Apple just released iOS 12.1.4 and a MacOS 10.14.3 patch. These updates fix the large group of FaceTime errors that can let anyone call your iPhone, iPad or Mac and hear sounds or watch video even if you don't accept the call.
The good news is that you don't have to worry about this error right now. Apple says it is permanently disabled group FaceTime 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 FaceTime on a group for more than a week while Apple was working on the fix. As Apple's system status page points to, the FaceTime servers group is now back online and you can again make group FaceTime calls – but only after you 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 again enabling FaceTime on your iPhone, iPad or Mac.
On an iPhone or iPad, go to Settings> FaceTime and select FaceTime. On a Mac, launch FaceTime and select FaceTime> Turn FaceTime On.
You must repeat this step on every iPhone, iPad and Mac you own. The option is controlled separately for each device.
This bug fix was originally supposed to arrive last week, but Apple delayed it. Now it's finally here. This delay did not endanger anyone because Apple had already hit the group's FaceTime servers, but now iPhone, iPad and Mac users can re-use the FaceTime group.
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