Users of Apple Inc.'s iPhone 6 Plus are using twice as much data as those with the iPhone 6, according to a report from Citrix Systems Inc. The U.S. provider of workplace mobility technology said in a press release earlier this month that the bigger, 5.5-inch screens of the iPhone 6 Plus — compared to 4.7 inches for the regular iPhone 6 — leads more video viewing. Its report said that data usage on the iPhone 6 Plus is 10 times that of the iPhone 3GS. Citrix said in its report that the usage patterns of the iPhone 6 Plus are similar to that of tablets, and it presents an...