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.