While an Internet connection is required for adding the device to a user’s Duo account, the app can be used to generate OTP codes even when cellular data or Wi-Fi networks are not available. The app is simple to register and use. It functions in various modes, with or without cellular data or Wi-Fi connection. Any Duo-protected application can be authenticated with the app. It is not necessary to disclose the phone number for a smartphone to use the app.
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