The Daily Digit today is 27.4. With 27.4 million units shipped to operators worldwide in the fourth quarter of 2012, the Apple iPhone 5 captured the title of the world's best-selling smartphone from Samsung's Galaxy S3. That's according to research from consulting firm Strategy Analytics. In Q4, iPhone 5 boasted 13 percent share of all smartphones globally. Its older version, iPhone 4S, was second, with Apple distributing an estimated 17.4 million units around the world. .