A site loads on your phone’s mobile data and not on home broadband, or the reverse. Before assuming the site is down, check whether you are behind a UK content filter — it is the most common explanation by a wide margin.
Two different filters
1. Home broadband filters
The major UK broadband providers offer network-level content filtering, and on many new lines it is enabled by default. When active it blocks adult categories across every device on the connection — phones, tablets, consoles, everything — regardless of browser or private mode.
How to tell: you get a provider-branded block page rather than a browser error. That page is your answer.
How to change it: only the account holder can, through the provider’s account settings — usually under parental controls or content filtering. It is not a browser setting and no browser change will affect it.
2. Mobile network filters
UK mobile operators filter adult content by default on most consumer plans until the account holder verifies they are over 18. Verification is normally done through the operator’s own account area or app.
How to tell: the site fails on mobile data but works on Wi-Fi.
Other reasons a site fails to load
- DNS filtering you set up yourself. A family-safe DNS resolver on the router blocks adult categories network-wide. Check the router’s DNS settings.
- Device-level content controls. iOS Screen Time and Android Family Link both filter by category and survive changing browser.
- Workplace, school or campus networks. Almost universally filtered, and not something to work around on someone else’s network.
- Antivirus web protection. Some security suites filter categories and show their own block page.
- The site is genuinely unavailable. Possible — but check the block page first.
Diagnosing it in ninety seconds
- Does a branded block page appear, or a browser error? A block page names the filter.
- Try mobile data with Wi-Fi off. Works? Home network filtering.
- Try a different device on the same network. Also fails? Network-level, not device-level.
- Try a different browser. Works? A browser extension or setting, not a network filter.
What to do about it
If it is your own connection and you are the account holder, the filter setting is yours to change through your provider’s account area — that is the clean, correct fix. If you are not the account holder, or it is a network belonging to an employer, a school or someone else, that is not a filter to circumvent; the filter is doing what its owner asked it to do.
A VPN does bypass network-level filtering, and it is worth being clear-eyed about that: it is a legitimate privacy tool on your own connection and a bad idea on someone else’s. Our VPN guide covers what it does and does not do.
A note for parents
If you are on the other side of this — trying to keep adult platforms away from a child’s device — network-level filtering at the router or through your ISP is far more effective than browser settings, because it survives a change of browser, a private window, and a new user account. Device-level controls on top of that are the sensible second layer.
Where to go next
This article is part of our Gamcore Guide — the full reference on how the platform works, whether it is safe, and what the alternatives are. For everything else we publish, start at Gamcore UK.
18+ only. Gamcore UK is an independent publication and is not affiliated with, endorsed by, or operated by any platform we cover. Written and reviewed by the Gamcore UK editorial team.
