Guys, can you unlock your phone by saying "Ok Google" when the screen is off.
If i'm not mistaken, we can unlock our phone with this feature but after the some update of "Google" apps or system patch, it seems that the feature has removed aka Nerf.
@I did that with Mi A1 before but after some update, the feature has gone. @

You may check by entering the Setting\Security\Smart Lock\Confirm your PIN\Trusted voice\Say "Ok Google" any time.
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The latest description is stated as below:
Your device recognizes your voice when you say "Ok Google", even when you're using your favorite apps.
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In before, the description was stated as below:
Your device recognizes your voice when you say "Ok Google", even if the screen is off or you're using your favorite apps.
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This picture is just for reference.


Secondly, there is a well-known issue for this device which is:
Google Assistant would not say anything(speak it out) when we are asking about the weather or etc. Sometimes it will sometimes it will not, do you have perceived it?? This issue happened after the September 2017 security patch.

This post has been edited by jerome1992: Oct 14 2017, 01:55 AM