?