Telephone connection / LAN wiring

Well, with the DSL plan you automatically get a (unlimited) flat rate, at least to the German landline network. My wife and I therefore have no or limited free minutes on our mobile phones, because 1.5-hour calls over the landline do make a difference. Apart from that, all our friends have a landline connection and the prices for calls abroad are also cheaper than from the mobile phone...

77.willo telephone cable? What do you want to do with it? I would lay the Fritz over the patch panel into the office as suggested here. Please remember that there are also enough sockets from the patch panel in the office.

And an access point for 30€ is absolutely sufficient in a normal household. Why would you spend 150€ on that?

So, there is a help video from Telekom that explains it in a way understandable for laypeople. The fiber optic cable comes into the utility room. There is a termination box and a fiber optic modem. From there, in our case, a cable goes from the modem into the office, which is for the router. I plug the phones and the fax into it. I plug the router into the wall socket. Internet works via WLAN, the office is centrally located in the bungalow, all rooms plus the terrace should have a signal, especially since there are no reinforced concrete walls. Done. We leave the TV out, it goes via SAT. So you don’t need network sockets in every room either. That’s how I’ll have it done.

We leave the TV out of consideration, it goes via SAT. Therefore, network sockets in all rooms are not needed.

I see this differently from many here. If you are building new anyway, a proper LAN cabling should be planned. Of course, in the end it is a matter of taste and need, but without fixed cabling you limit yourself some possibilities for the future, e.g. fast streaming from the NAS drive. Also, television will not run (only) via SAT anymore in the foreseeable future...

I add: My TV is already connected via LAN today, because 4k streaming over WLAN is reaching its limits.

The future will not bring us smaller amounts of data, quite the opposite. It is enough to simply look at the standard built-in hard drives in PCs for average users, how the capacity has continuously increased over the past years.

In order to handle these amounts of data at all, we need bandwidth. Therefore, I can only recommend to everyone: lay LAN to all the places where you plan to have consumers.

At our place, the house connection is also in the dark room in the corner and the office is in a completely different corner.

Besides the LAN cabling, we are currently leaning towards also laying a telephone cable in two places in the house (kitchen + office).
If I were to place the router, for example, in the office and connect it via the telephone cable, I could connect the LAN cable at the LAN port, which runs back to the house connection room, and supply the main house there via LAN through the patch panel.
Basically exactly what 11ant has already explained.

But that doesn't sound really optimal yet.

Another option would be to leave the router in the house connection room, supply all rooms via LAN, and set up a WLAN access point where desired.
Are there now phones that can be connected via WLAN or do I still need a telephone cable from the router to the phone's location?