Urgent! Did the 9 1 1 alarm telephone number in the United States exist before or after the 9. 1 1 incident?

1968 at &； T announced that the designated number 9 1 1 was the national emergency number, and the number 9 1 1 is still used.

It is precisely because of this number that the terrorists chose September 1 1, which has a special meaning, that is, to warn the United States that you are doing well now and be careful to pull the list in the future.

In fact, if your mobile phone is an old Motorola phone, the only emergency number you can call without a SIM card is 9 1 1.