We've been regular users of FaceTime for a while now, and it's a convenient way to keep in touch with family and friends. It's a great video chat service available to iPhone, iPad and Mac users, made even greater when used with Siri.
To instigate a FaceTime session with a someone in your contacts, as always hold down the home (side button on the iPhone X), or say 'Hey Siri':
Hey Siri, FaceTime Jane Smith
Siri will ask you to choose the connection method (email address or iPhone number) and then make the call for you.
If you'd rather not show your face, or don't want your important client to see you in your pyjamas, you can also trigger a FaceTime Audio call.
Hey Siri, FaceTime Audio Jane Smith