Duo Security is now a part of Cisco. About Cisco. Add robust two-factor authentication to your VPN, email, web portal, cloud services, etc. After successful primary authentication, your users simply approve a secondary authentication request pushed to our Duo Mobile smartphone app. Users may also authenticate by answering a phone call or by entering a one-time passcode generated by the Duo Mobile app, a compatible hardware token, or received via SMS. With our free day trial of our Duo Access plan , you can see for yourself how easy it is to get started with Duo's trusted access.
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You can use Duo to call your family, friends, and anyone else who uses the app. Learn more about Google Duo. Duo is available on Android phones and tablets. When you sign up, you'll get a verification code on your phone. You can skip phone number verification.
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Account Options Sign in. Top charts. New releases. Duo Mobile Duo Security, Inc. Add to Wishlist. Duo Mobile works with Duo Security's two-factor authentication service to make logins more secure.
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