Fictitious telephone number
Ranges for fictitious telephone numbers are common in most telephone numbering plans. One of the main reasons these ranges exist is to avoid accidentally using real phone numbers in movies and television programs because of viewers frequently calling the numbers used. In North America, the area served by the North American Numbering Plan (NANPA) system of area codes, fictitious telephone numbers are usually of the form (XXX) 555-xxxx. The use of 555 numbers in fiction, however, led a desire to assign some of them in the real world, and some of them are no longer suitable for use in fiction. Other areas have different fictitious telephone numbers.
To be effective, it must not be possible to change a fictitious telephone number into a real one by adding or changing a few digits. Usually, the number must be unassigned in every area code within the numbering plan. Outside NANPA, special fictitious telephone numbers for mobile phones, premium-rate numbers or toll free numbers are sometimes assigned as well.
Source: https://en.wikipedia.org/wiki/Fictitious_telephone_number
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