Who called from 2560000000

I am in Daly City, CA and got same call , same recorded voice telling that was a wrong # when I said Hello ...  bull....

I got the same call on cell, 04/01/2011.  No response.

I got the same call on cell, 04/01/2011.  No response.

I just got called but didn't answer, I live in Indiana.

I answered this call because (256) is the area code for Huntsville, AL which is not too far from here.  As soon as I said our business name the party/computer on the other end hung up.  Obviously (256) 000-0000 is not a valid number.