Multi-Factor authentication is great. There is only one downside: you lose your phone. The way to deal with that is to have a backup. To set that up, either read this if you use Microsoft’s authenticator: Back up and recover account credentials in the Authenticator app from Microsoft Support or this if you use something else for authentication: Make Sure You Have a Backup for Two-Factor Authentication.
Smart People I Know 
Unfortunately, I have run into a number of companies, including financial institutions, that only support SMS for verification, and only allow a single cellphone to be registered. Even if the phone is not lost, this can be an issue when travelling or in an area with bad reception. We can all help by expressing our concerns to companies that have weak or brittle MFA systems – we should be encouraging people to use MFA.
That’s a good point! There’s still a way to go before we get good MFA adoption. I mean some banks still use “answer 3 questions”