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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.