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No Smartphone? No Problem.

For offline users or those without a smartphone, they can still authenticate with Duo’s phone callback method. Call any phone number enrolled to a user and let them confirm their identity by answering the call and pressing a key.

Administrators can configure the sender’s phone number and specific keys to press to approve and deny authentication and report fraud.

Trusted Users

Phone callback is one of many two-factor authentication methods that Duo supports to ensure Trusted Users, part of a complete Trusted Access solution.

Watch how Duo works with any phone.


Ready to Get Started?

Try out Duo Access for 30 days to experience Trusted Access.