Toot

Rule 1: the area code cannot start with 0 or 1. This is to prevent it from being interpreted as an international or long distance call prefix.

Rule 2: the second digit of the area code cannot be 9. I don't know why this rule exists, but it does!

Rule 3: the exchange code cannot start with 0 or 1 for the same reason.

Rule 4: the exchange code cannot end with 11 to avoid being interpreted as a well-known number, e.g. 911.

I would not be surprised if rules 2 and 3 disappear at some point, and possibly rule 4, but rule 1 will likely never disappear.

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