Tunnelfunk – Netz im Zug

Systemhaus Wandlitz

About this app

The network keeps dropping out on the train. Not because it's too slow, but because it disappears completely for seconds at a time—at higher speeds, your phone switches cell towers every few minutes.

Tunnel Radio uses Wi-Fi and mobile data SIMULTANEOUSLY instead of switching between them. If one network fails, the other takes over—no waiting, no interruption.

Three classes, just like on a train:

• STANDING (free): Every data packet travels on whichever network has the best signal. Chatting always works, although a page might freeze briefly when switching networks.

• 2ND CLASS: Speed. Data packets are distributed across both networks—streams and pages load at the speed of both networks, and important data is routed through both.

• 1ST CLASS: Reliability. Every data packet travels on both networks simultaneously—video calls stay connected even if one network drops out.

The track diagram shows you live what each network is currently capable of: ping, speed, dropouts, packet loss—represented by a miniature railway line with a locomotive and carriages.


• STANDING CLASS: Speed. Every data packet travels on both networks simultaneously—the video call remains stable even if one network fails. What you should know: Tunnelfunk establishes a VPN connection so that traffic can route through both networks. In 2nd and 1st class, it runs through our server in Germany; in standing room, it remains on your device. 1st class uses twice the data volume – that's the price for stability.

Introductory phase: All three classes are free at launch, without an account or registration. A subscription for 1st and 2nd class will follow in a later version; the app will notify you in good time.

New in version 1.1: Connect your laptop via cable – connect your Mac via USB, and the Tunnelfunk train companion app (download at tunnelfunk.de) will travel with you. A counter displays "Dead zones overcome · Connections saved." Messages from the operator are displayed directly in the app.

Operator: Renneberg Media UG (limited liability), Wandlitz.

What’s new

Neu: Streckenkarte – ganz Deutschland mit Gleisen nach Netzqualität, zoombar, mit grauer Hintergrundkarte (basemap.de, abschaltbar). Optional mit Netzprognose: bis zu welchem Bahnhof ein Videocall noch geht, Dein Standort und Funkmast auf der Karte. Im Zug-WLAN liest Tunnelfunk das Bordportal. Reisebilanz am Fahrtende. Behoben: Stehplatz startet jetzt auch direkt nach der Installation; ab Android 15 liegt nichts mehr unter der Statusleiste.