I know that signing up with the treo data plan for verizon costs $$$

I also know that dialing in to the express network (xxxxxxxxxx@vzw.net) through your computer (connected to phone with cable) uses minutes but not data charge.

Does activating the express data network on a treo 600 cost for data or for minutes?

also, what is the cost per month for data? (it is $5 for a non pda phone)