I am trying to connect the router to the mobile network. It shows good signal strength, the SIM card is activated and the update is up to date (done via cable). Nevertheless, it does not connect to the Internet as soon as I unplug the Lan cable. Roaming cannot be activated, the region is set to Germany and cannot be changed (display: "set during router configuration"). However, there is nowhere to select Switzerland. After resetting several times, the result is always the same. What do I need to do differently?