EE, Virgin Media and Vodafone have all signed up to a voluntary code of practice in support of the open internet, the Broadband Stakeholder Group (BSG) has revealed.
Their decision means that all of the UK's major broadband providers have committed to the Open Internet Code, which was launched in 2012 to help safeguard net neutrality.
The self-regulatory model commits service providers to the provision of full and open internet access products.
It also confirms that traffic management practices will not be used to target and degrade the services of their rivals.
A number of broadband providers including BT, Sky, O2, Three, TalkTalk, Plusnet and KCOM had previously signed up to the code.
Until now, the trio of other service providers - EE, Virgin Media and Vodafone - had held off from doing so.
Matthew Evans, Chief Executive of the BSG, which initiated the Open Internet Code, said that, unlike some countries where net neutrality has become "a controversial topic for discussion", the UK benefits from "a fiercely competitive market and high levels of transparency".
"The code now provides an even stronger and more effective foundation, whilst also allowing for an environment where new business models for internet-based services which benefit consumer choice can thrive," he stated.
Jo Connell, Chair of the Communications Consumer Panel, said the code "usefully supports" open access to the internet and builds on previous commitments by service providers to provide transparent information to consumers about their traffic management policies.
"We are delighted that EE, Virgin Media and Vodafone have now agreed to become signatories," she added.
"The code has gained significant interest internationally as a positive example of industry responding to a developing consumer need."