Did you know that telephone harassment is not only annoying it is illegal. How illegal depends on the nature of the calls. Threats of physical harm can be a criminal offence. Calls meant to cause mental stress can also be fined, and the fines often increase with the number of occurrences. Even bill collectors harassing you when you tell them to stop contacting you is illegal harassment and you can sue them. There are several way to trace back to find out where harassing calls come from and you should learn all of them. Everything from reading the caller ID to dialing back with *69 or having the police put a trap trace on your phone can help find the harasser.