I have been on the original AT&T Unlimited data plan for the iPad from day one. Does anyone know if I will be able to transfer that plan to an iPad2?
Yes you can, but do not do what the above poster advised. Just swapping out the sim card could cause your plan to be cancelled. AppAdvice contacted AT&T and just posted a how to on how to do this. Here is the link.
How-To: Transferring Your iPad’s Data Plan To iPad 2 :: App Advice