Ofcom has varied the licences of the UK’s four mobile broadband operators in a bid to improve network coverage across the UK.
EE, O2, Three and Vodafone are now committed to providing voice coverage across 90 per cent of the UK’s landmass by the end of 2017.
This follows an agreement reached by the mobile providers with the government in December 2014.
As a result of the licence changes, Ofcom is to consult on the annual licence fees for the 900MHz and 1800MHz spectrum bands.
Back in 2010, the government directed the media regulator to revise these fees to reflect full market value after the completion of the 4G auction.
Ofcom said that helping to improve mobile coverage and quality of service are "important objectives" and it continues to make progress in respect of these aims.
The regulator - which published research on both mobile voice quality of service and mobile broadband speeds in 2014 - says it will release further mobile data this spring.
"This kind of research is designed to support consumers in choosing a service that best suits their needs, while helping promote competition between mobile operators on service quality," Ofcom stated.