What type of phone do you have?  I would check with Verizon.  They used to have a limit on the charges.  You would be charged so much per 411 call until you reached a certain total then they would be free till the next billing cycle.  I personally have a smart phone and use either google or I have a white/yellow pages app for that. I have found it is also highly useful to keep the destination campground number as you can call them and they are usually glad to dig up a number for you.