I just got a heads up and I thought all the Vanagon owners also want to know it, that the cell phones are going public tomorrow and of course when those unwanted calls from sales agents come in, you would have to pay for the call.  
But there is a way to stop it.  You would have to call the Do Not Call number 1-888-382-1222 or go to donotcall.com and register your number automatically, but only when you call on that phone.  So, you must use the phone to call the do not call number with the phone you want to register against unwanted sales calls.  
I would not want a Vanagon guy be upset for unwanted calls and also pay for it.
Zoltan