If you want a super-steady shot from your iPhone's camera or want to take a picture of yourself from a tripod, you can easily use the volume button on your iPhone's headset to take a picture.  There's a way to use the headset that comes with your iPhone as a tethered shutter release for your phone's camera. you can put your iPhone on a DIY tripod and take a picture of you and your friends from far away, or without your hands muddying up the shot.