Aporte original por: Tobias Isakeit ,
The shutter sound can not be muted (at this moment). Not in the camera settings nor in the sound -> other sounds settings. Even when the sound is completely muted via the notification bar there is still a shutter sound. Maybe there will be an update on that soon or you use another photo app as jayeff suggested. You might want to contact the people from FairPhone directly to see if they have a solution.