How do I get WiFi and phone service, technology in the basement

I don't quite understand why it is better to turn off the WLAN of the fritz.box?

You will notice that immediately within three days.

But that has nothing to do with mesh WLAN.

I have been doing it this way for years, and it works perfectly.

Do you have a suggestion?

Just read that. That's obviously nonsense. A client will normally prefer the stronger access point with one and the same SSID. It's important that both/all APs or SSIDs use the same security settings.

To avoid hopping between networks. If that's not the case for you, for example because your basement ceiling attenuates the basement Wi-Fi strongly enough, then it's not better to turn off the Wi-Fi of the box but it doesn't matter.

So. Now let's get down to business. Maybe I'm just too stupid. Nope... I can say that from my own experience with both good notebooks and good smartphones. The devices are dumb. As long as the old access point still sends some kind of halfway decent signal, it won't switch to the better one. (Access point and router have the same SSID) That's exactly what Mesh is supposed to improve. And I can confirm that in my current apartment. Mesh works 95% of the time. Ben-man's opinion goes in that direction too. So once again my question: can APs connected to the router via CAT7 cable have intelligent control like Mesh WiFi networks? If not, I would be pretty disappointed. That annoyed me back then, having to manually intervene all the time.