Why doesn't my iPhone 4 have FaceTime?

My mom gave me her iPhone 4 until they get iPhone 5c ordered. And I can't seem to find FaceTime. Why is this? Can anyone help me?

Click on your phone app, and FaceTime should be somewhere in there I believe. Or click a contact and click FaceTime call instead of voice call. I think my moms old phone did that at one point and it confused me.

I don't think it has the hardware for it?

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