Andrew explained on 31/03/2018 :
Mobile phones modulate their output power to the lowest level
needed for communication. I believe this is why you should not
use your phone in a plane, because it tries maximum power.

Do smart meters carry out this same process ?.

Yes, exactly the same as a mobile phone would, but then not many people
sit with a meter next to their brain all day and RF's effect follows
the inverse square law.

Those most vocal at complaining about mobile masts, are often the ones
who make a lot of use of their mobiles. RF output from a phone is not
much less than that from a mast, but they are quite happy to put the
mobile next to their brain. The more masts there are, the less power
the phone needs to use to communicate with it, the lower the risk - yet
they complain about the health risks of living near a mast.