On LG Omtimus G you get to select a shutter sound from 4 available tones, or you can completely remove the sound and take shots silently. Turn off shutter sound on Optimus G camera, by doing as follows:
1. Open Camera application
2. Press the Gear icon to go the the Settings.
3. Scroll down and tap "Shutter Sound"
4. Select OFF to disable/turn off shutter sound, or select one of the tones as the shutter sound on the LG Optimus G