Hm, the point of authenticator is to not use the phone, because phjone numbers may be more vulnerable. wasn't there a case of social hacking where the telco forwarded to hacker's phone?
That was a case of them circumventing the 2FA he had, they just granted access.
Authenticator is a mobile phone app, how are you supposed not to use your phone with it?
You could set it up on a tablet.
Which are still quite a bit rarer than smartphones. Plus it makes your password way less portable.
I measnt not use the phone network, because the SMS could be diverted.