Block websites on a cell ?

I have AT&T and we called them and they will block certain numbers,,,like the 809 area codes that are charging people $2,000K per minute when you make the call to that area code. There is currently a scam going on where somebody from the 809 area code calls your cell or home number and leaves a message that a member of your family is hurt or something similar so that you will call the 809 number back.