Funny you should say that, my power company threatened to shut me off if I did not let them install a wireless reading electric meter. Hopefully they cannot shut THAT off.
They can. I have that type of meter. They snuck those in a few years ago before we found out the could be manipulated. But like you said, it's a cell signal. Pretty darned easy to block those signals.
But what really twists their nickers are folks like me with a whole house generator and an ATS (automatic transfer switch). The switch automatically turns the generator on and off based on power outages.
Mine's natural gas. But I understand it can be converted to propane. Thinking about having a good sized propane tank installed.
Here's a bit more on smart meters. The local gas company also installed smart meters. But no capability to shut off the flow. The water company installed them and now pays the gas company to piggyback on their network.
The goal of all three meters is primarily to do away with meter readers.