iPhone has came to Chinese market by the help of Unicom and Apple but is without it's main key feature of Wi-Fi.
These iPhone available are without Wi-Fi and the next batch are expected to come with Wi-Fi. This is because it was temporarily banned by Beijing, which was promoting a rival Chinese system.
5 million iPhone 3G and 3Gs are supposed to be sell during the 3 years. It's very difficult for other multinational companies to enter Chinese market because of less costumers of those companies and Chinese themselves prefer to buy and use Local product.