We had video chat before the iPhone. It's part of the UMTS standard and was one of the major selling points when the carriers rolled it out in the early 2000's. I don't know much about its technical merits, it would surprise me if it was any good using today's standards, but it was cross platform and could have been built upon if the two new mobile OS makers had been interested. But since the iPhone didn't even have UMTS when it was launched it's no surprise Apple didn't include support for it.