Absolutely. While on a call, you can use the meeting chat to message other meeting attendees who are also on Biba (meeting chat not available through the web viewer).
You can also message Biba users who aren't in the meeting, because you don’t actually need to stay on the call screen. You can send messages and even navigate outside of Biba, as long as you don’t use any applications that require audio. Please note that this functionality may depend on your cellular provider’s plan.