When demand emerges, the market will provide a solution and the internet is now awash with anti phone theft devices. Basic wrist straps are available on Amazon for a couple of quid, with more robust ‘retractable phone security tethers’ on offer for around £30. You can even get a body-worn strap system that looks like a bungee jump harness. Other options include ‘anti-snatch’ phone cases literally covered in spikes.

If you live or work in London, these defensive measures would........

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