How do phone companies move landline numbers to new locations?

Question

How do phone companies move landline numbers when a business relocates from one address to another within the same exchange? Did a business, say in the 1960s or 1970s, have to change numbers when moving to a different location?

In: Technology

Answer 1

Well they also did it for residential. I remember moving and since it was within the same exchange we were able to keep the same number.