This probably goes without saying since you presumably just read this article, but I always tell people to actually check the website like they're trying to buy service before moving somewhere new. This is a particularly important for me personally because I have a slightly-petty personal vendetta against Comcast, so I'll only live somewhere that has Verizon FiOS (or a comparable fiber provider).

Even this method can be flawed - there might be a hefty installation fee, or you might run into a situation where even though service is technically offered at your new place but it's not physically possible to install. My mom and I ran into the latter situation years ago when she moved into a new house during a FiOS installer strike. They scheduled installations weekly for a month or two, optimistically thinking they'd reach an agreement I suppose, but nobody ever showed up. We eventually had to sign up with Comcast, which sort of got us through a few months until it was possible to get FiOS installed.