Today, we’ve started rolling out group video calling on iPhone, iPad and Android phones and tablets in Western Europe and North America and we expect to have completed our roll-out to these markets over the next week or so. We plan to be fully available worldwide in March
This brings the mobile experience in line with that already available on the desktop.
The UI lets you choose between a grid view of all those in the call, and a focus view that automatically switches to the person speaking. Alternatively, if you only really care about one person in the call, you can use a ‘pin’ feature to stick with your view of them.