USA Power SMART meters uses sub-ghz radio in a mesh network and sends meter ID and counter on the clear by radio waves on more or less 900mhz …
Some info : https://www.youtube.com/@RECESSIM/videos
It would be very cool to have an application on flipper like the weather station or the tier pressure application that would intercepr radio signal from smart metter and decode the info that it sends.
Well in my country they are not using radio so i would be out of luck yet it would still be very cool to have this sort of facility/app on flipper.