eMarketer:

Based on January 2017 usage data, the report found that UK women ages 25 to 54 with children in their households spent most of their time online (59%) via smartphone. By comparison, among women in that age group without children at home, the smartphone figure was a more modest 48%. The nonmothers spent comparatively more time on desktop computers (35%) than did the women with kids at home (26%).
 
 The device usage patterns were similar for men, with male parents of kids at home also overindexing for smartphone time spent online compared with child-free men in the UK ages 25 to 54.