To keep your Vault safe from account attacks, we recommend the authenticator app as your authentication factor when logging in. If your password is compromised, you'll have peace of mind knowing that only you can sign in.
We recommend using an authenticator app for increased security without the need of sending text messages.
Receiving codes via SMS is less secure than using an authentication app. A hacker could intercept a text message or hijack your phone number by convincing your carrier to transfer it to another device. Or if you sync text messages with your computer, a hacker could gain access to SMS codes by stealing your computer.
Visit The authenticator app to learn all you need to know about using and setting up an authenticator app.