Global smartphone sales skyrocketed by 38 percent in the fourth quarter year over year. Meanwhile, Samsung ended 2012 in the top position for both smartphone sales and overall mobile phone sales, Gartner reported Wednesday. Even with the dramatic increase in smartphone sales in the fourth quarter, for the full year both smartphone and feature phone sales fell 1.7 percent from 2011 sales. Feature phone demand was weak, but record smartphone sales in the fourth quarter reached 207.7 million, up 38 percent from the fourth quarter of 2011.