It was a different story in the U.S. for the 12-week period. In Apple's home market, iOS leaped from 21.5 percent a year ago to nearly 38 percent, while Android slipped from just over 66 percent to 57.5 percent. Apple also saw an increase in the U.K. (to 28 percent, up from 18 percent), and Android did, too (to 58 percent, up from 53 percent).Kantar expects the Apple growth trend to continue.
"While this latest data set only includes one week of iPhone 5 sales, we can see that in markets with a large number of existing Apple customers, sales have already seen a significant boost," Kantar's Dominic Sunnebo said in a statement. "We expect this momentum to be fully realized in the next set of results."