Treo 650 Wifi

I know this is probably going to be a really n00b question but when you use a wifi adapter on the treo 650, do you get billed for the data usage and web browsing? Or is it free because your connecting to a wireless internet connection ? .. Also if some of you out there own a 650, what kind of adapter do you have, and how well does it work ? (range, reception, etc)

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All you need to get is the Data plan, and your charged by the ammount of data transfered according to your plan.

I think cingular's starts off at 19.99, upwards of 29.99 for the unlimited.