Got acall from this number (251-207-9003) 7:51 pm  on 2-4-13.
When I answered the caller hung up

How do I find out who these people are? They called the home someone I know but no one related or close to me. I didn't even know this person's home phone number. I want to find out who these people are so I can REPORT them to my law enforcement.

Missed call from 1-251-207-99003.  They tried to leave a voice mail.  I could understand anything that was said. GRRR

The message said "I am Dan Fulton from the US census bureau. Please call as soon as possible @ 228xxxxxxx."   Note the call came in from Alabama but he gave a Mississippi call back number. I did not post the call back number because it may be to an innocent person. This voice mail was left May 13 @ 4:31am.

Don't worry about this call, it's legitimate.  This is your AT&T cell phone voicemail system telling you you have a voicemail.  Check for yourself by pressing your menu, then message button and scrolling down to voicemail server.  There you will see this number.