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The new National Grid smart meters also have a roaming SIM so they can pick up the strongest nearby mobile network to transmit energy usage information to energy companies from any location, rather than being restricted to one mobile network.
To demonstrate his attack, Davis crafted a piece of malware that could self-replicate to other meters, allowing an attacker to shut them down remotely. In simulations, Davis showed that if his worm were released in an area where all the houses were equipped with the same brand of meter, the worm could spread to 15,000 homes in the space of 24 hours.