Where do you draw the line though? Why should the responsible parents (and their children) be penalised for the failings of the others?
I don't agree with an overall ban - except in schools (which is what our eldest's school effectively has), but that's no different to banning handheld video games, comics, card games, or any other distractions which would prevent them learning. The distraction is the problem, not the fact it's a phone.
I do think some things are required:
Age restrictions on social media (16 or 18, not sure which to be honest) which must be verified with government issued ID (e.g. driving licence l, birth certificate or passport).
Standardised filtering/parental control software, currently every ISP router, games console, mobile phone OS, desktop PC etc. has a different set of software.
For those of us who are technical, it's a pain, but useable. For non-technical people, I can understand why they might get lost in it and just not bother. E.g. my son has an android phone, switch and PC, they each have their own apps, set of controls, which makes setting screen time a pain. E.g. if we want him to be allowed an hour of screen time, we can't set that across all devices, each device has its own counter.
Would consider writing my own, but (understandably) the APIs for device control aren't very accessible.
It's probably pie in the sky thinking - the govt. doesn't exactly have a great track record, and there's too much competition in the market for any single piece of software to become standardised