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In 1968, a solution was agreed upon. AT&T had chosen the number 911, which met the requirements that it be brief, easy to remember, dialed easily, and that it worked well with the phone systems in place at the time. How the number 911 itself was chosen is not well known and is subject to much speculation. However, many assert that the number 911 was chosen to be similar to the numbers 2-1-1 (long distance), 4-1-1 (information, later called "directory assistance"), and 6-1-1 (repair service), which had already been in use by AT&T since 1966. Also, it was necessary to ensure that the 9-1-1 number was not dialed accidentally, so 9-1-1 made sense because the numbers "9" and "1" were on opposite ends of a phone's rotary dial.