Mobile Phone Banned in School

Today, my daughter got home from school.
She told me that her iPhone had no signal while on campus and could only connected to a specific WiFi network, which blocked almost every social apps (Facebook, WhatsApp, Instagram, etc.).
She said this was unfair and an insult to human rights.

I calmed her down.

But frankly, I support this mobile phone ban.
My daughter spends too much time on her phone.

Schools in China should follow this policy.