Since going on sale last April, Samsung has moved some five million Galaxy S II units in its native South Korea. According to the company, that number means that roughly one in every four phone owners in the country now rocks the popular handset, enough for the company to unofficially declare it the nation's "national smartphone," a fact that's pretty tough to deny, given that South Korea's total population is somewhere in the ballpark of 49 million. All in all, not a bad haul for a handset that launched around nine months ago.