nine in 10 children own a mobile phone by the time they reach the age of 11.three in five secondary school-aged children have been contacted online in a way that potentially made them feel uncomfortable.almost three-quarters of teenagers between age 13 and 17 have encountered one or more potential harms online.three-quarters of social media users aged between eight and 17 have their own account or profile on at least one of the large platforms.despite most platforms having a minimum age of 13, six in 10 children aged 8 to 12 who use them are signed up with their own profile.