Google recently updated Google Authenticator to version 2.15.
What's in this version:
1. New entry for Google Play, same great app
2. Updated look and feel
3. "Scan barcode" and "Manually add account" options moved to Menu > Add account.
When your phone is not connected to any network, Google Authenticator can be used to generate a valid verification code.
The verification code generated is then used in Google's
2-step verification process when signing in from a new device or phone.
Please visit this
site for more info.
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