Another update: I called Frontier, and after fighting with their phone system, I spoke with someone with a thick accent (clearly outsourced customer support). Since I don't have a Frontier account, half the battle was just getting someone to talk to me. Eventually they transferred me to a "technical support" person. When I mentioned that the box had "AT&T" on it, I was told that I need to talk with AT&T. They gave me the main AT&T number. Since I don't have an account there, I had yet another battle trying to get to a human. The lady I spoke with (also with a thick accent) directed me to a technical support phone number. Or not. When I called, I realized that the number was the main Consumer Cellular phone number.

This is crazy. My next path is probably through PURA. I'm close to getting a ladder, going out to the pole, and cutting the sucker off myself.