Or, they simply mass dial phone numbers, figuring that there are several million Spanish speaking people in this country and that will no doubt get some of them.  I get a big kick out people always saying that "someone" had to sell a number.  A phone number is 10 digits.  If I dial the right 10 digits, it will cause your phone to ring.  I don't need your number to do that.  I only need your number if I want to address you by your name.  If no one could ever call someone without knowing that particular number, there would have never been "wrong number" calls ever since phones were invented.