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How to use Duo with an offline cell phone.
How to add, remove, reactivate or deactivate Duo devices.
How to replace a phone used for Duo two-step authentication.
Duo hardware tokens are a good option if you don't have a smartphone, or if you need a second Duo device.
Get signed up for Duo two-step login!
How to use Duo with an Apple Watch.
What to do if the Duo sign-up process fails.
Troubleshoot common Duo login issues.
Using Duo with a mobile device is the recommended option.