Chris Green wrote:

Andy Burns wrote:

As for claiming there is no mobile signal, the new generation smart
meters have options for non-mobile communication.

Which is?
Arqiva run a dedicated 423MHz smartmeter radio network in parts of the
country, and smart meters can use 869MHz mesh networking elsewhere, the
latter is probably short range so might only help to hop from neighbour
to neighbour

https://www.smartdcc.co.uk/document-centre/communications-hubs/communications-hub-product-information/