Why isn't iOS 8.3 letting me FaceTime?

Yesterday I updated the iPhone 4s with iOS 8.3, because I thought it might help my camera since all I seen was black but now the update worked but I can't FaceTime anyone. The app isn't even there

IPhones never had a specific FaceTime app, built into the Phone app.

Check an Apple Store concerning your camera & FaceTime issue

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