Several years ago in our previous house an attempt was made to fit a smart meter. It failed due to very poor mobile signal.our best signal was upstairs so when I queried getting a signal booster ( I think EE would do it but we were not with them) the tech just had a blank look on his face. At the time businesses could install one in their premises but not private individuals. Radio frequency restrictions. We just had a newer meter fitted to replace the old one.
We currently don't have one but would if we fitted a better tafiff.
As for scam calls, we ignore any from unknown sources.
I used to answersome using the response...
Heddlu Dyfed Powys Police. Who is calling? That caused delayed reply and I'd respond with..calls to this number are being transferred to us as part of an investigation. Calls reduced as expected.
Current policy......unknown not answered and voicemail. Hardly any voucemail messages.