I know that we can launch the assistant on the phone (either Siri or Okay Google or any other) by clicking on the phone button on the back of Sena 20s. However, this might not be a really practical idea, since you could get a ticket for riding with one hand, and it is dangerous too. 

Is there a way I can launch the assistant on the phone just by issuing a voice command? I couldn't find that command in http://support.sena.com/entries/62935980-What-Are-the-Voice-Commands-Heard-on-the-20S-