Many people have been very scared by the recently Group FaceTime bug. This bug allowed to listen and watch anyone with Group FaceTime without them picking up the phone. This made many people very stressed out, prompting many people to turn off FaceTime, until on February 1st when Apple turned off Group FaceTime. This was not a permanent solution, but worked fine until today, February 7th, when Apple release iOS 12.1.4. This bug was a huge security breach, so I would recommend updating all of your devices and to encourage anyone else to.
The Software Update 