When joining a breakout room by telephone, you do not need to do anything to join. Once the host starts the breakout rooms, you will be notified that you have been added to a breakout room.
You will be able to mute and unmute like you can in the main session. Use *6 to mute or unmute.
You will be notified when the host has ended the breakout rooms and that you will be returning to the main room in 60 seconds. Press # to join the main room immediately.