The aforementioned Nielsen Book survey found that the share of British households with at least one electronic tablet rose from 24% to 50% between 2012 and 2013. According to a 2020 Childwise report based on interviews with 2,200 British children between the ages of five and sixteen, young people today are highly dependent on their mobile phones. Most now get their first device at the age of seven. By the age of eleven, having a cell phone became almost universal. Among those aged seven to sixteen, the average time spent on the phone each day is three and a third hours. 57% said they went to bed with their phones beside them and 44% told the interviewers they felt "uncomfortable" in the absence of their phones. Due to the nature of this technology—cell phones are personal and private devices—it can be difficult for parents to monitor their children's activities and shield them from inappropriate contents.