- A fair usage policy sets out limits or management that may apply to heavy use, even on packages described as unlimited.
- Ofcom rules require providers to be transparent about traffic management and any usage limits before a contract is agreed.
- Most fixed home broadband is sold as unlimited, with fair usage caveats more common on mobile and some legacy products.
- Traffic management can prioritise or slow certain traffic types, particularly at peak times, where a policy allows it.
- The Advertising Standards Authority sets rules on how the word unlimited can be used in broadband advertising.
A fair usage policy sets out how a provider may manage heavy or unusual use, even on unlimited packages. Ofcom requires this to be disclosed clearly, and the ASA limits how the word unlimited can be advertised.
Last reviewed: June 2026
What a fair usage policy is
A fair usage policy is the part of a broadband contract that describes how a provider may manage usage that is unusually heavy or that affects other customers. The idea is to protect the shared network so that a small number of very intensive users do not degrade the service for everyone else. A fair usage policy can take several forms, from traffic management at peak times to limits on certain activities, and on some products it may include a usage threshold beyond which conditions change.
For most modern fixed home broadband sold as unlimited, fair usage rarely affects ordinary households, because typical use sits well within any limits. The policy matters most for very heavy users and is more commonly felt on mobile and some legacy products. Even so, knowing that a policy exists, and what it says, helps avoid surprises.
Why fair usage exists
Consumer broadband is a shared, contended service, where network capacity is divided among many users. Because capacity is finite at any moment, providers reserve the ability to manage exceptional use that would otherwise harm the experience of others. Fair usage policies are the contractual expression of this. They allow a provider to act where one connection's behaviour is so heavy or unusual that it threatens the shared service, rather than leaving the network unprotected.
This is a different thing from an ordinary household using a lot of data. Streaming, gaming, downloads and home working across a family can add up to large monthly totals without coming close to triggering a fair usage concern, because that pattern is exactly what the network is built to carry.
What unlimited really means
The word unlimited is widely used in broadband advertising, and the Advertising Standards Authority sets rules on when it can be applied. In broad terms, a service advertised as unlimited should not impose a hard data cap that a normal user would hit, and any traffic management or fair usage restrictions should be limited and clearly disclosed. This is why genuinely unlimited fixed broadband is common, while the term carries more caveats on some mobile products. Reading the fair usage policy alongside the unlimited claim shows exactly what, if anything, applies.
| Connection type | Typical fair usage approach | Effect on normal use |
|---|---|---|
| Fixed home broadband | Often light or no active management | Rarely noticeable |
| Mobile broadband | Fair usage and tethering terms more common | Can affect heavy home use |
| Legacy or budget products | More likely to include thresholds | Possible at very high usage |
| Business connections | Defined service terms, often uncontended | Designed for sustained use |
Traffic management and peak times
One way a fair usage policy can operate is through traffic management, where a provider shapes how different types of traffic are handled, particularly at busy times. A policy might, for example, allow certain very heavy transfers to be slowed during peak hours so that interactive activities such as browsing and video calls remain responsive for everyone. Where a provider uses traffic management, Ofcom rules require it to be disclosed so that customers understand what may happen and when.
In practice, many providers apply little or no active traffic management on modern fixed networks, relying instead on building enough capacity. Where management is used, it is usually targeted at exceptional cases rather than ordinary use, and the policy should set out the circumstances clearly.
Ofcom transparency rules
Ofcom requires providers to give clear information about their services before a contract is agreed, including any traffic management practices and usage limits. This transparency requirement means a household should be able to find out, in advance, whether a package applies any fair usage restrictions, what they are, and when they take effect. The aim is to ensure that the word unlimited and the reality of the service match, and that customers can compare offers on a fair basis.
These rules sit alongside the broader consumer protections Ofcom oversees, such as clear contract information and the right to exit where a provider makes certain changes. Together they are designed to prevent hidden restrictions from undermining an advertised service.
How to find your policy
A provider's fair usage policy is usually available in the contract terms and on the provider's website, often linked from the package details. The key things to look for are whether any data threshold applies, whether traffic management is used and on what basis, and what the provider may do if usage is judged excessive. For most households the answers will confirm that ordinary use is unaffected, but for very heavy users, or those choosing a mobile or legacy product, the detail is worth reading before signing up.
Fair usage on mobile and home broadband compared
The practical weight of a fair usage policy differs between fixed and mobile services. Fixed home broadband sold as unlimited typically carries light or no active restrictions for normal use, because the network is built for sustained household demand. Mobile broadband, which shares radio capacity that is more constrained, more often features fair usage terms, tethering limits or speed management, even on plans described as unlimited. Households considering mobile broadband as a home connection should pay particular attention to the fair usage and tethering terms, since these shape how the service behaves in heavy home use.
What it means for households
For the great majority of households, a fair usage policy is reassurance rather than a constraint: it protects the shared network without affecting normal use. The exceptions are very heavy users and those relying on mobile or older products, for whom the detail can matter. Reading the policy, checking it against the unlimited claim, and using the Ofcom transparency rules to compare offers ensures the service bought matches the service expected, with no hidden restrictions waiting to surprise the user later.
Frequently Asked Questions
Is unlimited broadband really unlimited?
Most fixed home broadband sold as unlimited carries no hard data cap that a normal household would hit, and the Advertising Standards Authority limits when the word unlimited can be used. Any traffic management or fair usage restrictions should be limited and clearly disclosed. Reading the fair usage policy alongside the unlimited claim shows exactly what applies.
Can an ISP throttle my connection for heavy use?
Where a fair usage policy allows it, a provider may manage exceptional or very heavy use, for example by slowing certain transfers at peak times. Ofcom rules require any such traffic management to be disclosed. For ordinary household use, this rarely applies, as typical use sits well within any limits.
What is traffic management?
Traffic management is the practice of shaping how different types of traffic are handled, particularly at busy times, for example by prioritising interactive activities. Where a provider uses it, Ofcom rules require it to be disclosed so customers understand what may happen and when. Many modern fixed networks apply little active management.
How do I know if fair usage applies to my package?
A provider's fair usage policy is usually set out in the contract terms and on its website, linked from the package details. It should state whether any data threshold applies, whether traffic management is used, and what the provider may do if usage is judged excessive. Ofcom requires this information to be available before signing up.
What should a fair usage policy disclose under Ofcom rules?
Ofcom requires providers to give clear information before a contract is agreed, including any traffic management practices and usage limits. A fair usage policy should therefore disclose any thresholds, how and when traffic management is applied, and what action the provider may take, so that the service matches its advertised description.
Does fair usage affect mobile broadband more than home broadband?
Often, yes. Fixed home broadband sold as unlimited typically carries light or no active restrictions for normal use, while mobile broadband shares more constrained radio capacity and more often features fair usage terms, tethering limits or speed management. Those using mobile broadband at home should read these terms carefully.
