Setting up Duo on a New Device

From time to time we all replace our smartphones for one reason or another. As long as your phone number hasn't changed, you can easily port your Duo 2-factor authentication over without needing to contact Information Security.

To begin, start by downloading the Duo Mobile App for your smart phone.  Although the Duo Security platform has multiple ways to provide a second authentication factor, we recommend using the Duo Mobile app for IOS and Android for the best experience.    

  • On your Android device open up the Google Play store and search for "Duo Mobile".  It can also be found here.  
  • Tap "install" to start the application installation 


  • On your Apple device open up the App store and search for "Duo Mobile".  It can also be found here.  
  • Tap "get" to start the applicaiton installation 

Duo App Store

Open a web browser on your computer and navigate to the Stockton goPortal at to login to your account by clicking on the "Login to goStockton Portal".  



After entering your username and password you will be prompted to authenticate with Duo. Click on the “Add a new device” button.

A screenshot showing the add a new device button for Duo Security


Verify your account using either of the alternative options (or a push if the previously-registered device is still available):

  • Text message (SMS): A text message with a one-time use code is sent to your phone.
    A screenshot of the text message authentication button in Duo.
  • Voice call: A call will be made to the number on file. Press 1 to accept, press # to report a fraudulent authentication attempt.
    A screenshot of the voice call authentication button in Duo.


If you have a new phone number and do not have access to your old phone, you will need to contact Information Security at (609)-652-4779 for assistance.

Next, select the setup option "Mobile phone"

A screenshot showing the device type selection dialog for Duo security


Enter the phone number of the smartphone you're enrolling in your existing Duo 2-Factor Authentication account, be sure to check the confirmation box that your phone number is correct.

A screenshot showing the phone number entry screen for Duo security


Select a device type

A screenshot showing the mobile phone type selection screen for Duo security










Depending on the device you’ll be enrolling into Duo 2-Factor Authentication, follow either the Android or iPhone instructions below. If selecting “Other” you’ll receive the option of either receiving a phone call or a text message passcode to authenticate.





Launch the Duo Mobile app, then tap on the “Add Account” button to open up your camera and scan the QR code on your computer screen.
Launch the Duo Mobile app, accept the license agreement, then tap on the plus icon (+) button at the top-right of your phone screen to open up your camera. Scan the QR code on your computer screen to proceed.
A screenshot showing the QR code used to activate a Duo mobile Android installation
A screenshot showing the QR code used to activate a Duo mobile iPhone installation


If your scan was successful, you should see a green check mark appear over the QR code. Click Continue to proceed.