The iPhone is currently the best-selling smartphone in Japan, at least at retail, according to a recent survey. Gathered by research firm BCN, data from 2,300 stores shows the 8GB iPhone 3G as the most popular smartphone, followed by its 16GB sibling. Ranking third in the survey is the NTT DoCoMo Aquos SH-04A, designed by Sharp; RIM's BlackBerry Bold ranks sixth, and a full four slots in the lis