JigarSuva , via OnePlus 8 , Feb 27, 2021 : In the OnePlus 8 series smartphone the "OK Google" or "Hey Google" command isn't working. There is no response from the phone when you speak to it. For using voice search you need to push the mic button everytime. This issue resolves when you restart the phone but persists again after a day or two. Hope OnePlus fixes this early.