To turn off the shutter sound on your iPhone, follow these steps:
1. Open the 'Camera' app on your iPhone.
2. Make sure that your iPhone is not in silent mode by toggling the switch on the left side of the device.
3. Tap on the 'Live' or 'Photo' mode option at the bottom of the screen to enable the camera view.
4. Once you are in the camera view, tap on the volume button located on the left side of your iPhone.
5. Turn down the volume to zero or toggle the switch to vibrate mode to mute the camera.
Please note that in some regions, like Japan and South Korea, it may be illegal to turn off the shutter sound due to privacy concerns. In such regions, the shutter sound is designed to always be on, and there is no way to turn off the sound unless you jailbreak your iPhone, which can void your warranty or expose your device to security risks.