Receiving threatening calls can be a distressing experience because you don't know who is sending the calls and you may think that you have no way to stop them. Fortunately, there is a way to trace threatening phone calls. By tracing the calls you can investigate the person who is making them and have the individual stopped once and for all.
Hang up your telephone when you receive the threatening call and pick the receiver up again. Listen for a dial tone.
Dial 57. When you dial this number make sure that you do it immediately after the threatening call has been made. If you do this a couple of hours after the threatening call, the service might trace a different call. According to harwichpolice.com, if you have a rotary dial phone you should dial 1157. There is a fee for this service and you may have to pay your phone company upfront fees or pay every time you dial 57. Contact your phone company for specific details.
Listen to the announcement that comes on after you dial *57. The announcement will confirm that you have traced the call successfully. The traced number will be sent directly to the phone company and the telephone company will record the call.
Obtain an authorisation form. Pioneer.net states that after you dial *57, you will have to call the phone company to verify that you activated the call trace. The phone company will send you an auhorization form which, according to privacyrights.org, must be signed before the traced call is given to law enforcement officials for investigation.
File a police report with your local police department. The police will work with the phone company to investigate the traced calls and the caller.