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https://itnerd.blog/2019/02/08/why-you-need-to-update-to-ios-12-1-4-and-install-the-macos-mojave-update-right-now-goes-beyond-the-facetime-bug/
The Reason Why You Need To Update To iOS 12.1.4 And Install The macOS Mojave Update RIGHT NOW Goes Beyond The FaceTime Bug