I do not answer to numbers with which I am not familiar. Rather, I wait and answer by using another phone I have at home. The answer begins with some Chopin´s music, and then a message, "Stay on the line, your call is important to us." Music again. Finally, a voice: "Good bye." I saved the number in my cell as "Telefucker No. so, so." So when they´ll call again, I´ll see it and don´t aswer. What bothers me is that even with your cell phone you are not free from those telefuckers and that they are growing in number.