I think this is what bothers me most about the policy actually. Nobody is arguing that children need access to smartphones during lessons, or even during the school day. The Government’s approach allows schools to achieve both objectives perfectly well: a genuinely phone-free school day and children having a means of communication while travelling to and from school. A device can be switched off, handed in or securely stored during school hours.
That’s why the point about SOS trackers bothers me more than the smartphone ban itself. If a parent says, “Fine, I accept that you don’t want smartphones in school, so I’ll give my 11-year-old a basic tracker/SOS device solely so that he can contact me in an emergency,” and even that is prohibited, then this is no longer simply about protecting children from social media, screen addiction, filming, messaging in lessons or other harms associated with smartphones. None of those things requires banning an emergency communication device on the journey.
And I don't really understand the “we managed before mobile phones” argument. Of course we did, but that doesn't establish that removing a safety measure available today makes children safer or more resilient. We also had payphones, staffed stations and other ways of contacting home. More importantly, being able to contact a parent and being able to solve a problem independently aren't mutually exclusive. A child can work out an alternative route during disruption and still have the ability to tell a parent where he is, or ask for help if the situation goes beyond what an 11-year-old can reasonably deal with.
Nor does the fact that nothing terrible has apparently happened prove that the precaution has no value. Emergency communication is there for unusual situations, not everyday ones. We don't normally assess a safety measure by saying that because the emergency hasn't happened yet, the measure isn't needed.
There is also an obvious proportionality point. If the concern is that a device might go off during a lesson, the direct solution is to require it to be switched off and inaccessible during the school day, with sanctions if that rule is broken. Banning the device from the child's journey altogether solves a much bigger problem than the one that actually needs solving.
So for me the distinction is quite simple: a phone-free school is one thing; requiring an 11-year-old to make a long journey across London without any means of contacting home is another. You don't have to accept the second in order to achieve the first.