BT, O2 and TalkTalk are among several leading internet service providers (ISPs) to have signed up to a new Open Internet Code but several notable firms have refused to take part.
The code, put together at the request of the government by the Broadband Stakeholders Group (BSG), is designed to ensure information on how internet service providers (ISPs) deliver access to the internet in a clear and open manner.
The code calls on signatories to ensure no services are blocked on their networks, to provide clarity in instances where content is blocked on legal grounds so users are informed, and ensure the delivery of rivals' content or applications is not degraded.
Internet minister, Ed Vaizey, welcomed the code, arguing it was vital step forward in ensuring the internet remained open for the benefit of consumers.
"This voluntary agreement is great news for consumers. It marks a significant commitment from the leading ISPs to uphold the principles of an open internet and gives certainty to their customers," he said.
"The internet has been built on openness and low barriers to entry, and this agreement will ensure that continues. By committing to transparency, these ISPs are empowering their customers to make informed decisions about the services they want."
As well as BT, O2 and TalkTalk, BE, BSkyB, KCOM, giffgaff, Plusnet, Three and Tesco Mobile have also signed up to the code.
However, notable absentees include Vodafone, Everything Everywhere and Virgin Media, who said the code was misleading.
"These principles remain open to misinterpretation and potential exploitation. We will be seeking greater certainty before we consider signing," said a Virgin Media representative.
Comcast's £29.7bn winning bid more than twice the £13.7bn Rupert Murdoch valued Sky at just eight years ago
A nuclear strike has been considered, but Bruce Willis is nowhere in sight
Spray-on antenna could enable seamless integration of antennas with everyday objects
Parker Solar Probe, TESS and GOLD missions will deliver exciting data, claims NASA