With the Phone Callback method, Two-Step Login calls you on your mobile phone or landline.

To authenticate:

1. When you're prompted with the Two-Step Login screen, click Call Me.
2. Answer the phone call.
3. When you hear the automated "Welcome to Cornell Two-Step Login" greeting, press the requested number key on your phone to authenticate.  To find the number:
   • Press the number shown in the authentication prompt on your computer screen:
     
      
     
     or   
   • For a phone with Caller ID, the number you need to press appears as the last digit of the incoming phone number. For example, if Caller ID displays 607-253-3333, press 3 on your phone keypad to log in;
     
     or  
   • Listen to the phone message and press the requested number on your phone.

For more information, see Duo Security's Guide to Two-Factor Authentication.