Google Voice Assistant
Google Voice Assistant comes with Android phones or can be downloaded directly from the Play Store,
It can be used to access a wide variety of functions on your phone, below is a clip of me using it to place a call simply by saying, 'Ok, Google, Call home' and another video showing a range of other functions.
You can send Messages, Whatsapps, Emails, Set alarms, Search Google etc etc. Infact it gives you full functionality as you would have via the Google Home Smart Speaker
More instructions are available here