Recommend telling your kids that back in the day the length of time it took to dial a phone number was proportionate to the sum of its digits
Where 0 counts as ten. The original 1947 plan had all full state area codes (and only full state area codes) get a zero as the second digit. That part didn't survive into the widespread public implementation. But giving Puerto Rico 809 and Alaska 907 while North Dakota gets 701 really sent a message. (Note that direct dial started in 1951, while Alaska only became a state in 1959.)