[DerfNet]

So, how does this work on a smart device? Do you plug the Yubikey into an OTG, or do you just not access anything on your phone?

[thinkMOAR]

Typically you can load the key (from the ubikey) into google authenticator too on your phone

[aendruk]

YubiKey via USB, OpenKeychain, and zeapo/Android-Password-Store.