Microsoft has just released support for QR Codes in Power BI! If you go into the “in focus” view of a dashboard and click on the ellipsis on the right of the dashboard, you can now generate a QR code that will work as a link to that dashboard from your mobile phone.
The possibilities are quite exciting – for example, if you were running a manufacturing plant you could put a QR code label on every piece of equipment and then use your phone to launch the Power BI app to show a dashboard specific to that machine.