Use FaceTime on your iPhone - Apple Support

Make video or audio calls with FaceTime.

Check your Apple ID device list to find where you're signed in - Apple Support

Get to know Dark Mode - Apple Support

Use Face ID - Apple Support

Make and receive FaceTime video calls on Mac - Apple Support

How to Use Apple FaceTime Like a Pro

iOS 15: How to FaceTime Android Users - MacRumors

Use Spotlight Search on your iPhone, iPad, or iPod touch - Apple Support

How to chat live with Apple Support on the web or your device

Join a FaceTime call from an Android or Windows device - Apple Support

Official Apple Support

FaceTime User Guide for Mac - Apple Support

Use FaceTime on your iPhone - Apple Support

Continuity Camera: Use iPhone as a webcam for Mac - Apple Support