Nielsen’s third quarter survey of mobile users reveals that while only 43 percent of all US mobile phone subscribers own a smartphone, 62 percent of mobile adults aged 25-34 report owning smartphones. And among those 18-24 and 35-44 years old the smartphone penetration rate is hovering near 54 percent.
S. Rayate, R. Bhamare, K. Barhate, and M. Sonawane. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (1):
123--126(January 2015)
L. Roalter, A. Möller, S. Diewald, and M. Kranz. Proceedings of the 7th International Conference on Intelligent Environments (IE), page 214--221. (July 2011)
S. Diewald, L. Roalter, A. Möller, and M. Kranz. Proceedings of the 10th International Conference on Mobile and Ubiquitous Multimedia, page 73--80. New York, NY, USA, ACM, (December 2011)