WHY DO PHONE NUMBERS IN MOVIES ALL START WITH 555?
Phone numbers in movies and television shows usually begin with the fictional prefix 555. The reason why a fictional prefix was chosen for all onscreen phone calls is one of privacy.
A few decades ago, the first letters of exchange names were used as part of telephone numbers in the U S , followed by numbers. The number five on the dial corresponded with the letters J, K and L, but no exchange-name abbreviation could be made with any combination of these three letters.
Instead, the 555 prefix was allocated to service provider's numbers, such as the directory assistance number, which is 555-1212. Anyone attempting to call a number used in a movie or television show would therefore be able to contact only a service provider, not a registered phone customer, which removed the potential for viewers to harass other customers (There have been instances where 555 numbers were not used on television and a multitude of crank calls have been made to the number )
In order to stop any further confusion from disrupting service providers, the numbers 555-0100 to 555-0199 are now specifically reserved for fictional use.



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