They hung up after a few seconds when my machine picked up.  I was hoping it was from an employer I applied to, and it turned out to be another one of these kinds of calls.  It was right around lunchtime, 1:30 pm.

I get a LOT of these calls, even on my cell phone now which I didn't before.

I see so far no one else has gotten one.  It might be an innocent wrong number since it's not toll-free.  But unwanted calls can come from any number.