When I got my iPhone 3Gs, I didn’t know how to hold it while shooting video. At first, I held it vertically, the same way as when making a phone call.
I soon realized that that wasn’t the RIGHT way to hold the phone/camera. Do you shoot video with your iPhone? If you own a 3Gs or a 4G, there is a right and wrong way to do it.
Also watch: How to rotate your video 90 degrees.