Google two-step authentication and Android lock screen After many failed screen unlock attempts, the user is required to enter the Google account password. That's a good idea.

But what if I enabled Google's two-factor authentication, and then entered the wrong pin/pattern/password two many times? How do I unlock my phone now? How do I login to Google on another machine, when my phone is locked and I can't receive SMSs?

Is there anything very obvious I'm missing? Am I supposed to carry a printed version of Android's application-specific password in my wallet?
You would have to use your emergency backup codes you should have printed out: Backup Code Page.

These are one-time use codes that Google recommends you print for emergencies to access your Google account to unlock your phone.

Additional Information for methods of gaining account access.