How to set up facetime on 4g on iphone 5 and AT&T?

I know you have to login to your att acount and stuff but how do you actually activate the facetime on 4g?

You just FaceTime someone over the cellular data… You don't need to turn it on.

But in case that was a lie. Go to your Setting>FaceTime. If there's a Cellular switch in that options menu, turn it on.

Otherwise, you don't need to do anything.