Ofcom isn’t happy with EE and Vodafone’s coverage predictions

UK telecoms regulator Ofcom has opened separate investigations into coverage predictions offered up by EE and Vodafone.
In what seems like a fairly pedantic move Ofcom has announced it’s looking into information provided by the two MNOs when it asked them to say how much of the country they expect to cover. Bizarrely EE is suspected of overestimating its 3G coverage, while Vodafone may have under-predicted its 4G coverage.
Why any of this matters is unclear. Ofcom uses these estimates for