Called me today, don't know who it is...

Called me, I answered and after a couple of seconds they hung up.

Same here.  I am beginning to wonder if these calls just test the lines to make sure the number is valid before they start calling.  I block these numbers and it seems after some of these hangups calls the junk call volume picks up.  I have over 150 blocked numbers that hear a busy signal and they just keep coming.

They called regarding an unpaid Federal student loan which I have NEVER had.