eSIM Privacy and Security — Is Your Travel Data Safe?

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When you use a travel eSIM, you’re routing your mobile data through a provider and their roaming partners. What data do they collect? Who can see your activity? Here’s an honest privacy assessment of travel eSIM services.

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What eSIM Providers Can See

Your eSIM provider operates at the network layer — they provide your internet connection, not your content:

They CAN see:

Data volume used
Your device IMEI
Time stamps of data sessions
Which countries/networks you roamed on
IP address assigned to your session

They typically CANNOT see:

Your browsing history (with HTTPS)
App content
Messages (encrypted)
Financial transactions (HTTPS)

Is eSIM More or Less Private Than Physical SIM?

From a privacy perspective: essentially the same. Both a physical SIM and eSIM route your traffic through a carrier. The technical difference (chip vs software) doesn’t change what data the carrier has access to.

The difference is who operates the carrier:

Physical local SIM: local carrier (e.g., AIS Thailand)
eSIM: eSIM provider + underlying roaming partner carrier

With eSIM, there’s one additional party (the eSIM provider) in the chain.

Privacy Policies — What Major Providers Commit To

Provider	Privacy Policy Key Points
Airalo	Collects account info, usage data; standard commercial policy
Saily (Nord Security)	Privacy-first; no browsing data logging; backed by NordVPN
Holafly	Standard commercial data collection
GigSky	Enterprise-focused; standard commercial policy

For most travellers, Airalo’s privacy policy is adequate — it’s a standard commercial SaaS company without any notable privacy red flags.

How to Protect Yourself on Travel eSIM

1. Use a VPN
Running NordVPN, ExpressVPN, or Mullvad over your eSIM encrypts your traffic. The eSIM provider sees encrypted data going to a VPN server — not your actual browsing.

2. Use HTTPS websites
All modern websites use HTTPS. Your eSIM provider cannot read your banking, emails, or social media content — only that you connected to those servers.

3. Enable two-factor authentication on important accounts
If you’re accessing sensitive accounts abroad, 2FA prevents unauthorised access even if credentials are compromised on public WiFi.

4. Separate sensitive work from travel connectivity
For journalists, activists, or those in high-risk environments: use a separate dedicated device for sensitive work with a privacy-first connection (Mullvad VPN + Saily or similar).

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Government Access and Legal Jurisdiction

In some countries, governments can legally compel carriers to provide subscriber data. With a foreign eSIM:

Your data routes through local roaming partners
Those roaming partners are subject to local law
A government with authority over the local carrier could request network-level data

For most travellers, this is theoretical. For journalists or activists in countries with surveillance concerns, VPN + privacy-focused eSIM provider is recommended.

The Most Privacy-Conscious eSIM Option

Saily (Nord Security): Explicit no-logging policy backed by privacy-first company culture. Run with Mullvad VPN for maximum privacy.

Airalo: Standard commercial privacy — fine for 99% of travellers, not specifically optimised for high-risk scenarios.

My Actual Setup

Airalo eSIM (data connection)
ExpressVPN enabled on public WiFi
HTTPS everywhere (default on modern devices)
1Password for all accounts

This protects against the practical threats (public WiFi sniffing, credential theft) without the overhead of a full privacy stack needed only for high-risk environments.

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eSIM Privacy and Security — Is Your Travel Data Safe?