Who called from 3205550000

I have gotten a couple calls from this number.  When I answer, nothing.

This number called three times throughout the day on Sunday 11/2.  We answered once, and it hung up.  It went to answering maching twice and hung up less than half way through our announcement.

I've had a few calls from this number and I tryed to call it back the operater answers saying that it cant connect my call.