I have verizon, and have had it for almost 2 yrs now....
I also spend alot of time north of concord............................
Camping in the summer, snowbording in the winter ..
pretty much all service plans have limited access N. of concord.... I have found that I usually have service when the people i travel with don't.......
But again the service is very blotchy up north and cervice is not gauranteed.....