Who called from 6469711635

Rec'd call.  No message.  Caller ID:  New York, NY    Will block
According to whitepages.com     This # is invalid

My sources disagree with you, identifying the VOIP carrier Neutral Tandem. Whether it's truly in service is another matter.

I believe it's the same SEO fraud caller which used a neighboring number in May. I can't confirm as the dialer abandoned each time it detected my voice mail.
http://800notes.com/Phone.aspx/1-646-971-0456

They are scam . Block then  646-971-1635

called my cell, didn't leave a message.  Has called twice before, never leaves message.

Called several times within the span of 4 hours leaving no message on my voicemail.