Get verification codes with Google Authenticator The Google Authenticator app can generate one-time verification codes for sites and apps that support Authenticator app 2-Step Verification If you set up 2-Step Verification, you can use the Google Authenticator app to generate codes to sign in to your Google Account You can still generate codes without an internet connection or mobile service
Fix common issues with 2-Step Verification - Google Help An app doesn’t work after you turn on 2-Step Verification When you turn on 2-Step Verification, you may need to sign in to some apps again Tip: If you can’t sign in to an app after you add 2-Step Verification, you may need to use an App Password Why you shouldn’t use Google Voice to get verification codes