Who called from 2139736461

This number has called me twice today, morning and afternoon. Didn't answer and no message left.

Me too - hang up call to cell.  My guess - robo call fishing for good numbers to sell list to who knows.

Called my unlisted number. I have no clue as to how they obtained it. No message left, no caller ID.

Your number was dialed by a computer that dials every number in a selected geographic area or area code.  EVERY telephone number is dialed in sequence...your number just came up.  There are 7 pages of complaints (so far) in just a few hours - and this represents only about 1% of the numbers that were actually called.

Didn't pickup call. No voicemail left