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How can I use 2 factor gmail authentication in this situation?

I have a gmail account, a laptop and a phone. I use 2 factor authentication so that when i try to access gmail on the laptop, i verify my identity with the phone, and it allows me to login in.

Now let's say I am out, and only have the phone with me. How do I login?

Thank you in advance for replies. This has been troubling me for a while!

EDIT: I would just like to thank whoever migrated this from superuser. I did not know about this site and having looked at it, I now see this is a better place. Thanks!

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migrated from superuser.com Oct 11 '12 at 10:38

This question came from our site for computer enthusiasts and power users.

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I really don't understand the question. If you have your phone with you, you can simply switch to the Authenticator or SMS app, copy the code from there, then back into Google to login...? I do this all the time with just one phone. –  Phong Oct 12 '12 at 20:29
    
@Phong, If I have only the phone, and I login into gmail from the phone, how can i use 2-factor authentication with only 1 device? –  gecko Oct 13 '12 at 19:33
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Exactly the way I described it, which is exactly the way you would login on your computer. That's what I do all the time. –  Phong Oct 13 '12 at 23:41
    
@gecko Are you planning on marking an answer as correct or providing additional comments on what you don't understand? –  dmcgill50 Oct 29 '12 at 22:31
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2 Answers 2

From a verified device(laptop)
1. Login to https://accounts.google.com/Login.
2. Click on Security>2-step Verification>Edit
GA-Security-2-step verification-Edit
3. Click on Edit for your verified phone. You will see the following screen. Google Accounts - Security -Edit Verified Phone
4. You are now able to send codes via SMS or a Voice call to verify this phone. No real need to set up a Back Up phone unless you would like to.

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I don't understand what you mean. If I have only the phone with me, and I login from the phone, to which device does it send the verification? –  gecko Oct 13 '12 at 19:35
    
It sends you a text message that has a verification code. You can also choose a Voice Call. –  dmcgill50 Oct 15 '12 at 21:15
    
Was my response to your comment not helpful or did you find the answer you were looking for? Please give some feedback so that we mark this question as answered. Thanks! –  dmcgill50 Oct 23 '12 at 16:16
    
Thanks for reply. It doesn't answer the question as it's no longer 2 factor authentication... I guess the answer is that it can't be done without carrying 2 phones (using only a single phone would lose the 2 factor authentication) –  gecko Jan 3 '13 at 23:07
    
Two factor does not mean two devices. It means two of three types of authentication. In this scenario, you have entered a password on your phone's web browser. This is the first factor. The second factor is something that you have. The thing that you have is your phone. The assumption is that an attacker will have your password and not your phone, making the attack unsuccessful. If you would like to secure this further, have it call your home phone or a voicemail service and then retrieve the code from the VM that is left by Google's authentication service. Please let me know if this helps. –  dmcgill50 Apr 11 '13 at 18:15
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You can open it from mobile and when it asks for a code,you can select an option,like "Send code to backup phone". Then the code is sent to another phone number. For this, you have to add one more phone number while registering for two-step authentication..

img

Check this for more details.

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thanks, helpful answer –  gecko Oct 12 '12 at 11:57
    
@gecko Glad it helped :) –  Bhuvan Rikka 웃 Oct 12 '12 at 11:58
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