What are my options when wanting to use an iPhone in the USA for 3 months?

I'm spending the summer in the US, I can't really find a decent plan that I could use my phone over there. I'd mostly need it for calling home in the UK as well as contacting people in the us and maybe some light google mapping - I'd try to keep that to a minimal/ use Wi-Fi spots.
In the UK I pay £30 a month for unlimited texts, 660 minutes and 1gb of internet, any similar deals for roughly the same price?

Hmm most of the big carriers here are based on contracts. There are some smaller carriers that I believe offer pay as you go services like virgin mobile. Also Tmobile offers no contract and since you already have the phone you may be able to use them for a few months. Imessage is always free even internationally and lots of places here have free Wi-Fi (panera bread, mcdonalds, etc, many restarants and bars… )

Unlocked phone and this is your multiple choice http://www.usasims.com

DO NOT PUT YOUR UK SIM CARD IN YOUR PHONE WHILST IN THE US…
Unless you are actually holding a winning ticket for a State lottery.

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