It's triple zero, used to call the emergency services in Australia. That is the lowest possible number. We did it! Well that was boring. And you, dear reader, probably don't even live in Australia,* so it's not your shortest phone number. Let's come up with a new rule to make this more interesting: Everyone should be able to call the number. That means we'll only consider numbers that can start with an international country calling code. (Count the country code as part of the full number.) We...
