I came from the Treo 650 and that vision plan is incompatible with the TP. The TP needs a "Power" vision plan so that is why you are being charged for the data used. You can move up to the standard $15 power vison plan that will give you unlimited data access.

Here's a good link to all the Power Vision plans and what's included:
http://www.sprintusers.com/forum/sho...d.php?t=110534