If you set up 2-step verification using SMS text message or Voice call and also want to be able to generate codes using the Android, iPhone or a Blackberry, you can use the Google Authenticator app to receive codes even if you don’t have an Internet connection or mobile service.
To set this up, first you need to complete SMS/Voice setup. Then, go to the 2-step verification settings page and click on Android, Blackberry, or iPhone, and follow the directions for your type of phone explained below.
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