I literally JUST went through that subway station 20 minutes ago. West 4th Street, right?
The OP said she was not *on* the train, and that station is pretty big. If she was waiting for the elevator, by the time a train came, they got to the conductors car through the throngs, asked him to alert someone, (probably got him to stop laughing and convinced him they were serious; bc it was Halloween, in the Village, with literally 100 times the usual crowd volume on the trains coming to the parade), and someone arrived, the OP would have been long gone, blissfully unaware, and at the meeting already.
And again, no matter what you set your cell phone on, you have no signal there, if it's the lower platform, which I presume by the "waiting for the elevator" part. There is no service from any carrier.