According to Apple, the FaceTime problems stem from a device certificate that expired on April 16, 2014. This expired certificate renders FaceTime unusable on devices running older versions of iOS. The only fix for this issue is to update to the latest version of iOS.
Apple advises users to update to iOS 7.1 if their device is capable of running the iOS 7 operating system. Older devices that are not compatible with iOS 7 should upgrade to iOS 6.1.6. iOS owners running iOS 7.0.4 or later or iOS 6.1.6 are not affected by this glitch and do not have to upgrade.
iOS automatically presents the most recent compatible update for your device. If you’re using an iOS 7 compatible device and you’re still on an earlier version of iOS, you should update to iOS 7.1 or later. If you’re using a device that isn’t iOS 7 compatible, you should update to iOS 6.1.6.
Apple also mentions OS X owners in this support document and again advises users to upgrade to a more recent version of the operating system. Though not as vocal as iOS owners who took to Apple support forums with their complaints, there apparently are some OS X versions susceptible to this glitch.
If you’re using OS X Mavericks v10.9, update to OS X Mavericks v10.9.2 or later. If you’re using OS X Mountain Lion v10.8 or OS X Lion v10.7, install the latest security updates or update to OS X Mavericks v10.9. If you’re using Mac OS X v10.6, you should get the latest version of FaceTime for Mac in the Mac App Store.
Are you affected by this FaceTime bug? What do you think of Apple’s proposed solution? Let us know in the comments.