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EE warns parents against giving children under 11 a smartphone
(www.theguardian.com)
This is a most excellent place for technology news and articles.
You can find older Apple Watches for fairly cheap, I paid 10 bucks a month on T-Mobile for just the watch plan.
You would need to have an iPhone in order to manage it but you can manage a watch for a kid that way. They have school mode for them so it just acts as a watch with emergency contact action at school.