Install iOS 12.1.4 for Group FaceTime
If you skipped iOS 12.1/iOS 12.1.1/iOS 12.1.2/iOS 12.1.3, you'll get Group Face Time calls with your iOS 12.1.4 update. If you are currently running iOS 12.1, iOS 12.1.1, iOS 12.1.2, or iOS 12.1.3, you'll need to download iOS 12.1.4 in order to continue using Group FaceTime.
If you're running the latest version of iOS 12, FaceTime group video calls are integrated right into Messages making it easy to start up a group call with co-workers, family members, or friends.
The feature supports up to 32 callers on one call, but you'll only see the people talking or people you want to focus on on the screen. Everyone else is shown in a roster on the bottom of the call.
Group FaceTime calls allow you to add your Memoji or Animoji if you own an iPhone X, iPhone XS, or iPhone XS Max and you can also use filters if your heart desires.
iOS 12.1 also brought some other improvements to FaceTime including:
If you're a heavy FaceTime user, you'll want to download iOS 12.1.4. Again, the feature is permanently disabled on iOS 12.1, iOS 12.1.1, iOS 12.1.2, and iOS 12.1.3 so you'll need to download iOS 12.1.4 in order to use it.