Google Authenticator is an app for generating one-time authentication (TOTP) codes. The application is supported by Android phones, iPhone and BlackBerry, and can also work without an Internet connection.
To set up the Google Authenticator app on your mobile device:
Step 1. Download and install Google Authenticator application on your device from App Store or Google Play depending on your device model.
Step 2. Open Google Authenticator and click the ”+” icon. You will be offered to choose one of the options:
Make sure that your Google Authenticator app is synced correctly. The time on the mobile device and the computer must match exactly up to seconds.
The sync will only affect the internal time of your Google Authenticator app, and will not change your device’s Date & Time settings.
More detailed information about Google Authenticator click here.