Hello,
I recently moved to a new apartment and the internet connection was already setup by the owner. I noticed there is an Ethernet cable on the wall connected to the wan port of a router-only device. In my previous houses I have used the classic DSL cable and fiber optic cable.
I will try connecting my laptop directly to the Ethernet cable on the wall to find out if it connects to the internet/gets a local ip (probably it won't).
Maybe there is modem device inside the wall that connects to that Ethernet cable.
Any clues?