Google Authenticator is a free app for Android that lets you use two-step verification codes to protect your account from unauthorized access. Once you've set it up, you'll need a code generated by Google Authenticator to log into your Google account.
You can download Google Authenticator from the Google Play store. The app will generate codes in airplane mode, and it supports multiple Google accounts and multiple languages.
Google Authenticator is proving quite popular among Google users and as I write this has a 4.5 star rating from more than 56,834 users. So it's clear that it has a lot to offer Google users that are concerned about the security of their accounts.
Additional resources for Google Authenticator
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