Actually, a variation on that may be practical without it having the overbearing big brother aspect. Simply ban then for children. So one has to be over 18 to

Actually, a variation on that may be practical without it having the overbearing big brother aspect. Simply ban then for children. So one has to be over 18 to possess and/or use one. Anyone providing a smart phone to a minor would be treated in the same way as one providing alcohol to a minor. How one then deal with use in the home may be an issue, but no worse than the situation with kids taking alcohol at home. Here one is allowed to consume alcohol at home before one is an adult, it is the parents duty to be responsible.