I use Sprint PCS Vision almost every day and when I get the car computer every hour of every day
I signed up for it and the sales rep said the PCS Vision is unlimited and does not count against your minutes. Even if its attached to a laptop using their connection software. PCS vision doesn't dial a number on my Setup it just connects and its a rather fast connection too 5+k/sec on my .zip downloads. Call up sprint they will tell you that the addition of PCS vision to your plan will empower you to unlimited internet as long as your cell phone battery can hold out
I did a road trip with my tablet PC that was 200 miles and was online the entire time talking on instant messenger and surfing e-bay without a problem. Just call sprint if you want to know more about it.