> so long as you can convince your phone company that you are you you're fine. Well I think the problem starts when someone else convinces your phone company t

> so long as you can convince your phone company that you are you you're fine. Well I think the problem starts when someone else convinces your phone company that they are you. As we've seen several times now it becomes easier and easier to pull this trick. As for U2F add more than one to your account (2 is minimum) and you are safe. The same applies to any kind of physical key (home, car, etc.)