|Duo Option||Description||Connection Required?|
|Duo Push||A pop-up notification on your smartphone||Yes, WiFi or cellular (2KB per push)|
|Duo App Pass Code||A code generated by the Duo app on your smartphone or tablet||No|
|Text/SMS||A text message sent to your cell phone||Yes, cellular|
|Call||A phone call||Yes, landline or cellular|
|Token||A hardware token||No|
The Duo app and hardware tokens are subject to export control regulations. According to federal export control regulations, the Duo app and hardware tokens may not be transported or sent to embargoed nations identified by the U.S. State Department. The following nations are on the embargoed list as of January 2020:
- Crimea Region of Ukraine
- North Korea
If you are traveling to any of those countries, delete or uninstall the Duo app from any devices you will take with you and do not take Duo hardware tokens with you.
You can use other Duo options, such as a phone call or passcodes via text message, while traveling in embargoed countries.