How to Turn-Off or Disable Google Assistant(Ok Google) on Android?
Step 1: Open the Google App, and then Tap on 'More' link at the bottom right.
Step 2: Tap on 'Settings', and again Tap on 'Settings' under Google assistant.
Step 5: Tap on Assistant Tab, scroll down, and then click on 'Phone'.
Step 6: Tap on 'Voice Model', and then tap on 'Delete Voice Model'.
Step 7: Tap on toggle next to 'Google Assistant' to disable it.
It's done.
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