Who called from 3128009006

Phone rang. I answered. No response on the other end. They hung up. I called the number back. No ringing, just silence for about 25 seconds then a recorded message saying, "All circuits are busy now.  Please try your call again later.  Message 4 switch 21-7."

Called and didn't leave a message. Chicago area code - I don't know anyone in Chicago.

Same as others -- rang, hung up after a few rings.

Got call and robo answered telling me about good deal for boat trip. Hung up didn't care to hear rest.

I answered the phone and it was an automated message saying I won a wedding cruise press 1 to be connected with a travel agent or press 2 for the do not call lost.