Introduction
This article provides instructions for enrolling a landline or basic cell phone (non-smartphone) in Duo Multi-Factor Authentication (MFA). This method allows you to verify your identity via a voice call or an SMS text message.
While this method is available, the Duo Mobile App is the recommended and more secure option for smartphone users.
Enrolling a Phone Number in Duo
- On the Select an option page of the Duo portal, select Phone number. The phone entry page will open.
- Enter Phone Details:
- Verify the Country Code is correct.
- Enter your 10-digit phone number (e.g., 520-555-0100).
- For Landlines: You must check the box "This is a landline phone".
- For Basic Cell Phones (SMS): Ensure the landline checkbox is unchecked.
- Select Add phone number.
- Handle Extensions (Landline Only):
- If your landline has an extension, enter it and select Add extension.
- If there is no extension, select Skip this step.
- Verification: Double-check the number displayed on the screen. If correct, select Yes, it’s correct.
- Completion: The 'Added phone' or 'Added phone call' confirmation page will appear. Depending on the device type, you are now ready to receive SMS codes or automated voice calls for MFA.
Need Help with Duo?
If you encounter issues during setup, such as not receiving the verification call or text, please submit a Duo Support Ticket for technical assistance.