Vodafone and EE are facing an Ofcom probe over claims they failed to provide accurate information about the coverage of their 3G and 4G networks.
Britain's telecoms regulator said yesterday it was launching a formal investigation after finding mistakes in both providers' coverage data.
The errors meant that EE had overstated its 3G coverage while Vodafone had underestimated the breadth of its 4G network, the regulator said.
Both companies, who are said to have made especially inaccurate statements about their coverage in rural areas, could be hit with huge fines.
Vodafone and EE are facing an Ofcom probe over claims they failed to provide accurate information about the coverage of their 3G and 4G networks (file photo)
The regulator said: 'Ofcom collects mobile coverage data from communication providers to inform our policy work and a range of research reports.
'This data is also widely used by other stakeholders.
'Mobile coverage data is also used to develop coverage maps and apps which, importantly, can help consumers to make informed