You don't have children, do you? Being a know-it-all in an area you know nothing about. Denying a phone to one child is to isolate them among their peers. Denying it to all makes them equal again.

> Denying a phone to one child is to isolate them among their peers.

This is a worthy tradeoff if you genuinely believe social media to be as damaging for your child as you say it is.