1. Find "FaceTime"
2. Turn on FaceTime
3. Make a video call
The contact details are displayed.
4. Select option
Mute or unmute the microphone, go to 4a.
Change camera, go to 4b.
5. 4a - Mute or unmute the microphone
Depending on the current setting, the microphone is muted or unmuted.
6. 4b - Change camera
Depending on the current setting the front or back camera is turned on.