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.
Enrolling a Phone Number in Duo
This method is only available for devices that cannot install the Duo Mobile app. To request permission for SMS authentication, submit a
Duo Service Request.
- On the Select an option page of the Duo portal, select Phone number. The phone entry page opens.
- 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 This is a landline phone box.
- For Basic Cell Phones (SMS): Ensure the This is a landline phone check box is clear (not checked).
- 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 appears. 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.