- The Advertising Standards Authority sets rules on when broadband can be advertised as unlimited.
- An unlimited service should not impose a hard data cap that a typical user would reach.
- Any traffic management or fair usage restrictions on an unlimited service should be limited and clearly disclosed.
- Most fixed home broadband in the UK is genuinely unlimited for normal use.
- Ofcom requires transparency about traffic management and usage limits before a contract is agreed.
In the UK, unlimited broadband should have no hard data cap a typical user would hit, with any restrictions limited and disclosed. The ASA governs the term, and most fixed home broadband is genuinely unlimited.
Last reviewed: June 2026
What unlimited should mean
The word unlimited appears on most broadband advertising, and it carries a specific meaning under UK advertising rules. In broad terms, a service advertised as unlimited should not impose a hard data cap that a typical user would reach, and any restrictions such as traffic management should be limited and clearly disclosed. This prevents the word from being used for a service that in practice limits normal use. Understanding what unlimited should mean helps a household read adverts critically and compare offers on a fair basis.
For most fixed home broadband in the UK, unlimited is genuine: there is no cap that ordinary use, however heavy, would hit. The nuances arise mainly with some mobile plans and with the detail of any fair usage or traffic management policies.
The ASA rules on unlimited
The Advertising Standards Authority, which regulates advertising, sets rules on when the word unlimited can be used for broadband. These rules are designed so that an unlimited claim reflects reality. In essence, a service should not carry a hard data cap that a typical user would encounter, and any traffic management that does apply should be moderate and not so restrictive that it undermines the unlimited claim. Where a provider applies meaningful restrictions, the advertising must make this clear. The ASA can act against advertising that uses unlimited misleadingly, which gives the rules force.
| Requirement | What it means | Set by |
|---|---|---|
| No typical-user cap | No hard limit a normal user would reach | ASA advertising rules |
| Limited restrictions | Any management must be moderate | ASA advertising rules |
| Clear disclosure | Restrictions must be made clear | Ofcom and ASA |
| Transparency before sale | Limits disclosed before contract | Ofcom rules |
Traffic management on unlimited plans
An unlimited service can still apply some traffic management, but it must be limited and disclosed. Traffic management shapes how different traffic is handled, for example by keeping interactive activities responsive at busy times. On a genuinely unlimited plan, any such management should not amount to a backdoor limit on normal use. Ofcom requires providers to be transparent about traffic management, so a household can check what, if anything, applies. In practice, many modern fixed networks apply little active management, relying on capacity instead, so unlimited plans on these networks behave straightforwardly.
Fair usage and unlimited
Some unlimited plans, particularly on mobile, include a fair usage policy that allows the provider to manage exceptional or extreme use. This is different from a hard cap: it does not limit normal use but addresses use so heavy that it affects others. For ordinary households, a fair usage policy on an unlimited plan rarely has any effect. The key is to read the policy to confirm that it targets only extreme use rather than imposing a practical limit. On fixed home broadband, fair usage caveats are generally light or absent.
Unlimited on fixed versus mobile
The reality of unlimited differs between fixed and mobile broadband. Fixed home broadband sold as unlimited is typically genuinely unlimited for normal use, because fixed networks are built for sustained household demand. Mobile broadband shares more constrained radio capacity, so unlimited mobile plans more often carry fair usage or tethering terms. Anyone considering mobile broadband as a home connection should read these terms closely, since the practical meaning of unlimited can be more qualified than on a fixed line. The distinction matters most for households relying on mobile for home use.
How to compare unlimited claims
Because unlimited is widely used, comparing plans means looking past the word to the detail. The key questions are whether there is any hard data cap, whether traffic management is applied and on what basis, and whether a fair usage policy targets only extreme use. Ofcom transparency rules require this information to be available, so it can be checked before committing. Comparing the underlying terms, rather than the unlimited label alone, reveals whether two unlimited plans are genuinely equivalent or whether one carries more restrictions than the other.
Are there truly unlimited plans
For practical purposes, most fixed home broadband plans are truly unlimited: there is no cap a household would hit, and any management is light and disclosed. The question is more nuanced on mobile, where unlimited plans exist but more often carry fair usage terms. The honest summary is that genuinely unlimited fixed broadband is the norm, while unlimited mobile broadband is usually unlimited for most users but may manage extreme use. Reading the terms confirms which kind a specific plan is, but the headline reassurance for fixed broadband is that unlimited generally means what it says.
What the ASA says about advertising
The ASA's position is that advertising must not mislead, and the rules on unlimited reflect this. A provider cannot advertise a service as unlimited if it carries a cap a typical user would reach, or if restrictions are heavy enough to contradict the claim. Where the ASA finds advertising misleading, it can require it to be changed or withdrawn. This regulatory backing is why the word unlimited in UK broadband advertising generally carries real meaning, and why households can rely on it more than they might assume, particularly for fixed home broadband.
The bottom line for households
In summary, unlimited broadband in the UK should mean no hard cap a typical user would hit, with any restrictions limited and disclosed, backed by ASA rules and Ofcom transparency requirements. Most fixed home broadband is genuinely unlimited for normal use, while unlimited mobile plans more often carry fair usage terms worth reading. Comparing the underlying terms rather than the label, and checking the disclosed information, ensures a household gets the genuinely unlimited service it expects without hidden restrictions.
Frequently Asked Questions
Is all unlimited broadband the same?
Not exactly. Most fixed home broadband sold as unlimited is genuinely unlimited for normal use, while unlimited mobile plans more often carry fair usage or tethering terms. The differences lie in the detail of any traffic management and fair usage policies, so comparing the underlying terms rather than the label shows whether two unlimited plans are equivalent.
Can an ISP throttle unlimited broadband?
An unlimited service can apply some traffic management, but it must be limited and disclosed, and should not amount to a backdoor limit on normal use. Ofcom requires transparency about traffic management. Many modern fixed networks apply little active management, so unlimited plans on them generally behave straightforwardly for ordinary households.
What should an unlimited broadband policy disclose?
Under Ofcom transparency rules, a provider should disclose any traffic management practices and usage limits before a contract is agreed, including how and when management applies and any fair usage terms. This lets a household confirm that an unlimited plan has no hard cap and that any restrictions target only extreme use.
Are there any truly unlimited broadband packages?
Most fixed home broadband packages are truly unlimited for practical purposes, with no cap a household would hit and only light, disclosed management. On mobile, unlimited plans exist but more often manage extreme use through fair usage. Reading the terms confirms which kind a plan is, but genuinely unlimited fixed broadband is the norm.
What does the ASA say about unlimited broadband advertising?
The Advertising Standards Authority sets rules so that an unlimited claim reflects reality: a service should not carry a hard cap a typical user would reach, and any restrictions should be moderate and disclosed. The ASA can require misleading advertising to be changed or withdrawn, which gives the rules force.
Does unlimited mean the same on mobile and home broadband?
Often not. Fixed home broadband sold as unlimited is typically genuinely unlimited for normal use, while unlimited mobile plans share more constrained capacity and more often carry fair usage or tethering terms. Anyone using mobile broadband at home should read these terms, as the practical meaning of unlimited can be more qualified on mobile.
