Many broadband packages advertise unlimited data — however some have fair usage policies buried in the small print that can slow your connection or result in extra charges. Here is everything you need to know.
In this guide
What is a fair usage policy?
A fair usage policy (FUP) is a set of rules in your broadband contract that limits how much data you can use — or how you can use it — even on packages advertised as unlimited. Furthermore fair usage policies are designed to prevent a small number of very heavy users from congesting the network and slowing speeds for everyone else.
Fair usage policies vary significantly between providers. Some set a specific data limit — for example 1TB per month — while others use vaguer language about excessive use. Consequently it is important to read the small print before signing up to any broadband deal.
Why it matters: If you exceed your provider’s fair usage threshold your speeds may be reduced — sometimes significantly — for the rest of the billing period. Additionally in some cases your provider may contact you or charge extra fees. Consequently understanding your fair usage policy before you sign up can save you from a frustrating experience.
Does unlimited really mean unlimited?
Not always. The word unlimited in a broadband deal means there is no hard data cap — you will not be cut off or charged per gigabyte once you hit a limit. However it does not necessarily mean you can use as much data as you like without any consequences.
Furthermore the Advertising Standards Authority (ASA) has tightened rules on the use of the word unlimited in broadband advertising. Consequently providers must now be clearer about any restrictions that apply. However fair usage policies can still be buried in the terms and conditions rather than prominently displayed.
Truly unlimited
No data cap at all
No speed throttling at any usage level
No fair usage policy in the terms
Unlimited with FUP
No hard data cap
Speed may be reduced if usage is excessive
Fair usage threshold in the terms and conditions
How is a fair usage policy enforced?
Providers enforce fair usage policies in several ways depending on the terms of your specific contract. Furthermore enforcement typically only kicks in if your usage is significantly above average:
🐢 Speed throttling — your connection is slowed down after you exceed the threshold. Consequently download speeds may drop significantly for the rest of the month.
📧 Warning contact — your provider contacts you by email or letter to warn you that your usage is approaching or has exceeded the fair usage threshold
💰 Extra charges — less common on home broadband but some providers charge for usage above a certain level
⏰ Time-based throttling — some providers reduce speeds only during peak hours rather than all the time. Consequently you may experience slower speeds in the evening but normal speeds overnight
What is traffic throttling?
Traffic throttling — sometimes called traffic shaping or bandwidth throttling — is when your provider deliberately reduces your internet speed. It is the most common way fair usage policies are enforced. Furthermore throttling can affect your entire connection or just specific types of traffic.
Some providers throttle specific types of traffic rather than overall speed — for example peer-to-peer file sharing or video streaming may be slowed while general web browsing remains unaffected. Consequently throttling can sometimes be difficult to notice unless you are trying to do a specific activity.
How to tell if you’re being throttled: Run a broadband speed test at different times of day. Additionally try running the test while downloading a large file. If your speed drops dramatically during certain activities or at certain times throttling may be the cause. Compare your results to the speeds guaranteed in your contract.
Will a fair usage policy affect me?
For most households the answer is no — the average UK household uses around 350-500GB of data per month and most fair usage thresholds are set significantly above this level. Consequently casual browsing, streaming and working from home rarely triggers a fair usage policy.
However some households are at higher risk of hitting fair usage limits:
🎮 Heavy gamers — downloading large game updates and patches can use hundreds of GB per month
📺 4K streamers — streaming in 4K uses around 7GB per hour. Consequently a household watching several hours of 4K content daily can use over 600GB per month
💼 Multiple home workers — video calls, cloud backups and large file transfers add up quickly in households where several people work from home
📱 Households using broadband as mobile backup — if you use home broadband as a hotspot for multiple mobile devices usage can increase significantly
How to check your broadband’s fair usage policy
Finding your fair usage policy requires a bit of digging — providers don’t always make it easy to find. Here’s where to look:
📋 Your contract terms and conditions — search for the words “fair usage”, “acceptable use” or “traffic management” in your contract document
🌐 Provider’s website — look for a traffic management policy or acceptable use policy page — usually in the legal or terms section of the website
📞 Contact your provider — if you cannot find the policy ask your provider directly what fair usage limits apply to your package
📊 Ofcom’s broadband checker — checker.ofcom.org.uk provides standardised information about broadband products including traffic management policies
How to find truly unlimited broadband
If you are a heavy data user and want genuinely unlimited broadband with no fair usage restrictions there are several things to look for when comparing deals:
✓ Look for “no traffic management” in the deal description — this means no throttling regardless of usage
✓ Check the Ofcom broadband checker — it shows standardised traffic management information for all major providers
✓ Read the key facts document — providers are required by Ofcom to provide a standardised key facts document for every broadband deal. Additionally this includes clear information about any traffic management policies
✓ Full fibre packages generally have fewer restrictions — because full fibre networks have greater capacity they are less likely to impose fair usage restrictions than older copper-based networks
✓ Compare deals side by side — use FastSwitch to compare broadband deals and check the small print before signing up
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Compare broadband deals →Written by the FastSwitch team · Last updated June 2026
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