The exact reasons are unknown.
However, some points are clear. First, most (but not all) telephone companies in the United States and Canada reserved the N11 codes (N = 2 through 9) for special purposes; for example, 411 was used for directory assistance (directory inquiries) well before 911 was introduced for emergency calls. For that reason, the eight N11 combinations were never used for either area codes or exchange prefixes. Of the eight N11 codes, 911 is the least likely to be accidentally dialed by user error or equipment fault, and yet it is easy to remember and easy to dial.
The 911 emergency number was introduced in some parts of Canada and the U.S. beginning in 1968, but it took many years to spread nationwide.
"911" is the US telephone number for emergency services.
911
911 for help in an emergency call a friend if it is not an emergency
It is free, but only call this number in an emergency situation.
For an emergency in the U.S. you call 911. For a number for the police station to call the police in a none emergency, every town has a different number for their local police department.
Well, The number one step is not to panic. Or you could end up being the emergency!
In the United States you should call 911. In other countries, call the country's emergency number.
Depending on your location (such as a factory), it may have its own number to call. Otherwise, call the emergency number 911.
911 is the single dail-up number to call police, fire, ambulance, etc.,. in emergency from anywhere in USA.
999 911
Call 911 (in America) or your local emergency number.
It all depends on the situation. If you are in an emergency in the USA you should call 911. In the UK it is 999. After you have been in an accident and already called 911 call 411 PAIN. if you cannot find the phone number for the person you wish to call dial 0 and the next available operator will be at your service.