How to use facetime feature in iPhone?

To use FaceTime on your iPhone:

1. Go to Settings > FaceTime and sign in with your Apple ID.
2. Use the FaceTime app, Phone app, or Messages app to start a video or audio call.
3. Swipe or tap Accept to answer or Decline to ignore.
4. Mute, switch cameras, blur backgrounds, add effects, or share your screen during calls.
5. Add multiple contacts in a FaceTime call.
6. Share FaceTime links to invite others, even non-Apple users.

If you face some issue why my facetime is not working then read the article.