Apple just released iOS 12.1.4 and one macOS patch 10.14.3. These updates correct the huge FaceTime group flawed which could allow anyone to call your iPhone, iPad or Mac and hear sound or see video, even if you do not accept the call .
The good news is that you don't have to worry about this flaw yet. Apple says it is permanently disabled from the FaceTime group on iOS 12.1.3 and macOS 10.14.2, as well as older versions of the software.
The bad news was that you couldn't use the FaceTime group for more than a week while Apple was working on the fix. As Apple system status the page highlights, the Group FaceTime servers are back online and you can make Group FaceTime calls again, but only after the update.
To update an iPhone or iPad, go to Settings> General> Software Update on your iPhone or iPad and install the update. On a Mac, go to the Apple menu> System Preferences> Software Update.
After installing the update, you can feel secure by reactivating FaceTime on your iPhone, iPad, or Mac.
On an iPhone or iPad, go to Settings> FaceTime and activate FaceTime. On a Mac, launch FaceTime and select FaceTime> Activate FaceTime.
You will need to repeat this step on each iPhone, iPad, and Mac you have. The option is controlled separately for each device.
This bug fix was originally scheduled to arrive last week, but Apple delayed it. Now it's finally here. This delay did not put anyone in danger, because Apple had already deleted the group's FaceTime servers, but iPhone, iPad and Mac users can now use the FaceTime group again.