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For many years, we have watched TV episodes and movies debut future technology like this. For example, many of these episodes and movies show people talking on small, portable phones and having video conversations. Even The Jetsons cartoon in the 1970s had this as a future concept.
The iPhone makes that future thinking a reality today. There are a few apps that enable you to make video calls on your iPhone using the front-facing camera. At this time, only one app allows you to use both the front-facing camera and the rear camera: FaceTime.
FaceTime is the proprietary app highlighted in many Apple commercials for the iPhone. Essentially, FaceTime is free-over-Wi-Fi calling that allows you to see the caller on the other end of the conversation through the phone's front-facing camera.