Sign in using backup codes Basics of backup codes If you lose your phones or otherwise can't receive codes via SMS, voice call, or Google Authenticator, you can use backup codes to sign in. These codes are available on your Accounts overview page and were first offered to you at the end of the 2-Step Verification setup. You can also use these codes to sign in if you don’t have your Security Key. The codes come in sets of 10, and you can generate a new set at any point, automatically making the old set inactive. In addition, after you’ve used a backup code to sign in, it will become inactive. We recommend you store your codes wherever you keep your other valuable items. Like the codes on your phone, backup codes are only valuable to someone if they manage to also steal your password. For more information, please go here: support.google.com/accounts/answer/1187538?hl=en
