HTC One X AT&T PreOrder...

I'm having problem pre-ordering this item thru AT&T. I'm upgrading a line (wife's), but somehow I could not checkout and proceed with the purchase unless I pick a DATA plan. The phone I'm upgrading already have a data, so I'm not sure why it's asking me to pick a DATA plan.

Anyone else having this kind of problem, and how do I go about doing this besides calling/or going to the AT&T store?

Thank you.