The Galaxy S III has overtaken the Apple iPhone 4S for the first time ever to become the top selling smartphone for Q3 2012, according to Strategy Analytics. Samsung claimed the slot by shipped 18 million copies of its flagship handset during the quarter, compared to Cupertino's 16.2 million iPhone 4S units. Of course, serendipity is also likely at play, as the iPhone 5 came in towards the end of that period, likely cannibalizing 4S sales -- in fact, the market