Source: Montana State University Police Department
Anyone can be the victim of harassing, annoying, obscene, or threatening telephone calls. These may include random calls by pranksters, calls late at night, frequent pointless calls, calls where nothing is said, obscene calls, calls from former romantic interests, or threatening phone calls.
These calls are intended to upset you, either for revenge or to gratify the caller’s personal urges. Most can be prevented or avoided by learning and using some simple techniques to decrease your potential for victimization.