Who called from 6040000000

Received the same call this morning, 2/3/13.  I did not answer; no message was left.

Received the same call this morning, 2/3/13.  I didn't answer, and no message was left.

I also live in Hawaii and get these phone calls several times a day.  When I pick up there is no one there.  Helpless!

i just received a call from 604 000 0000 at 11:10 am september 15 2014 he claimed that it was from a cable company i knew something was up since it wasn't a specific company. i heard a male voice and he was speaking of something about installing something on the tv tommorow between 12-4. and i received the call from surrey BC

Got a call from this 604-000-0000 number. This is unwanted and called an official cell phone. Please advise.