I personally think that responsible smartphone use should be learned and practiced, rather than outright banning them.
I think this shows that adults are terribly addicted to their devices and think if they can’t stop using them, children won’t either. They certainly can’t teach how to use phones responsibly if they can’t do it themselves. Unfortunately for children the result is an outright ban.
UNESCO doesn’t bear any authority, so the answer would be “none at all” or something like that, I guess…
authoritarianism is an attitude. one can propose authoritarianism without being an authority.