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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.
Beyond the proven addictive effects of handing a dopamine device to your kid, there are legal ramifications many parents aren't aware of.
WhatsApp and TikTok aren't just there like air, free for all to consume. They are service providers and both sides are bound by a contract, the EULA. IIRC, WhatsApp recently reduced it minimum age from 16 to 12. So if you install WhatsApp on your 8 year old's phone, you have broken the contract.
The only ramification being that they close the account if they find out. No one is getting arrested, getting a fine, or even going to court.