The Apple iPhone X made its debut during the fourth quarter of 2017. The tenth anniversary model launched during the first week of November, which helped Apple’s U.S. market share rise sequentially by 10 percentage points during the last three months of the year. For the period, the iPhone saw its share of the stateside smartphone market rise to 39% from 29% during the third quarter. On a year-over-year basis, the iPhone’s Q4 market share was up 5 percentage points (17%) from the 34% it achieved in Q4 2016.
Apple had a seven percentage point lead over Samsung from October through the end …