Walker,
they must be in full swing today, because I too got a call on May 24th, right around 10:52 AM EST (about 20 minutes ago).  I just finished work for the next few weeks due to maternity and actually came online to look and see if it is a legit call that I should bother with or a scam.  I too will trust what Mr. Whodatcat said and take it as a scam.  People amaze me; I could never imagine trying to take advantage of senior citizens like that.  My husband's grandmother, who lives in Texas, fell for one the other day the needed to 'verify her bank' information.  It's horrendous to me what people will do.

As an additional note, I did *not* pick up as I was doing laundry and missed the call regardless.  Now I'm glad I didn't.

I get multiple calls daily from 312 239 3612. They never leave a message but let the voice mail fill up with the sound of "nothing." When I do answer, they say nothing.

They called me, too.  I don't know where they got my number, but I let it go to voice mail.  They did NOT leave a message.

According to a Google search:
Phone number: 312-239-3612 is located in Chicago, Illinois.

Its exchange 239 is managed by
LEVEL 3 COMMUNICATIONS, LLC -.

The number is currently on switch number CHCGILGMDS2 (switch is a technical specification for phone hobbyists).

Around 50% of people reported it as "Recorded Message"

Others have reported them as people scamming senior citizens.

The call is an auto call and wont stop bothering me! When I called them back to ask them to take me off of there list I got another recording that says "I'm sorry. There's no one to talk to you right now. Good-bye"