Previously the feature was only available when using Google Meet on a computer but now the company has made it possible for hosts and co-hosts to lock all participants' audio and video from iOS devices. According to an update in the Google Workspace blog though, Google also plans to make this feature available for Android smartphones early next year.
By giving hosts and co-host the ability to mute all participants' audio and preventing them from using their cameras, it will be easier to keep meetings on track and productive as there will be less disruptions.
Audio Lock & Video Lock
However, when this feature is enabled, mobile participants may be removed from a meeting if their device doesn't have the most recent version of the Meet or Gmail app, Android OS version M or newer or iOS version 12 or newer. Once the feature has been disabled though, these removed participants will be able to rejoin a meeting.
It's also worth noting that this feature is available to all Google Workspace customers as well as all G Suite Basic and Business customers.
While employees, managers and partners are a bit better at quieting down in a meeting, Audio Lock & Video Lock could be particularly useful for teachers and educators conducting remote learning classes using Google Meet.