IPhone 4 with Straight Talk? - 1

Okay so right now I have a different straight talk phone; lets call it phone A. I would like to buy an iPhone 4 (lets call it phone B) from somebody. If I take my sim card from phone A, and put it in Phone B, then connect the iPhone to iTunes, will it work?
Do I have to "unlock it?"

If you want to use a Iphone with Straight Talk it will need to be unlocked. Then you will need to change the APN settings on your Iphone to what Straight Talk has listed on their website.

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