The law was changed to permit jamming in prisons. It is quite difficult to implement because you have to avoid jamming outside the prison, but a successful feasibility study was carried out. And the government decided it was too expensive to roll out nationally.

Yes, it is.

https://www.ofcom.org.uk/spectrum/interference-enforcement/s...

Criminal, according to Ofcom regulations.

https://www.ofcom.org.uk/spectrum/interference-enforcement/s...

There are after all good reasons to ban them, but even if those reasons didn’t exist, the Tories would ban them for their usual “law and order” reasons.

I don't know a tremendous amount about cell towers, but I was under the impression that they couldn't very accurately pinpoint locations - I was thinking more of a [foxhunting](https://en.wikipedia.org/wiki/Transmitter_hunting)-style location, where you could (hopefully) find a phone's hiding place with relative ease.

I guess they could use a "stingray" type device, which could be used to control, rather than interrupt the cell signal.

Rectal exams.

or just a faraday cage.

I suspect any quantity of metal sufficient to act as an RF shield or Faraday cage would be toxic to humans in paint form.