I strongly believe kids shouldn't have access to smartphones until they turn 18. Ideally this would be a legal mandate, which would help to reduce peer pressure. ("Everyone else at school has a smartphone!")
Practically, 11+ year olds are capable of getting their hands on anything they want if they have the money and inclination for it. And they certainly have the inclination to get a smartphone.
So the only way to achieve your vision would be to ban giving money to anybody under the age of 18.
If nothing else, it should spawn a new generation of young Irish hackers. For better or worse.
I know this dates me, but mobile phones weren’t a thing until I was at university, and they definitely weren’t smart.
I didn’t lead an impoverished childhood as a result, and information was still available to me through a desktop computer.