Apple's share of the smartphone market dropped in the second quarter to its lowest level in three years, research firm Strategy Analytics said. The share of the iPhone slipped to 13.6 percent in the quarter from 16.6 percent in the same quarter last year. The largest vendor Samsung Electronics, however, saw its share soar to over 33 percent from over 31 percent in the same period. Samsung shipped over two times the number of smartphones Apple did in the quarter, Strategy Analytics said.