Tony,
I still havent' figured out how much it cost! LOL
I'm told that Broadband Access Connect for my phone (BBAC) is a monthly cost of $60. The customer service rep said as soon as I turn BBAC on, I will be charged $60 for one month. I can turn it off and not be charged for the next month.
I know people who have been using this feature for a long time (well 1 year is a long time in this industry!) and say that they turn it on and off all the time and are charged a prorated amount, about $2/day.
I've had the service since January and have only used it a few days in January and a few days in April. I can't find a charge of any kind on my bill!
It may have something to do with when your contract was made. We've been Verizon customers since 2003.
So ... worse case = $60 month by month. Best case = Free! Prorated to $2/day sounds good to me.