Why doesn't my iPhone 4S have FaceTime in the settings, can't use?

Had my iPhone 4S replaced due to a cracked screen about a month ago. Since I replaced it I have not had iMessages or FaceTime, tried to turn it on and play with settings within my Settings but there's not FaceTime setting available. I know it should be there but is here any reason it wouldn't be? And what can I do to fix it besides a trip to the apple store?

It does not have face time because your carrier wants you to use the phone instead so they get more money, i don't know why you wouldnt have messages

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