IPhone to iPhone 3G upgrade, sim card installation?

when upgrading to iPhone 3G do i need a new sim card? will they supply me a new one? do i need to upgrade to the spanking new $30 data plan or can i keep my own?

Answers:    Yes I suggest you use the investigational sim card and they will give you a new one.
Yes you stipulation to upgrade to the new data plan beside the 3g phone.
check out www.wireless.att.com/iphone for more details

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