To encourage the voluntary desegregation, districts started developing magnet schools to draw students to specialized schools all across their districts. Each magnet school would have a specialized curriculum that would draw students based on their interests.
Android holds the largest number of installed-base devices, with 1.9 billion in use in 2014, compared with 682 million iOS/Mac OS installed-base devices. Check out the link Android domination to continue in 2014; iPhone loses ground.
The year-over-year growth in the number of new smartphone users in the U.S. has grown rapidly in recent years. As the chart below illustrates, it grew from about 10-15 million new users per year to a peak of about 35 million in the fourth quarter of 2011.