Calling random or consecutive phone numbers is essentially a spraying attack. That can be done without having a database of numbers. While they are annoying, they cannot be used to attack a person or a group of people without additional information. That's what I mean in saying that the numbers alone cannot be weaponized.

Australian mobile phone system has a capacity of 100M numbers, which means that with a probability of 1/4 a random phone number is a real one (Australia's population is nearly 26M).