Privacy risks of eSIM apps when traveling in 2026

1. Alarming findings from an academic study on travel eSIMs

A recent study conducted by researchers at Northeastern University has highlighted particularly concerning privacy risks of travel eSIM apps. This research, presented at the USENIX Security 2025 conference, reveals that the travel eSIM ecosystem has significant vulnerabilities regarding the protection of personal information.

The study notably exposes the opacity of the chain of actors involved in managing eSIM profiles. Contrary to providers’ marketing promises, users struggle to identify who actually processes their sensitive data. This structural complexity creates an environment prone to abuse and considerably complicates the protection of data privacy.

The RSP (Remote SIM Provisioning) protocol assumes that all actors in the chain are trustworthy, which is not always verified in reality.

The researchers also found that travel-related risks increase with the use of eSIMs, as data often passes through jurisdictions with less stringent regulations. This situation exposes travelers to hacking threats and potential surveillance of their digital activities.

2. How your personal data is exposed in the eSIM ecosystem

Data privacy in the eSIM ecosystem relies on a complex architecture involving multiple intermediaries. When you activate an eSIM via a travel app, your personal information passes through various servers before reaching the final operator.

2.1 Unexpected traffic routing

One of the most troubling aspects revealed by the study concerns data routing through undeclared third countries. Your internet traffic may thus transit through servers located in jurisdictions where personal information protection does not offer the same guarantees as in Europe or North America.

2.2 Exposure of critical identifiers

Secure eSIM apps should protect your device’s unique identifiers, notably the IMSI (International Mobile Subscriber Identity) and ICCID (Integrated Circuit Card Identifier). However, the study reveals that many apps expose these sensitive data, potentially allowing tracking of your movements and connection habits.

This exposure facilitates online activity surveillance by malicious actors or authoritarian governments. Consequently, your anonymity while traveling can be compromised even if you believe you are using a secure solution.

3. Security vulnerabilities specific to eSIM applications

Mobile connection security via eSIM presents specific vulnerabilities that travelers should be aware of. These flaws often exploit features inherited from the SIM Application Toolkit, creating entry points for cybercriminals.

3.1 Undocumented proactive behaviors

Some eSIMs adopt undocumented proactive behaviors, establishing automatic connections to remote servers without informing the user. These connections can expose valuable metadata about your browsing habits and geographic location.

The Government of Canada warns against these practices and recommends activating an eSIM only from verified official sources. This precaution becomes crucial in the face of increasing hacking threats in the mobile ecosystem.

3.2 Risks related to malicious QR codes

Activating an eSIM via QR code presents particular risks when traveling. Cybercriminals may display fake QR codes in public places (airports, hotels, cafes) to redirect travelers to malicious apps.

Warning signs to watch for:

• QR codes displayed in unofficial locations
• Apps requesting excessive permissions
• Unusually complex activation processes
• Requests for unnecessary personal information

Always download eSIM apps from official stores (App Store, Google Play) and verify the provider’s authenticity before activation.

4. Strategies to protect your privacy with eSIMs

Protecting data privacy when using eSIMs while traveling requires a methodical approach and specific precautions. Here are the essential strategies to minimize your exposure to risks.

4.1 Optimal configuration of privacy settings

Your smartphone’s privacy settings play a crucial role in protecting your data. Before activating an eSIM, check and adjust these settings:

• 1. Disable automatic data sharing with third-party apps
• 2. Limit location access to strictly necessary apps
• 3. Enable communication encryption in network settings
• 4. Set up a reliable VPN to encrypt all your internet traffic

4.2 Regular audit of your connections

Regularly monitor the connections established by your eSIM. Many smartphones allow you to view apps consuming data and their destinations. This vigilance helps detect any suspicious behavior.

Kaspersky also recommends periodically checking the security certificates used by your eSIM, as their compromise can expose all your communications.

4.3 Proactive management of eSIM profiles

Managing eSIM profiles must follow strict rules to maintain your security:

• Delete eSIM profiles immediately after use
• Never activate multiple profiles simultaneously without necessity
• Use different profiles for distinct purposes (professional/personal)
• Regularly check the list of profiles installed on your device

5. Choosing secure eSIM apps for your travels

Choosing secure eSIM apps is the first line of defense against digital travel risks. Some providers stand out for their enhanced security practices and operational transparency.

5.1 Essential selection criteria

When selecting an eSIM provider, evaluate these fundamental security criteria:

5.2 Recommended providers for security

Among the available options, Saily and Airalo stand out for their transparent security practices and commitment to protecting personal information. These providers regularly publish security reports and maintain infrastructures compliant with international standards.

The advantages of eSIMs when traveling include reducing physical risks (SIM card theft), but security heavily depends on the provider choice and user configuration.

5.3 Best activation practices

Secure activation of an eSIM follows a precise protocol:

• 1. Verify the provider’s authenticity through independent sources
• 2. Use only official channels for downloading
• 3. Carefully read the permissions requested by the app
• 4. Test the connection in a controlled environment before traveling
• 5. Document configuration settings for quick troubleshooting

Avoid activating eSIMs via QR codes found in unofficial public places, as they may redirect to malicious apps.

6. Conclusion

The privacy risks of travel eSIM apps revealed by academic research highlight the importance of a rigorous security approach. Although eSIMs offer undeniable convenience for travelers, their use requires constant vigilance and specific precautions.

Protecting data privacy while traveling involves choosing transparent providers, properly configuring security settings, and continuously monitoring your connections. By applying these best practices, you can enjoy the benefits of eSIMs when traveling while minimizing your exposure to digital threats.

The rapid evolution of the eSIM ecosystem demands regular updates to your security knowledge. Stay informed of the latest findings and adapt your practices accordingly to maintain optimal protection during your international travels.

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