how do I use FaceTime without my Sim card
How do I use FaceTime without my Sim card on my iPhone 6
Once your iPhone has been activated, and you are using Wi-Fi in an area that supports FaceTime (not, for example, in the UAE), then FaceTime should work.
If you meet these prerequisites, tell us what happens when you attempt to use FaceTime. Also tell us what version of iOS you are using.