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What happens when a school bans smartphones? A complete transformation | US education | The Guardian
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I lent my 8yo my old phone, heavily restricted and with Family Link installed; She's only allowed 2 hours a day and isn't allowed on stuff like YouTube. There are ways to do it responsibly.
There are a few things to consider.
She's just 8, so you have an easier time controlling what she does (I say this with the experience of rising 2 children to adulthood)
She might not be susceptible to these things
You just might be a better parent for any arbitrary reason
So as an anecdote your situation is valuable, but as a guideline to how the whole society should handle this problem possibly not so much.