South Korea's Samsung Electronics says its on the verge of selling its 10-millionth Galaxy S4 smartphone Samsung said it would probably reach that sales milestone next week, even though the S4 has been on sale for just a month. "It is selling much faster than the previous model S3," Shin Jong-kyun, Samsung's co-chief executive, said in Seoul. Last year's Galaxy S III was also quick to hit the 10-million mark although it took two full months, the Los Angeles Times reported. Total sales of the S III have reached 50 million, Samsung said.