Hey Inderdeep, Thanks for your quick response. I already followed that installation guide. The cellular connection shows "Ready": However, once I disconnect the WAN connection, the router goes offline. I suspect that I need to specify an APN. The SIM card I use is from Deutsche Telekom (congstar). Their support send me a link to their APNs: https://forum.congstar.de/Tarife/Tarif-Produktberatung/46325-Mobil-surfen-mit-congstar-manuelle-Einstellungen-zum-mobilen-Internet-APN All of them require a username and password, which I cannot specify:
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