They've called me three times now on three different days, and hung up. Caller ID shows "Unavailable." I'm guessing there is some pretty sophisticated spoofing going on here.
No voicemail was left. I don't answer calls from unknown numbers either, tho my phones' caller id just said Chicago, IL and the phone number. Seeing that there are only two other postings about this number in the last 5 months, doesn't give a clear idea of who's calling.
Called me 3 times today with no message left. At first I thought it was a wrong number, since I live in the same area code, but, now I've blocked them.