With FaceTime Audio over the mobile network to make calls
- Click the FaceTime App on your contact.
- Here you will find a FaceTime entry, if this contact also has an iOS devices.
- Right next to it is the Icon for the video telephony, as well as a telephone handset icon.
- Click the telephone handset icon to start FaceTime Audio.

FaceTime Audio Phone Icon
In a further practical tip read everything about the function of FaceTime.