Vodafone and CityFibre have confirmed they are to deploy full-fibre broadband infrastructure in Coventry, Edinburgh, Huddersfield and Stirling.
In November last year, the two firms announced a long-term strategic partnership that will lead to up to five million premises having access to ultrafast broadband by 2025.
The first phase will see fibre-to-the-premises technology - which is currently only available to around three per cent of UK premises - being deployed to one million homes and businesses over three years.
Vodafone and CityFibre will then have the option of extending the commercial terms of their agreement to reach a further four million premises by 2025.
The latest announcement follows confirmation that the two companies will deploy full-fibre broadband in Milton Keynes, Peterborough and Aberdeen.
This brings the total number of premises identified so far to more than half a million homes and businesses across seven cities.
Nick Jeffery, Chief Executive of Vodafone UK, said he is "delighted" that people living in Coventry, Edinburgh, Huddersfield and Stirling are joining the "full-fibre club, with a broadband service like no other".
"After five months, we are well on track with the joint Gigafast broadband programme that will help position the UK as a world-leading digital centre," he commented.
Greg Mesch, Chief Executive of CityFibre, added that this commitment will "totally transform each city in which we roll out by bringing ubiquitous full-fibre to everyone."
"We are well on our way," he stated.