Who called from 2129203464

Same here. Hung up on answering machine.

The posters on this board: http://800notes.com/Phone.aspx/1-212-920-3464
seem to have come to a consensus that this number may be a telemarketing number belonging to the Metropolitan Opera House.

the Metropolitan Opera House sounds correct. I got frequent calls from them for donations, and also one from this number. seems to make sense.

The Met sounds right to me as well.  I've gotten about 5-6 calls with the same results since January.  Extremely annoying.

It is a company named "Global Crossing Local Servcies, Inc"
Location: New York City, NY
I found this same information when I did reverse look-up for the Caller ID number that keeps calling our phone.