Why isn't my facetime cellular working?

I have an iPhone 4 running ios 6 on Verizon. And whenever I try to facetime my sister or whoever when I don't have Wi-Fi it never let's me! I'm facetiming her and then it says "no network connection" and it tells me to connect to a Wi-Fi network.

Look on google

You can only FaceTime on Wi-Fi… To bypass this you have to jailbreak and install a tweak.

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