Unknown caller left no message probably scam

Called cellphone.
I don't say anything when connecting to the call, that way most robo dialers don't know there is someone on the other end.
As Red said, probably a scam.

Call Received: 12:32 PM EST, Thu. 12/01/2016
Caller ID: +1 (718) 946-0256 New York, NY
Missed Calls List: I let the phone ring. No message was left. I then blocked the number so that whoever it is that is calling me without a valid reason will be met with frustration.

Rcvd call from this # ystrdy at 1035.
Here's a simple equation to follow:
Unknown caller "+" no msg left "=" SCAM

No message,