Device Guides
Apple iPhone 5
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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I can't make video calls using FaceTime
This troubleshooting guide will take you through a number of possible causes
to help you find a solution to your problem.
Change network mode or try making a video call using a Wi-Fi network.
Possible cause 4:
Video calls are not supported by the mobile network
Solution:
Change network mode or try making a video call using a Wi-Fi network.
Find "Voice & Data"
Tap Settings.
Tap Mobile Data.
Tap Voice & Data.
Select network mode
Tap the required network mode.
There may be different network modes available depending on where you are. Depending on the network mode selected, your mobile phone will always find the network with the highest data speed and best signal.
Tap Mobile Data.
Return to the home screen
Tap the Home key to return to the home screen.