You can register any call- or SMS-capable device for Multi-Factor Authentication (MFA), though we highly recommend using the Duo Mobile app for convenience. Please use a computer or separate device to register and have your authentication device handy to complete the registration process. A stable network connection (WiFi or data) is recommended.
To add or remove a device from your existing Duo account, please ensure that you have a registered device available. You will need to accept an authentication request to verify your identity to make changes to your account.