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Introduction
We recommend registering at least two devices.
- If you have at least two available, you'll always be able to use Duo, even if your default device is unavailable — for example, if you forget your smartphone at home, or lose it.
- Don't have a second device? We recommend using the Duo Mobile app to pre-generate mobile passcodes you could use later to login in a pinch.
The following device types work with Duo:
Keep reading to learn more about these options.
Which devices should I register?
Smartphones and tablets
Please Note:
March 31, 2026: Duo Mobile version 4.85 or later will be required. Duo Push and Verified Push will no longer work on older app versions.
If no action is taken, users who don’t update by March 31 will see an
Update Required message when authenticating and won’t be able to use Push methods, though passcodes will still work.
April 15, 2026: Duo will end support for older operating systems,
including iOS 16 and Android 11. Devices on unsupported OS versions may not be able to update Duo Mobile.
If no action is taken, users may lose access to the app entirely and will need to
register an alternate Duo authentication method.
Smartphones are by far the most popular type of device to register with Duo because they're the easiest to use during login, and most people already carry a smartphone. At the University of Oregon, more than 90% of Duo users have registered a mobile device. Many login methods are possible with a smartphone or tablet after you install the free Duo Mobile app from Duo security:
- Duo Mobile's Verified Push feature: Receive a notification on your device, enter the three-digit code that appears on your computer on your device, and tap Approve
- Generate a passcode: Enter digits into the Duo passcode field and click Login (these are great because they work even if your phone doesn't have an Internet connection!)
- Pre-generate passcodes for emergencies: You can use the app to pre-generate passcodes you can use later as a backup way to login if your device is unavailable
- Receive a phone call from Duo: Answer and press 1 to login
- Receive passcodes via SMS (text message): Enter digits into the Duo passcode field and click Login
- Biometric verification: Once registered, these work for logging in to services on the device with the biometric feature.
Non-smart cell phones
Your mobile doesn't have to be smart to help you stay secure with Duo! You can also register non-smart cell phones and use these login methods:
- Receive passcodes via SMS (text message): Enter the six digits into the Duo passcode field and click Login
- Receive a phone call from Duo: Answer and press 1 to login
Landline phones
Since most landline phones on campus have moved to Microsoft Teams which requires two-factor authentication, we do not recommend that you use your UO extension for this option. Other options include:
- If you use a Cisco IP Phone for your extension, you can have Duo call that line.
- You can also have Duo call either your cell phone, a tablet, or use a hardware token.
- You can register your home landline if you work remotely.
To use a landline phone, you'll just answer a phone call from Duo, and press 1 to login.
Hardware tokens
Hardware tokens are recommended for users who have no other devices to register with Duo.
- These tokens are small fobs about the size of a key fob. They generate passcodes the same way the Duo Mobile app does.
- To use a token, you'll press a small button on the token and wait for the passcode to appear. This can sometimes take a few moments. When your passcode is ready, enter the digits into Duo's passcode field and click Login.
For more information about tokens, including how to get one from UO, please see this related article.
Can I or do I have to register a computer?
Please Note: Biometric verification only works for logging in to services on the device with the biometric feature.
- Mac desktops and laptops with Touch ID can be registered within Duo.
- Personal Windows PCs with Windows Hello can be registered within Duo.
For more information, please consult the Using Biometric Verification with Duo Universal Prompt article.
How do I register?
See the related article Getting Started with Two-Step Login (Duo) for instructions.