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FTA:

You can install a standalone app called Google Authenticator (it’s also available in the App Store), so your cell phone doesn’t need a signal.

Also:

You can print out a small piece of paper with 10 one-time rescue codes and put that in your wallet. Use those one-time codes to log in even without your phone.

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Hm, can you generate new codes whenever you need to? It might be cool to use these 10 at a time as a one-time pad.

Yes, you can revoke those printed codes or issue more whenever you like.

You can create a new set whenever you want. However, generating a new set invalidates the previous set (so you can revoke access with those tokens if they are lost.

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