Why do fake phone numbers start with 555?

Just ask anyone who had the misfortune of having the number 867-5309...

Ghostbusters
(Image credit: (YouTube))

As soon as an actor in a movie or TV show starts rattling off a phone number, every viewer knows what the first three digits will be: 5-5-5. How did "555" become the convention for fake phone numbers, and are there any real 555 numbers? Let's dial up some answers.

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