Until you get your phone back or can set up Code Generator on a new phone, you can save a batch of backup codes as described above.
So, don't let it get that far.
Why Do You Need a Facebook Confirmation Code? In cases like that, you can only hope that Facebook will help you recover your account.
This will log you out of the app.
The tool will come in handy when you're traveling or don't have mobile reception.
Let Facebook Text You a Confirmation Code Do you still have access to the mobile phone number you defined under two-factor authentication? If in doubt, end multiple sessions.