Roaming Guard

Markus Petermann | System

6 Downloads 14 Views v1.0 2.85 MB 4.1+

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(2.85 MB)

Editor's Overview

Roaming Guard is a system application developed by Markus Petermann, packaged as a single Android APK of version 1.0 weighing in at 2.85 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

Install Checklist

Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
File size is a light 2.85 MB, so it installs quickly even on modest connections.
This build is signed by "Markus Petermann" — always verify the developer name matches what's listed on the app's official store page before installing an update.
After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

About this app

Roaming Guard protects you from accidental roaming connections by monitoring your mobile network operator. The app compares your current operator against a customizable MCC/MNC allowlist or denylist. When your phone connects to an unwanted operator, you can choose to either receive a warning notification or — with some limitations — automatically block data traffic. Roaming Guard includes a predefined EU/EEA allowlist, and you can easily create your own custom list that perfectly matches your mobile plan.

Regular Android apps cannot completely block data traffic or even disable data roaming. Therefore, this app implements a local, on-device VPN service that drops all traffic routed through the VPN when enabled. However, this approach has the following technical limitations:
- Android only supports one active VPN at a time, meaning conflicts may arise if you use another VPN app.
- Tethering and mobile hotspot traffic is not routed through the VPN by Android and therefore cannot be blocked.
- System apps that can explicitly select their network connection may bypass the VPN.
- DNS and NTP traffic have been reported to leak outside the VPN.
- There might be short time windows after boot, or when enabling the VPN, where traffic might not be filtered.

Details

Version	v1.0
Size	2.85 MB
Developer	Markus Petermann
Category	System
Package	net.markuspetermann.roamingguard
Android	4.1+
Last Updated	Oct 29, 2026
Downloads	6

Frequently Asked Questions

Is Roaming Guard free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does Roaming Guard require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is Roaming Guard safe to install?
We link to the exact APK published by Markus Petermann. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update Roaming Guard?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

How to Download & Install Roaming Guard

Tap the Download APK button above and save the file to your device.
Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
Open the downloaded net.markuspetermann.roamingguard.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «Roaming Guard» by Markus Petermann and grant only the permissions it actually needs.
Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.