Public Wi-Fi away from home: when a VPN matters
The network belongs to someone else. Here is what that actually means for you.
Borrowed Wi-Fi is mostly safe, with two gaps
Most of what you do on a hotel or airport network is already encrypted, because nearly every site and app uses HTTPS. The FTC now calls public Wi-Fi usually safe for that reason. Two things stay open: the owner of the network can see which services your devices talk to, and you cannot always tell whether the network you joined is the one the hotel runs.
A VPN key closes both gaps. It does not make a phishing site safe and it does not hide you from accounts you sign in to.
The key behaves the same on any Wi-Fi that lets you reach the web. Ask in the bot if one refuses to connect.
Ask in the botWhat is different on a network you do not own
- Everyone in the building shares it, and so does whoever set it up.
- The login page in the middle, the captive portal, can see your device name and hardware address.
- Network names are easy to copy, so a stranger can broadcast one that looks right.
- Some apps still send small bits of data without encryption, usually for analytics or updates.
Habits that help on any borrowed network
- Ask staff for the exact network name before joining.
- Turn off automatic joining of open networks on your phone and laptop.
- Finish the login page first, then switch the key on.
- Keep two-factor sign-in turned on for email and banking.
Where a key fits
With the key on, the hotel or café sees one encrypted connection to a single server and nothing about the apps inside it. That also takes the sting out of a look-alike network: whoever runs it gets the same unreadable stream.
The guides below go place by place, because an airport is not a hotel and a library is not a coffee shop.
When you can skip it
If you only open a banking app that pins its own encryption and you trust the network, a VPN adds little. The same goes for a quick weather check or a map lookup on a network you joined by name with staff.
At home the question changes. The network is yours, so the party that sees your traffic is your internet provider, and that has its own section on this site.
Sources
Questions
Is public Wi-Fi safe for online banking?
For a bank's own app or website over HTTPS, the content is encrypted. The bigger risk is typing your password into a fake page, which no VPN prevents.
Can the hotel see my passwords?
Not on HTTPS sites. It can see which services you connect to unless a VPN is on.
Do I need the key on my laptop and my phone?
Ideally on both. Up to five devices can share one key at the same time.
Why does the key break the hotel login page?
Login pages need a direct connection. Switch the key off, sign in to the page, then switch it back on.
Is a personal hotspot safer than hotel Wi-Fi?
Usually, because only your devices are on it. It uses your mobile data, so watch your plan's limits.
Your key is at the desk
Five free days, five devices, no card. Pick it up in Telegram.