Will South Korea go back to banning phones in classrooms?

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those who use smartphones for more than four hours a day are more likely to develop mental health problems. Prolonged smartphone use was linked to a range of mental and physical issues, including neuropsychiatric disorders, insomnia, blurred vision and musculoskeletal disorders....were found to have higher levels of stress as well as higher rates of drug use, and were more likely to suffer from suicidal impulses

Qn: Do electronic devices, such as tablets or smart phones, help or hinder students in their studies? (Cam. 'O' lvl 2015)