Voice Control Offline

For that you will need the Google Now offline voice recognition.

Go to settings >> Offline speech recognition (download latest supported language files).

You can perform some offline voice actions (play music, turn on wifi, turn on flashlight)

Here is a screenshot of Google assistant offline commands:

To make a call while offline:

• Tap the mic on Google assistant


• Then say Call "xx" where xx is any contact


• After this it recognises the voice and identifies the contact and immediately calls the contact

See below screenshot:

^{(click images for larger variants)}