Data vendor MM Research Institute tracked smartphone sales in Japan and discovered the iPhone is greatly outselling its competitors, says a report in Computerworld. According to the company's analysis, about 24.2 million smartphones were shipped in Japan and 30 percent were iPhones. This compares to Samsung which accounted for only 8.3 percent of the total smartphone shipments in the country. Most of Apple's success in the island nation is attributed to the iPhone 4S which is sold by Au and Softbank.