Step #1. Tap on Phone app on your iPhone.
Open Phone App on iPhone
Step 2. Tap on Contacts at the bottom.
Step 3. Choose a contact you want to make a FaceTime call (remember that you can only make a FaceTime call to a person who owns iPhone, iPad, iPod or Mac with facility to receive FaceTime calls).
Read more: http://tinyurl.com/njdrdqo