Mobile network Three has joined forces with TalkTalk, Sky, Vodafone, and other telecoms companies in the Fix Britain’s Internet campaign, aimed at pushing Ofcom to separate Openreach from BT.
The network has a focus on data in its plans, and says that to deliver good mobile broadband it must rely on "a competitive broadband infrastructure market" on the ground.
Three chief executive David Dyson said: "We have always focussed on providing the best mobile data experience and we are passionate about ensuring everyone has access to a high quality internet connection.
"Ofcom should play a crucial role in ensuring UK consumers fully benefit from the digital revolution yet Ofcom has allowed BT to accumulate close to 50% of the airwaves that are key to the mobile internet as well as dominating the fixed broadband market."
Three isn't the only company on board with the campaign, either. Fix Britain's Internet has also gained support from a number of telecoms and data firms, including XLN Telecom, Telcolnabox, Fluidata, and PER.
"British businesses are being impacted by Openreach's delays every single day," Simon Matthews of Fluidata said. "From unprepared engineers, to poor handovers and planning, these all affect our ability to provide the Ethernet service that will allow them to compete on a global scale."
More than 75,000 members of the public have shown their support for the campaign too, citing poor rural broadband coverage, delays from Openreach, and general slow services as their reason for backing an Openreach split.
Ofcom's consultation closes on Tuesday 4 October - the campaign urges anyone who wants to respond to do so now, or visit the Fix Britain's Internet website for more information.