From coffee shops in Soho to tube stations on the Elizabeth line, public WiFi is everywhere in London, and it’s tempting to connect without a second thought. But should you? The short answer is: it depends on what you’re doing and whether you’re taking the right precautions. Here’s what you need to know.
What Makes Public WiFi Risky?
Public WiFi networks are, by design, open and shared. Unlike the private network in your home or office, you have no idea who else is connected, or what they’re up to. This creates a few genuine security risks.
Man-in-the-middle attacks are one of the most common threats. A cybercriminal positions themselves between you and the WiFi router, intercepting the data passing between your device and the internet. If you’re logging into a website or sending information without a secure (HTTPS) connection, that data can be read in plain text.
Evil twin hotspots are another sneaky trick. A hacker sets up a rogue WiFi network with a convincing name, such as “Starbucks WiFi” or “Virgin Trains Free WiFi”, and waits for unsuspecting people to connect. Once you’re on their network, they can monitor everything you do.
Packet sniffing involves using freely available software to capture and analyse data travelling over a WiFi network. On poorly secured public networks, this can expose unencrypted traffic from multiple connected users at once.
So Is Public WiFi Ever Safe?
Yes, but with caveats. Public WiFi is generally fine for low-risk activities like:
- Reading the news or browsing general websites
- Streaming music or podcasts
- Checking non-sensitive emails (with HTTPS)
- Getting directions or using maps
Where it gets risky is when you move into more sensitive territory: online banking, logging into accounts with sensitive information, entering payment card details, or accessing work systems and confidential files.
How to Protect Yourself on Public WiFi
The good news is that staying safe on public WiFi doesn’t require a degree in cybersecurity. A few simple habits go a long way.
Use a VPN
A Virtual Private Network encrypts all the data leaving your device, making it unreadable to anyone who might be snooping on the network. This is the single most effective thing you can do. Many reputable VPN apps are available for smartphones and laptops, and some businesses provide them as standard for remote workers.
Stick to HTTPS websites
Look for the padlock icon in your browser’s address bar. This means the connection between your browser and the website is encrypted, even on public WiFi. Modern browsers will warn you if you’re about to visit an insecure (HTTP) site.
Turn off automatic WiFi connection
Many phones and laptops are set to automatically connect to known or open networks. This can land you on a rogue hotspot without you realising it. Switch this off in your device settings.
Avoid sensitive transactions
If you need to check your bank balance or make a payment, it’s worth waiting until you’re on a trusted network, or simply using your mobile data instead.
Enable your firewall.
Windows and macOS both have built-in firewalls. Make sure yours is turned on, particularly when using public networks.
Log out when you’re done.
Don’t leave accounts open when you step away or disconnect. Proper log-out (not just closing the tab) ends your session on the server side.
What About Business Users?
For anyone working remotely, whether from a café in Fitzrovia or a hotel lobby in Canary Wharf, public WiFi poses more serious risks. Company data, client files, and internal systems are all potentially exposed.
Businesses should ensure that remote workers are equipped with a company-approved VPN and that employees understand the risks of working on unsecured networks. A clear remote working policy is essential and worth reviewing regularly as threats evolve.
If your business relies on WiFi for day-to-day operations and you’re concerned about network security, it’s worth speaking to a professional who can assess your setup and recommend the right solutions.
The Bottom Line
Public WiFi is a convenient tool, but it’s not a private one. The risks are real, though they’re also manageable with the right habits. Use a VPN, stay on HTTPS sites, avoid sensitive transactions, and stay sceptical of networks you don’t recognise.
And if you’re thinking about the security of your home or business WiFi network, not just public hotspots, we’re here to help. At WiFi Man, we design and install secure, high-speed wireless networks for homes and businesses across London. Get in touch to find out how we can give you a network you can trust.
Need a secure, reliable WiFi network at home or in your business? Contact WiFi Man or call us on 020 3369 0669.
Photo by Paul Hanaoka on Unsplash
