Uk Mobile Vodafone with an American Pay as you go sim?

I will be going on holiday to america in 5 days for 3 weeks. I currently have a Vodafone Iphone 5 and I want to take it with me but I'm a little scared about the bills I may rack up on the internet whilst using. I was wondering if I take my contract sim out in the UK and then buy a Vodafone pay as you go sim in america and top it up so that I'm able to use the internet. Would this work?

You have to unlock it first.

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