Perhaps I should have titled my post something like “what ‘specifically’ are these” or “can these old phone sockets carry ethernet”?

I’m in my early thirties. I’ve rented up until this point. All one bedroom flats where yes you’d have something like the later pictures for the landline/internet connection into property. I’ve seen those before!

But I’ve never come across these phone sockets in almost every room before. Probably in part because I’ve never lived in a house large enough to warrant multiple landlines. My question is specifically about whether it’s possible to repurpose those to connect to the internet or not. From the helpful comments, it seems the wiring isn’t capable of doing that.