How to make video calls over a mobile network on iphone?

Apples website says iPhone 4S and 5 can make video calls over a mobile network as well as FaceTime over 3G and Wi-Fi but how?

See http://store.apple.com/...ne/compare under video calling.

First of all, apple sucks. Second of all, I don't know, and third of all, call the apple company and ask!

This is how to enable facetime using 3g on ios6: cnet.com/news/how-to-enable-facetime-ove…

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