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Best cell phone sim card solution for the USA? (Singapore)

Dear Fellow members,

what are my best options to have cell phone service when visiting the USA? Since our SG phones are unlocked we should be able to use a contract free pay as you go SIM card from the US.
Any suggestion what to get and where to get it?
Any idea how data transfer is handled/charged on this cards?
Travelling with an iPhone4.

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