Q: How do I use SMS or text passcodes for 2-Step?
A: You can request to have passcodes sent to your mobile phone via text message when prompted to complete a 2-Step. Duo will send you 10 single-use passcodes in a single text message. Simply enter a code from your text message into the field for passcodes in the Duo login screen. See the Duo "Basic Cell Phone" page for detailed instructions.