AT&T Factory Unlock with Straight Talk?

I just bought an AT & T iPhone 3G that has been factory unlocked and was wondering what kind of SIM card I need to use with Straight Talk. I have a standard SIM in my old Straight Talk phone, but I've heard that you have to order a certain kind of SIM from Straight Talk's website. Does anybody know about this, and is it true that, despite the phone being factory unlocked, you have to actually jailbreak it to use Internet/MMS?

If the 3g iphone is unlocked, just buy the tmobile straight talk sim and pop it in.
if its locked you will need the att straight talk sim, you can find them on ebay since straight talk no longer sell them.

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