Can you recommend a mobile phone solution for a visitor?

Posted by BonnieMcMurray@reddit | AskUK | View on Reddit | 8 comments

I'm flying from the US to the UK in a few weeks and also spending some time in France. I haven't been back in over a decade, so...what's the mobile situation these days? Can you recommend a method of getting one month of phone service that will also work in France and, hopefully, not break the bank? I have an unlocked GSM phone. But if possible I'd prefer a separate phone rather than just a SIM card. But if that's gonna be stupidly pricey, SIM will do. I'll just have to tell my boss that I'll be 100% unavailable. (Oh no, what a shame!)