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In a hyper-connected world what are smartphones doing to us and our children? We hear from father Tim Farnum who noticed his children became withdrawn and moody after getting their smartphones. It moved him to set up PAUS - Parents Against Underage Smartphones - which is campaigning to get sales of smartphones banned for under 13s in Colorado, USA. But is this technology really to blame for mood changes in young people? Psychologist Jean Twenge shares the findings of her latest book about mental health and smartphone use in our youngest generation.

Plus, what do children have to say about their own phone habits? We hear from five 12-year-old students at 'School 21' in London. And finally, Hawaii has passed a law which will fine people for looking at their phones whilst crossing the road. Brandon Elephante of Honolulu council tells us why he proposed the law.

(Picture: boys using smartphones, Credit: Getty Images)