A VPN creates an encrypted tunnel between your device and a VPN server, but it is not a shield against every risk on the Internet. It does not stop you from entering a password on a fake website, guarantee that every app is safe, or make illegal activity legal.
This article provides technical information and connection-preparation experience, not legal advice. Rules and enforcement may change; you are responsible for checking current information and complying with local law.
How does the Great Firewall affect connections?
China controls access to many international websites and services. Techniques may include DNS filtering, IP address blocking, and deep packet inspection. Because filtering mechanisms change, a configuration that works today may be less stable at another time.
Proton VPN describes these techniques and clearly says that no VPN can guarantee 100% reliability in China. This is the cautious wording that both providers and users should keep: describe the real situation rather than promising that something will “never be blocked”.
What can a VPN protect?
When configured correctly, a VPN encrypts traffic between your device and the VPN server. This is especially useful on Wi‑Fi networks you do not control. The destination website will usually see the VPN server’s IP address instead of your original public IP address.
However, a service you log into still knows your account. Cookies, browser information, location permissions, and data you provide yourself do not disappear just because you turn on a VPN.
What a VPN does not do for you
- It does not detect every scam website.
- It does not replace security updates and anti-malware software.
- It does not protect data after you send it to a service.
- It does not guarantee that banking apps or region-specific content will work.
- It does not erase history in your Google, Facebook, or other service accounts.
- It does not guarantee a continuous connection on every carrier.
If an advertisement uses phrases such as “complete anonymity”, “impossible to detect”, or “works 100%”, treat that as a sign to investigate more carefully.
Device security checklist
Update before your trip
Update your operating system and apps while you are still using a familiar network. Updates do more than add features: they also patch security flaws that could be exploited through downloaded files or malicious websites.
Download only from trusted sources
Open the compatible apps directory to see options by platform and visit the publisher’s public page. On Android in particular, do not turn off protections just to install an unknown APK. Google explains the risks of unverified apps in Android Help.
Protect your accounts
Use a unique password for your VPN and email accounts. Turn on two-factor authentication for email because it is often where password-reset links arrive. Do not share a QR code or subscription link; anyone with the link may be able to use your access.
Be careful with certificate warnings
If your browser reports an invalid certificate, do not habitually click through it. Check your device’s date and time, the domain name, and the network you are using. A legitimate website will not ask you to install an unfamiliar certificate through a private message to “speed up your VPN”.
Notes on regulations in China
The official GOV.UK travel information states that the Chinese authorities control the Internet and that products and online services such as VPNs require licensing. It advises travellers to follow updates and comply with Chinese law.
Do not infer from one person’s experience that a particular use is certainly legal or certainly free from enforcement. If your use involves work, business data, or a regulated industry, ask your organisation’s legal team or a suitably qualified adviser.
When should you turn off a VPN?
Some domestic apps, banks, or business systems may require an IP address that matches their region. If a trusted service does not work while the VPN is on, you can turn it off temporarily to test. Remember that traffic generated while it is off will not pass through the VPN tunnel.
If you are not sure which app is controlling the network, on iPhone/iPad and Mac look for VPN, profile, firewall, or filter in Settings/System Settings. Apple Support also recommends checking VPNs and third-party security software when a device has network problems.
Conclusion
Safe VPN use starts with the right expectations: it is a connection-protection tool, not an exemption permit, and it does not replace good security habits. Prepare the app before your trip, keep the device updated, download from a clear source, and follow the rules where you are.
For more practical preparation, read the checklist before travelling to China or the device-by-device installation guide.