Make a FaceTime call. To make a FaceTime call, you need the person's phone number or registered email address. There are a few ways to make a FaceTime call: 1  In the FaceTime app, enter the person's phone number or email address then tap the FaceTime video or audio icon.2  If you have the person's phone number or email address saved in your Contacts, you can enter their name, then tap the video or audio icon.ake a FaceTime call. To make a FaceTime call, you need the person's phone number or registered email address. There are a few ways to make a FaceTime call: 1  In the FaceTime app, enter the person's phone number or email address then tap the FaceTime video or audio icon.