Survey: Smartphone adoption according to country and sex3
According to this study, it's only relevant for the young people in Italy that the percent of smartphone adoption (53%) is bigger than the percent of feature phone adoption (47%). Anywhere else, the feature phones are winning among people aged 15-24 - with 62% to 38% in Spain, 64% to 34% in the UK and 67% to 33% in the USA. As for the sexes, the smartphone adoption among the ladies is more prevalent only in the US (55% to 45%) with India at the end of the pack in this category - there, of all young people with smartphones, 80% are boys.
source: Nielsen via Into Mobile