The shutter-click sound emitted by most camera phones when taking a picture is an auditory skeuomorph-it does not come from a mechanical shutter, which camera phones lack, but from a sound file in the phone's operating system.
The shutter-click sound emitted by an iPhone when it takes a picture is an auditory skeuomorph. It does not come from a mechanical shutter, which the iPhone lacks, but from a sound file (photoShutter.caf) in the phone's operating system.