An obscene phone call, as the term is commonly used, is an unsolicited telephone call where a person derives sexual pleasure by using sexual or foul language to an unknown person. (There are many varieties of consensual sexual phone calls.) Making obscene telephone calls for sexual pleasure is known as telephone scatologia and is considered a form of exhibitionism. It is usually classed as a paraphilia from a medical viewpoint, in the DSM under the heading "Paraphilias Not Otherwise Specified", although from the viewpoint of the recipient of the calls, it is generally considered to be both a form of sexual harassment and a form of stalking. In some US states, making obscene telephone calls is a Class 1 Misdemeanor. In the United Kingdom, obscene phone calls are punishable up to £5000 and imprisonment under the Criminal Justice and Public Order Act of 1994.
Generally, unwilling recipients of obscene phone calls are advised to simply hang up on obscene callers, and to report the incident to the telephone company and/or the police. Even when Caller ID is not shown, calls are logged by the telephone company, so the perpetrator's phone number can be discovered. However, many people who regularly engage in obscene phone calls use payphones or prepaid cell phones, and in these cases, a more extensive investigation is necessary.
The demographic that most commonly commits obscene phone calls ranges from the age of 12 to 16 years, with an average of 14 years of age. Often they are emotionally or behaviorally maladjusted and have shown previous signs of sexual abuse, as well as having already committed sexual abuse. Obscene phone callers are often male, feel inadequate, have feelings of isolation, have trouble forming relationships and consider making obscene phone calls to be the only way that they can sexually express themselves.