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.
E. Nojavani, A. Rezaeezade, and Monadjemi. International Journal on Soft Computing, Artificial Intelligence and Applications (IJSCAI), 4 (1):
23 - 37(February 2015)