Okay, so not a unicorn, but definitely a relic from the telecom dark ages:
I spotted it in Chinatown (Dundas and Spadina, north east side) a couple days ago. I didn’t know there were any public phones left in the city. Not sure if it works, it looked kind of disgusting up close so I took a pass on testing it. Which, reminded me why I eagerly embraced mobile phone technology.