Why Cyber Agencies Now Say Turn Off Wi-Fi on Your Phone

Government cyber agencies in France and the United Kingdom are escalating their warnings for smartphone users. The latest advice is unusually direct: completely turn off Wi-Fi whenever you’re not actively using it.

The recommendation applies to both iPhone and Android devices and reflects growing concern over how wireless connections are being exploited.

Phones have become central to daily life, storing messages, photos, passwords, banking details, and location data. That makes them attractive targets.

Cyber agencies say the modern mobile threat environment has shifted, with attackers increasingly focusing on wireless connections that are always on, often without users realizing it.

Why Wi-Fi Has Become a Bigger Risk

Wi-Fi, especially public or poorly secured networks, is now seen as one of the easiest ways for attackers to access personal data. Hackers can set up fake Wi-Fi hotspots that look legitimate, such as “Free Airport Wi-Fi” or “Hotel Guest Network.”

When a phone connects, attackers can intercept traffic or redirect users to malicious websites.

Even trusted or previously used networks can be abused. Attackers can impersonate known Wi-Fi names, tricking phones into reconnecting automatically.

This allows criminals to sit quietly between the user and the internet, capturing logins, messages, or other sensitive information without obvious signs of compromise.

Cyber agencies warn that simply disconnecting from Wi-Fi is not enough. On many phones, Wi-Fi remains active in the background and continues scanning for networks. This is why experts now recommend fully disabling the Wi-Fi interface when it’s not needed.

Fig 1. How hackers intercept and modify different signals. (Source: CERT-FR)

Smartphones Are High-Value Targets

Smartphones handle more data than ever and rely on multiple wireless technologies, including Wi-Fi, Bluetooth, and cellular networks. Each connection point increases the “attack surface,” meaning more ways for attackers to get in.

Some attacks don’t even require user interaction, allowing devices to be compromised silently.

Government agencies say these weaknesses are not limited to apps. Vulnerabilities can exist in operating systems, wireless chips, or network protocols themselves.

This makes attacks harder to detect and harder to prevent, even for cautious users who avoid suspicious links and downloads.

Because phones are always nearby and constantly connected, attackers see them as powerful tools for surveillance, data theft, and long-term monitoring. This has pushed agencies to recommend stronger everyday precautions, even if they feel inconvenient.

Practical Steps to Reduce Your Exposure

Turning off Wi-Fi when it’s not needed is now a top recommendation. Users should disable Wi-Fi through their phone’s settings, not just quick-access menus, to ensure it’s fully off. Automatic connection to known or open networks should also be disabled.

Public Wi-Fi should be avoided whenever possible. If it can’t be avoided, using a reputable VPN like Certo Secure VPN can help encrypt data.

Other key steps include keeping phones updated, restarting them regularly, installing apps only from official stores, and reviewing app permissions.

While these steps won’t eliminate all risk, agencies say they significantly reduce exposure. The message is clear: the mobile threat landscape has changed, and everyday habits may need to change with it.