I read an article dealing with Smartphone addiction is gettling younger age. I was interested in this article because Korea was mentioned several times to refer the seriousness of smart phone addiction.
According to the article, out of 1,000 Korean students, 72% of children own a smartphone by the age of 11-12, spend 5.4 hours a day, and 25% of them are considered addicted. It also mentions that stress is a strong indicator to smartphone addiciton.
Due to the fact that Korea is high competitive society, children suffer from big pressure from early age. They are forced to study, to find out their strength, and to work on it.
I know parents allow their children to use electronic devices hoping their children will grow up as a technology friendly kids. However in order to guarantee their happy childhood memory, strong regulation is necessary rather than just leaving them to do whatever they want. I would lilke to recommend two hours of screen time for kindergarten kids. Three hours for primary students, four hours for above. No excuses even if it is for educational purpose. I am sure that kids can always learn more off line.