I specifically trying to do exactly what is described in this thread. therefore I posted in this thread instead of repeating the same question in new thread. not sure what I could add:
Having the phone number as a fallback really kills the added security that an authentication app offers. I would like to remove my phone number as a backup, and instead have one time codes if I need them. Is there any way to do this?
After recent cyber attacks on telecommunication even FBI warned to stop using SMS. As others have already pointed out in this thread you can only increase security if phone number is removed from 2FA in favor of authenticator app.
