IPhone 4 to StraightTalk

I'm trading in my HTC Inspire 4G for an iPhone 4. I currently use StraightTalk as my carrier, and would like to do the same with the iPhone. But I don't know what all I would need to do that. Do I need to purchase a sims card from StraightTalk? And would the iPhone need to be unlocked? I'm totally clueless!

You have the option to buy the iphone 4 from Straight Talk and transfer your number into it or buy an unlocked iphone 4 and a compatible SIM, then transfer your number.

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