I don't know if they have a modular meter, but ones that use the actual power cables the meter is plugged into to provide the back end networking exist https://www.corinex.com/broadband-over-power-lines Surely these would be a better option than relying on a 3rd party mobile infrastructure?
Plus as 2g/3g get switched off some people may find that the remaining 4g/5g signal doesn't reach the location of their meter anymore since it might be in a basement or cupboard under the stairs and this will create additional problems.