Interesting coincidence, someone made a teletext + fax joke about digitization in Germany yesterday (I mean, someone probably makes one every hour, it's fair) and I jokingly asked if you could access German teletext via telnet.

Then just one google query later I stumbled upon https://www.ard-text.de - which is teletext via HTTP in a funny anachronistic way.

But they also have a mobile version ( https://www.ard-text.de/mobil/101 ) which is actually awesome. Minimal layout, 34kb unzipped.