Mobile Firewall for eSIM: Control Your Network Traffic

Why You Need a Mobile Firewall

Most smartphone apps connect to the internet without your knowledge, sending data to analytics services and trackers. A mobile firewall gives you control over which apps can use your PrivateSims eSIM data connection.

How Mobile Firewalls Work

Mobile firewalls intercept network requests from apps and either allow or block them based on your rules.

• NetGuard (Android): Open-source, no root required, blocks internet per app
• AFWall+ (Android, root): iptables-based firewall for rooted devices
• Lockdown Privacy (iPhone): Blocks trackers and custom domains
• DNS-based blocking: Use Pi-hole or NextDNS to block tracking domains

Firewall Configuration

Start by blocking all apps from network access, then selectively allow only apps you actively use. This default-deny approach ensures no app communicates without your knowledge.

Combine your firewall with our privacy checklist for comprehensive protection.

FAQ

Will a firewall slow down my connection?

Modern mobile firewalls add negligible overhead. Filtering happens locally and does not measurably impact speed.

Can I use a firewall and VPN simultaneously?

On Android, both may use the VPN interface. Solutions like NetGuard with DNS blocking or a DNS-based blocker alongside your VPN work well.