Their pivotal moment came when Greenwell shared a post on Instagram, proposing a shift in the social expectation surrounding smartphones. She invited others to join a pact promising to wait until at least the end of Year 9 (equivalent to eighth grade in the U.S.) before giving their children smartphones. The response was overwhelming; in just 24 hours, hundreds of parents joined the initiative, which now includes over 124,000 parents from more than 13,000 schools in Britain.

This movement reflects broader concerns in Britain regarding children's mental health. Surveys indicate that 69% of adults believe social media harms children under 15, and nearly half of parents struggle to manage screen time for their kids. Adding to the urgency, police reports highlight the increasing amount of extreme content available online, raising alarms about the potential psychological and societal effects on young users. Prime Minister Keir Starmer recently met with creators of the successful show "Adolescence," which tackles these issues, underscoring the need for collective efforts beyond governmental regulation.