For context for "36.15": you would access Minitel services by typing a numeric code followed by a short textual name, the most common code being 3615.

Advertisements for Minitel services would say something like "Dial 3615 HOTSTUFF to meet a passionate lover". A lot of these services were adult chat, games, or extremely low-res porn, and it was easy to rack up a massive phone bill by connecting to them (you'd have to remember to disconnect, too!). Another very common use cases was phone book lookups.

Think of it as a physical terminal for a ncurses-style terminal app using a remote client, with the display updating line by line with a scanning cursor as you received data. There's an example of what that looked like in this short documentary about Minitel: https://www.youtube.com/watch?v=zlUmxUB9RhI&t=500s – every single page loaded line by line that way.