I need to find out whether this is possible on an iPhone 4S: while recording a video, is there anything the user can do (either accidentally or deliberately) to trigger the camera flash and the shutter sound effect, as if taking a photo? In a video I am analysing, taken by an iPhone 4S, a flash is seen partway through, and the shutter sound effect is heard. I need to ascertain whether there is any way this could have been triggered by the phone recording the video, or whether there was necessarily another camera or phone at the scene. As far as I understand the iPhone 4S *cannot* take a photo while recording a video, and indeed no photo corresponding to the moment the flash went off is found on the phone. This makes it hard to see how the flash and shutter effect could be triggered, but I would really love to be able to rule it out absolutely. Could anyone confirm that it is impossible to trigger the flash and shutter sound effect while recording a video? Many thanks!