Well there are a few reasons. 1. Space. Adding another camera would mean they would have to do something on inside to add another stupid camera. 2. Cost. No, not for Apple. How bout using the service? Video calling isn't free people. It's going to cost money and then people will complain that they have to pay even more to use another feature on the iPhone. 3. The iPhone is a smartphone (at least that's how I see it), and there is no other smartphone, such as a Blackberry, that even has this feature. If you wanna do video chat, you have skype for that. People are asking for way too much in a phone.