According to the latest data from Nielsen, the iPhone accounted for 28.3 percent of the U.S. smartphone market in Q3. While Android as a whole accounted for a larger percentage of handsets—42.8 percent—no single phone manufacturer accounted for more than Apple, with HTC coming closest with 20.3 percent. Overall, iPhone and Android combined to account for 83 percent of all app downloads during the period, despite accounting for just 71…