Set up FaceTime on iPhone

In the FaceTime app , you can make video or audio calls to friends and family, whether they’re using an iPhone, iPad, iPod touch, or a Mac. With the front camera, you can talk face-to-face; switch to the rear camera to share what you see around you. To capture a moment of your conversation, take a FaceTime Live Photo.

Note: FaceTime, or some FaceTime features, may not be available in all countries or regions.

Go to Settings > FaceTime, then turn on FaceTime.
If you want to be able to take Live Photos during FaceTime calls, turn on FaceTime Live Photos.
Enter your phone number, Apple ID, or email address to use with FaceTime.

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iPhone User Guide

Set up FaceTime on iPhone