All of those nifty Google voice commands are one of the major strengths of using an Android phone. But they’re even more powerful if you enable “Ok Google” detection from any screen.
This means whether your phone is locked or you’re using another app, you can just speak a question or command to put Google’s search power to use.
To start, launch the Google app and open Settings > Ok Google detection. Then toggle From any screen.

Turn on the always-listening mode from the Google app.
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