I saw an old thread about this but rather than bump it I'm creating this new one. iPhone 4s iOS6 I just found this out, and it's not a big deal but it comes in handy. You can silence the camera's shutter sound simply by flicking the ringer switch to silent. Great for snapping a quick pic of somebody dozing on the couch, mouth open, drool running down their cheek. Also great for taking a photo of animals when you don't want to disturb them. There are other more nefarious uses but those are not worth discussing.