The iPhone 4 will officially go on sale in China on Saturday, although it has been available in the gray market for some time now. The 16GB iPhone 4 will retail for RMB4,999 (US$745) and the 32GB iPhone 4 for RMB5,999 (US$894). iPhone 4 features FaceTime for video calling and a high resolution display working with a 5-megapixel camera with an LED flash. PC Magazine reports the company has an online store with more than 250,000 apps on offer, including the new iMovie app which was built for the iPhone 4. Which shows how mobile phones have massively widened their scope. The voice part of it is still important, vital; but it is now only one of many features of the modern mobile.