The idea is, much like phones in real life Progia's gain the ability to have a speaker mode. Kind of like how a radio is treated in a room, or treated like a person speaking softly.
Could be turned into an app.
That's my thought.
Imagine you go to meet up with some chum and they're holding their Progia but you think nothing of it. Unbeknownst to you they're in a speaker call with someone else and it's all being heard.
Could definitely make some cool RP scenarios I think, but I think if someone takes the time to look at the Progia that a person is holding, it should be incredibly clear whether they're on speaker or not.