So what happens if Face ID or Touch ID stops working for you, for some reason? I've never had it happen with Face ID, but it has happened with Touch ID (especia

So what happens if Face ID or Touch ID stops working for you, for some reason? I've never had it happen with Face ID, but it has happened with Touch ID (especially in winter months when skin on fingers gets dry). Does that mean you simply cannot change these settings or access these features? One could imagine a disfiguring accident (or even just recovery from a cosmetic operation) rendering Face ID inoperable.