Read his post here and his post on the related thread:

http://www.flyertalk.com/forum/trave...intl-data.html

He starts this one by saying: "I have a same old grandfathered at&t plan unlimited data." If he has it, he doesn't need the data bucket that that he is talking about. I am not sure if he actually is grandfathered on a domestic unlimited package and is afraid of losing it. Alternatively, I'm wondering if he is thinking doing some tethering. I think he needs to clarify what is going on.