Airport, hotel and cafe networks are different
Airports often have short session timeouts and multiple networks with similar names. Check the network name at the desk or on the official sign, not just the strongest signal. Hotels frequently use captive portals and may block VPN ports; if the app cannot connect, try the provider's alternative protocol or connect after the portal. Cafes are the least controlled: the network may be shared with every customer, and the password may be on a chalkboard. Treat the connection as public even if it has a password. If your trip includes China, our China VPN guide covers the install-before-travel steps.
If you do online banking or access work systems on public Wi-Fi, use the VPN and still prefer the bank's app with biometric login over a browser session. If the VPN disconnects and the kill switch is not enabled, stop the sensitive task until you reconnect.
What a VPN will not fix
A VPN does not stop you from typing a password into a phishing site, and it does not remove malware that is already on your device. It also does not make you anonymous: the VPN provider can see your connection metadata, and websites can still identify your browser. Use it with updates, a password manager, two-factor authentication and a habit of checking the address bar.
Are free VPNs safe on public Wi-Fi?
Some are, most are not a good trade. Free VPNs have to pay for servers somehow, and the site's free VPN risk guide documents the common models: logging, ad injection and data sales. ProtonVPN Free is the exception we recommend because it has a real no-logs policy, open-source apps and no ads, but it limits you to one device and a small server set. For a trip with a phone and laptop, a paid plan is usually the better deal.
Which devices need the VPN most?
Your phone is the device you unlock most often on public Wi-Fi, and it is also the device most likely to hold your email, banking and two-factor codes. Put the VPN there first. A laptop comes second because browser sessions, work tools and cloud drives carry more data. A tablet is usually a streaming and reading device, but it may still have email and shopping apps signed in. If you travel with all three, choose a plan with enough device slots or one that allows unlimited connections.
What to do if the VPN drops
A kill switch is only useful if it is enabled before the drop. Check the setting once at home, not in the airport queue. If the VPN disconnects and the kill switch blocks traffic, reconnect before reopening banking, email or work apps. If the app reconnects automatically, confirm the tunnel is up rather than assuming it is. On a network that repeatedly drops the tunnel, move to mobile data for sensitive tasks.
Public Wi-Fi checklist before you connect
- Confirm the network name with staff or the official sign.
- Complete the captive portal first, then start the VPN.
- Enable auto-connect and the kill switch.
- Run a DNS and WebRTC leak test after connecting.
- Use HTTPS and two-factor authentication for accounts.
- Forget the network when you leave.