The latest numbers from ComScore show Apple strengthening its lead as the top US handset maker, with the iPhone nabbing an estimated 37.8 percent of the market as of January 2013. That's a 3.5-point boost from October of last year, putting healthy distance between Cupertino and the number-two smartphone maker, Samsung. That's not to say the Korean giant hasn't grown as well; its estimated 21.4-percent slice of the pie is up a more
