Re-posting an older comment of mine on the subject:

Here's a couple of arguments I had to deal with whilst expressing my support for electronics ban at schools including a blanket social media ban:

1) "Since when do we consider it OK for the government to intervene between the parents and their children and telling them whats good and whats not? They know best."

2) "Whoever does not want to use electronics at school grounds are free to do so who are we to constrain them? Also, forbidding things never works let them learn."

3) "I think you are underestimating children; if they see that what they are doing with electronics affects them in any way, they will stop using them. Lets give them some credit and let them make their mistakes."

All of which are anti phone-ban/anti-regulation/pro-liberal/freemarketeering masquerading as a product of independent thought.