How were the emergency phone numbers chosen in different countries?

Photo by robinsonsmay - CC-BYMost countries have a short phone number to contact the police, fire or ambulance services. In the United Kingdom the emergency call number is 999, and was introduced in 1937. But why was 999 chosen? Back then, the digits from 2 to 8 were used at the start of regular telephone numbers. The telephone dial [more…]

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