eSIM with DNS Encryption: Prevent DNS Leaks on Mobile

The DNS Leak Problem

Even with an anonymous eSIM and VPN, DNS leaks can expose which websites you visit. DNS queries are traditionally sent in plaintext. If they leak outside your VPN tunnel, your carrier can see every website you visit. PrivateSims recommends encrypting DNS as a fundamental privacy measure.

DNS Encryption Options

• DNS over HTTPS (DoH): Sends DNS queries over encrypted HTTPS connections
• DNS over TLS (DoT): Wraps DNS queries in TLS encryption on port 853
• DNSCrypt: Alternative protocol that authenticates and encrypts DNS traffic

Configuration Guide

Android 9+: Settings, Network, Private DNS. Enter your chosen provider hostname.

iPhone: Install a DNS profile from providers like NextDNS or Cloudflare for system-wide encryption.

With VPN: Most VPN apps handle DNS within the tunnel. Verify by running a DNS leak test.

For more on DNS protection, see our DNS over HTTPS guide.

FAQ

How do I test for DNS leaks?

Visit dnsleaktest.com from your device and run the extended test. If you see your carrier DNS servers, you have a DNS leak.

Which DNS encryption method is best?

DoH is generally recommended for mobile users because it is harder to block and natively supported by most modern devices.