I don’t know anybody who would both appreciate the fax number of the beast joke and not turn it into a conversation about 617 being the real fax number of the beast according to most manuscripts.

Yeah, but using 616 is problematic because it ruins the Barney is the antichrist bit [1], and we wouldn't want to associate NANPA area code 616 with both the beast and Grand Rapids, MI (historically, 616 covered more of western MI)

[1] https://www.christadelphianbooks.org/agora/bible_books/jff01...