Why your VPN works on Wi-Fi but not on mobile data (and vice versa)

“It works at home but not on my phone’s internet.” We hear this every day, and the reverse just as often. Nothing is wrong with your phone. Wi-Fi and mobile data are two different networks, run by different companies, with different rules about what they let through.

Two networks, two sets of rules

When you’re on Wi-Fi, your traffic goes through whoever provides that internet connection: your home internet provider, your office, a café or a hotel. When you’re on mobile data, it goes through your mobile operator.

Each of them can decide, on its own, to:

• block some kinds of connections completely,
• slow down traffic it doesn’t recognise,
• allow only a short list of approved websites and services, which some countries now do on mobile networks during restrictions.

So a VPN server that’s easy to reach from your home Wi-Fi can be invisible from your mobile operator’s network, and the other way round.

Why mobile data is often stricter

In several countries, mobile networks are where restrictions arrive first, and where they are tightest:

• Mobile operators are fewer and easier to regulate than thousands of small Wi-Fi providers.
• Restrictions are sometimes switched on by region or for a few hours, so a VPN can work in the morning and stop in the afternoon.
• Some operators send all traffic through a single filtering point, so a block applies to every customer at once.

Home and office internet is often more relaxed, but not always. Public Wi-Fi in hotels, universities and offices can block VPNs on purpose too.

What to do when one network fails

1. Switch to the other network. If mobile data fails, try Wi-Fi, and vice versa. It’s the quickest test there is.
2. Let the app search. On a strict network, finding a server takes longer. Berry tests servers from the network you’re on right now and joins the fastest that answers, so give it a little time.
3. Use Auto location. The more countries the app can choose from, the better its chances.
4. Reconnect after switching. If you move from Wi-Fi to mobile data while connected, the old connection may stall. Disconnect and connect again so the app searches from the new network.
5. Update the app. New versions learn new ways to get through. Since version 1.2, Berry looks for servers that work from your own network instead of trying a fixed list, so it connects on many networks where it used to fail.

Is one safer than the other?

Not in the way people expect. With a VPN on, both your Wi-Fi provider and your mobile operator see encrypted traffic going to a VPN server instead of the sites you visit. Without a VPN, public Wi-Fi is the bigger risk, because you don’t know who runs it. We cover that in our public Wi-Fi safety guide.

The short version

If your VPN fails on one network, it doesn’t mean the VPN is broken. Switch networks, give the app time to search, and keep it updated. If nothing connects on either network, start with our checklist for when a VPN won’t connect.