Why Do Websites Work on Wi-Fi but Not on Mobile Data?

Your phone works perfectly on Wi-Fi. You leave the house, the 4G or 5G symbol appears, you open a website and… nothing. 

Meanwhile, WhatsApp might still work. Or perhaps every app has decided to join the protest. 

When websites work on Wi-Fi but not mobile data, the problem is usually somewhere between the phone and the mobile network. It could be a dodgy mobile-data session, incorrect APN settings, Private DNS, a VPN, browser restrictions or simply poor coverage. 

The useful clue is that Wi-Fi works. 

That tells you the phone and website are probably fine. Now you can stop blaming the router and look at the mobile side of things. 

Full 5G, Absolutely No Internet 

Sana noticed the problem on her way to work. 

Spotify kept playing, but Chrome refused to open a couple of websites. Her phone showed 5G, so naturally she refreshed the page about 17 times. 

Still nothing. 

She switched Wi-Fi off completely, toggled Airplane Mode for a few seconds and let the phone reconnect. 

Everything started loading again. 

The signal bars had never disappeared. The mobile connection had simply got itself into a muddle. 

Google’s Android troubleshooting guidance recommends testing Wi-Fi and mobile data separately, restarting the device and switching Airplane Mode on for around 10 seconds when mobile connectivity is playing up. 

Sometimes, that really is all it takes. 

First, Find Out How Broken It Actually Is 

Don’t start resetting network settings just yet. 

Try a few different things. 

On iPhone, you can also check whether mobile data has been disabled for a particular app under Settings > Mobile Service/Cellular. Apple lets users decide which individual apps can use cellular data. 

So if Safari works on Wi-Fi but seems dead outside, make sure somebody hasn’t accidentally told it to stay off mobile data. 

Give the Mobile Connection a Fresh Start 

Airplane Mode is the quickest fix worth trying. 

Switch it on, wait a few seconds, then turn it off. 

On current iPhone troubleshooting guidance, Apple recommends leaving Airplane Mode on for at least 15 seconds when dealing with cellular connection problems. 

Android’s guidance suggests around 10 seconds. 

Then try the website again. 

If that fails, restart the phone. 

Yes, it is basic. No, you do not lose technical credibility for trying it. 

There is no bonus prize for spending half an hour changing DNS settings when a reboot would have sorted it before breakfast. 

Check Private DNS and VPN Settings 

This is particularly worth doing if websites stopped loading after you installed a VPN, ad blocker or changed DNS settings. 

Android uses Private DNS on networks that support it and recommends leaving the feature enabled. A manually entered Private DNS hostname, however, can cause trouble if that particular provider cannot be reached properly. 

Try changing Private DNS back to Automatic. 

If you use a VPN, disconnect it completely and test the website again. 

A stuck VPN route can make the mobile network look broken even though the SIM is connected perfectly well. 

On iPhone, Apple specifically recommends checking VPN and third-party security software when internet connectivity suddenly stops behaving normally. 

The APN Is Worth Checking, but Don’t Fiddle With It for Fun 

Your APN tells the phone how to connect to the mobile provider’s data service. 

Normally it configures itself. 

If the APN is wrong, though, you can have perfectly respectable signal bars with very little happening behind them. 

This sometimes crops up after changing SIMs, manually editing settings or moving between providers. 

Use only the APN details supplied by your network. 

Do not paste settings from a five-year-old forum because somebody claimed they unlocked “maximum 5G speed”. 

There are enough genuine phone settings without inventing secret ones. 

Could It Simply Be Coverage? 

Absolutely. 

A phone displaying 4G or 5G does not guarantee a brilliant internet connection. 

Ofcom says mobile performance depends on more than whether coverage technically exists. Its Map Your Mobile service separates coverage from performance, including whether users in an area are likely to stream video successfully. 

Network congestion matters too. 

UK customers used more than 1.2 billion GB of mobile data per month in 2025, an increase of 18% in a single year. 

If websites become sluggish every evening at the same station or high street, the phone might be fine. 

You’re simply sharing the network with half the postcode. 

Leave Network Reset Until Later 

Resetting network settings can fix stubborn problems, but it should not be your opening move. 

On iPhone, resetting network settings removes existing network configurations, including saved Wi-Fi information and manually configured network settings. 

Try Airplane Mode, restarting, DNS checks and VPN checks first. 

If you’ve changed six settings at once, you’ll have no idea which one caused the problem or which one fixed it. 

Troubleshooting works much better when it isn’t performed like a raffle. 

Where Talk Home Mobile Fits 

Talk Home Mobile currently includes 5G across its SIM-only plans, with VoLTE and Wi-Fi Calling available on compatible devices at no extra charge. 

If websites load on Wi-Fi but not through a Talk Home Mobile connection, test ordinary mobile data before changing anything drastic. 

Toggle Airplane Mode, check whether other apps work and undo any recent VPN or Private DNS changes. 

If the problem happens only in one location, check coverage too. 

A browser problem that follows you everywhere is one thing. 

A browser that gives up every time you stand on the same railway platform is dropping a fairly large hint. 

Final Thoughts 

When websites work on Wi-Fi but not mobile data, start with the obvious stuff. 

Check that mobile data is actually enabled. 

Try another app. 

Toggle Airplane Mode. 

Restart the phone. 

Then move on to VPNs, Private DNS and APN settings. 

Save the full network reset for when the sensible fixes have failed. 

Most importantly, notice the pattern. 

If everything broke immediately after you changed a setting, start there. 

Your phone is usually not trying to ruin your day. 

It has simply been given an instruction it took far more seriously than you expected.