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How to use Duo with an offline cell phone.

Using Duo with a mobile device is the recommended option.

How to add, remove, reactivate or deactivate Duo devices.

What to do if you forgot your Duo device.

Duo hardware tokens are a good option if you don't have a smartphone, or if you need a second Duo device.

How to replace a phone used for Duo two-step authentication.

How to confirm you are enrolled in Duo two-step login.

How to remove or replace a hardware token.

What to do with a former employee's Duo hardware token.

How to reactivate your phone for Duo.

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