Apple iPhone 4 has two in-built cameras. One camera is located in the front above the display screen. While second camera is located at the phone back next to LED flash. Front camera is used for FaceTime feature as it has right field of view and focal length to focus on your face at arm’s length. You can easily switch between front and back cameras while making video calls.
How to Switch between front & back cameras
You can switch and use either of two cameras on iphone by tapping icon on right side (icon has camera logo with two revolving arrows around it). Tap on icon once to switch from front to back camera. You can tap icon again to revert from back to front camera on the iPhone device.