The number "555-123-4567" is a fictional telephone number commonly used in movies, television shows, and other forms of media. The prefix "555" is designated by the North American Numbering Plan to prevent the use of real phone numbers in entertainment, ensuring that viewers do not accidentally call a real person or business. In the context of media, characters often use numbers like "555-123-4567" to communicate, adding realism to the storyline without infringing on privacy. This practice helps maintain the illusion of a real-world setting while protecting individuals from unwanted calls or harassment.