https://phys.org/news/2018-10-apple-ios12-emojis-group-facetime.html

The update, a hefty 512 megabytes, adds two features touted back in June when Apple first previewed iOS12. The most eagerly awaited is Group FaceTime, which lets up to 32 people have a group conversation at one time.

"The tile of the person speaking gets larger automatically, so you'll never lose track of the conversation," Apple says. "You can start Group FaceTime right from a group thread in Messages or join an active one at any time."