Hi Walter S
Found this Martin Lewis related article. Summary, says Over Four Million meters are faulty, only 61% of houses have them
Some willing to pay more, to Not have one! what.... one chap had a bill for £39000
https://www.msn.com/en-gb/money/other/martin-lewis-warns-ed-miliband-over-perverse-smart-meter-rollout/ar-AA1qI8R5?ocid=mailsignout
https://www.msn.com/en-gb/money/other/martin-lewis-raises-important-flaw-in-smart-metres-as-he-hits-out-at-ed-miliband/ar-AA1qHvkA?ocid=mailsignout

Becoming a farce, meters installed by people with little training, wrong polarity, some catching fire, some not reading correctly
(Watch out for dodgy adverts on these msn pages, like the one for the £49 energy saving fan heater, Yes saves energy, it's only 500W)

Another link, says about the 198khz Long wave Radio 4 switch off, with its teleswitch signal
https://www.msn.com/en-gb/money/other/swindon-households-with-old-energy-meters-urged-to-switch/ar-AA1qIkMC?ocid=mailsignout
I like how they make it so simple, One click, all done, what could possibly go wrong?....Lots
So No, they don't cause RFI, being mobile phone linked, but may cause you other problems

Rod Watts