You can restart your iPhone by pressing the power button, wait for the words Slide Unlock iPhone to power off, slide to the instructions to turn off the device, then turn it on again.
Turn off hot on iPhone 7/7 Plus
If your iPhone is frozen due to FaceTime , press and hold the power button and the Home key to reboot, on your iPhone 7/7 Plus press the power button and the volume down key.
Disable FaceTime and re-enable it
Please disable FaceTime, then re-enable it to fix the FaceTime not working error. Heres how to do it: Go to Settings> FaceTime> Off and then re-enable it.
Reset the date and time according to the correct region
Maybe FaceTime is not working because the date and time set up on the iPhone is incorrect compared to the current region you are using. Go to Settings> General> Date & Time, then reset the date and time according to your region.
Go to speedtest.net to check the speed of the internet in use
Apart from the above issues, it is possible that FaceTime is not working due to the internet connection. See if your internet network is faulty or weak? Because if so, the signal transmission of FaceTime is also poor. Make sure your home internet always has the best connection.
Check if the FaceTime call number is in the block list or not?
Another reason why the iPhone has FaceTime error is because users have blocked the number of people who want to call. Please unblock that phone number and reconnect. However, its also possible that the users FaceTime is limited by Apple, contact an Apple center for assistance.
Hopefully the phenomenon of iPhone not calling video calls will be completely overcome after you finish reading this article. Good luck!
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