I set up Google 2-factor authentication for some of my accounts. Some useful pointers:

  • Add another phone to the list Google will call: https://accounts.google.com/b/0/SmsAuthSettings#devices
  • Assign a password for an app on a device: https://accounts.google.com/b/0/SmsAuthSettings#asps
  • Show/edit computers that 2-factor authentication knows as yours: https://accounts.google.com/b/0/SmsAuthSettings#registered
  • Print/display offline/backup 2-factor codes for when you don’t have phone service: https://accounts.google.com/b/0/SmsAuthSettings#registered