More than a third of phones shipped in Japan are iPhones

"Apple Inc. boosted its share of the Japan mobile-phone market to more than a third after the country’s largest wireless carrier started selling the iPhone.
Apple boosted iPhone shipments in Japan to 36.6 percent of the market in the year ended March, up from 25.5 percent a year earlier, according to Tokyo-based MM Research Institute Ltd. The Cupertino, California-based smartphone maker shipped 14.43 million phones in Japan the past fiscal year, the researcher said."

Source:  Bloomberg, 13th May 2014