This is a fun idea. It makes me think of Dispatch and how you could, just by being the operator, weave stories between the callers and receivers. You wouldn't want to eavesdrop too much, but just enough to help the next caller or repeat callers.
Then there could be a timer involved. For example, if a person really wants to talk to someone who is already on the phone, how do you interrupt them? I can see the game getting pretty deep. That's awesome! One thing to note is that the placement of the binder was a little bit hard. It's hard for me to tell or just read the text from that distance.
As well as the symbols in general: they're distinct from each other, but maybe it's how they're being displayed in the world or something, but they're not super legible.
Keep up the work. I look forward to seeing if we go further with it.