Apple has released its iOS 12.1.4 update, re-enabling support for Group FaceTime after fixing a major exploit.
Last Monday, Apple announced that it had disabled Group FaceTime calls in order to fix a recently discovered exploit that allowed users to listen to audio broadcasted from another person's device before they answered a FaceTime call. According to the Apple Support page detailing the update, this exploit was a "logic issue" that has been resolved by implementing "improved state management."
With this update, FaceTime calls with up to 32 participants are now once again safe and viable, with that 32-person limit surpassing the 25-person limit of Google's Hangouts and far surpassing the 4-person limit of Facebook's WhatsApp Messenger. This is provided, of course, that you and all possible participants have a compatible iPhone, iPad, or iPod touch.