We recently heard that owners of iOS 6 devices were having problems with Apple’s FaceTime app, and now it looks like there is a fix for the problem, although you will have to upgrade your OS to iOS 7.
Devices that are capable of upgrading to iOS 7 need to upgrade to iOS 7.0.4 or later, and devices that cannot upgrade to iOS 7 have to update to iOS 6.1.6, you can see more details below.

If you started to have issues making or receiving FaceTime calls after April 16, 2014, your device or your friend’s device may have encountered a bug resulting from a device certificate that expired on that date. Updating both devices to the latest software will resolve this issue.
If you’re using iOS 7.0.4 or later or iOS 6.1.6, this issue doesn’t affect you.
If you’re using these versions of OS X or FaceTime for Mac, this issue doesn’t affect you:
– OS X Mavericks v10.9.2 or later
– OS X Mountain Lion v10.8 with the latest security updates
– OS X Lion v10.7 with the latest security updates
– FaceTime for Mac version 1.0.5 or later for Mac OS X v10.6
If you have updated your device to iOS 7.0.4 or iOS 6.1.6 or above, leave a comment and let us know if this has fixed the issue with FaceTime.
Source MacRumors
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