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It's not a 5 second hassle. I don't get a cell signal in the steel gymnasium even though the wifi works fine. I physically have to go outside to get a code every time I want to log in. And then if my phone is not working, or I leave it at home, I'm screwed.

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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.

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.

That's a fairly special case though right? The most common concern I hear (other than it's just too complicated) is privacy concerns. People are asking "why does Google want my cell"? What else is that number used for?

Leaving my phone home, or just having a dead battery, is not really a special case for me :)

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