When we moved, they told us we could hook up straight away. Then they said - oops, sorry, there's already a Verizon account at that address.
So we had to prove we owned the house before they'd activate us. Apparently, the previous owners hadn't bothered to tell them they'd left, and also took the ONT with them. It's all fixed now but we got charged for the set-up, which should have been there already.