he's worried because, a while back, when many of the forum members here were still in grade school, the contract said that they had a right to terminate your contract if a certain percentage of your minutes were spent "roaming"
if you mostly roamed on another carrier's towers, you didn't get charged, but your regular carrier was charged. It was a novel idea at the time to constantly force your phone to roam so you could potentially get booted from your contract without paying the ETF because you were too "costly" of a customer because of all the roaming fees that they to pay because of you.
do a google search for iphone and vermont. I remember reading recently that AT&T recently bought a smaller regional carrier so they could provide iphone service for a small state. i'm pretty sure it was one of the original 13 colonies, because i was surprised that the state did not have AT&T coverage
good luck