Earlier quoted context omitted.
you can take a teen’s phone off them and they can just walk into a store and buy an inexpensive second hand handset and use the WiFi from a local cafe.
And if they do it with their own money, it's their phone. Children prior to 18 are not subhuman. If you're old enough to buy your own phone, you're old enough to decide whether and how to use it.
Of course, these are indeed good things in worlds that don't endorse physical violence as the primary method to enforce control. This is why Finland his tail docking, ear cropping, animal crating, corporal punishment, circumcision, etc bans and why the US South is so ruthless.