Follow these steps to enroll in Duo with your smartphone. 

Before you begin:

• We recommend performing these steps during support hours (M - F, 7 a.m. - 6 p.m.)
• Make sure your smartphone is charged
• You will need your Apple App Store or Android Play Store password to complete Step 2
• If you are registering your smartphone as a second device, use these instructions.

Part 1: Begin Duo Enrollment from Your Computer

Note: These steps must be completed on a laptop or desktop computer.

1. To begin your Duo enrollment, open your web browser to https://computingaccounts.ucdavis.edu, select the Duo Multifactor Authentication option, and log into CAS.
2. Your browser will now show the Duo Enrollment screen. Click Start setup.
   
3. You are prompted to select the type of device you are adding. Select Mobile phone, and then click Continue.
   
4. Enter your mobile phone number in the space provided.
   
5. After entering the phone number, a second field displays for you to confirm the number. Check that the number is correct, select the checkbox, and then click Continue. 
   
   Note: If you are using an international phone number, you can select your country from the drop down menu as illustrated below:
   
6. Enter the type of mobile phone you are enrolling, and then click Continue. (NOTE: Smartphone users should select iPhone, Android, or Windows Phone.)
   

Part 2: Install the Duo Mobile App on Your Smartphone

1. Go to the App Store or Play Store on your smartphone.
2. Search for Duo Mobile.
3. Install the app on your smartphone. There is no fee to install the app.

NOTE: You will need your App Store or Play Store password to complete installation

Part 3: Complete Enrollment Using Your Computer and Your Smartphone

1. After completing the installation of the app on the smartphone, on your computer, click I have Duo Mobile installed.
   
2. The Activate Duo Mobile screen displays. With the Activate Duo Mobile screen displaying on the computer, open the Duo Mobile app on the smartphone.
   
3. Click the plus sign (+) in the upper right corner of the phone screen.
    
4. From the Duo Mobile app, scan the barcode that displays in the Activate Duo Mobile computer screen.
   
5. A green checkmark displays on the computer screen.  Click Continue.  You are done with enrollment and can skip to Part 5 below. 
    

Part 4: Complete Enrollment Using Your Smartphone (No Computer)

1. After completing the installation of the app on the smartphone, on your computer, click I have Duo Mobile installed.
   
2. The Activate Duo Mobile screen displays. Click on the Email me an activation link instead link.
   
3. Enter an email address you access to on your smartphone and press Send email.
   
4. On your smartphone, open your email.  You should receive an email from "Duo Security <no-reply@duosecurity.com>" with a link to a web site.  Click this link open a web site with the activation link.  On the web site, click the Activate Duo Mobile link to activate the Duo mobile application.
   
   
5. You have now enrolled the Duo mobile app. Click Continue.
   
6. Press Finish Enrollment to complete the enrollment of your Smartphone.

Part 5: Select Duo Authentication Method on the Computer 

1. The Enrollment Successful screen displays. Click Dismiss.
    
2. Verify that your phone number is correct, and select an authentication option for When I log in. The recommended setting is Automatically send this device a Duo Push.
   
3. Click Save, then click Finish Enrollment.

Ready to register a second device in Duo? See KB0003229.