Can’t use FaceTime on Mobile/Cellular Data

It took me a while to find the answer, but couldn’t use FaceTime unless I had WiFi connection and couldn’t get to use it on mobile/cellular data.

Answer is check you have FaceTime installed, as it looks like I had deleted it by accident and didn’t understand why I was able to see it in my apps but not listed under Mobile/Cellular Data. Hope this helps if someone else has same issue