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UK: Almost a quarter of kids aged 5-7 have smartphones
(www.bbc.com)
This is a most excellent place for technology news and articles.
It is not hard. Just have a family app and you can set an allowance of total and for each app. Takes like 10 minutes to set up.
I know, but my point is that sort of parent has no desire to do so.
Either do I. But it's better to know what's going on and putting in the work. Your kids only benefit from it.