In the early days the first digit in a phone number could not be 1 or 0. (1 was reserved for long distance calls and 0 was reserved for operator) Back then, every telephone started with a prefix. read more
In the early days the first digit in a phone number could not be 1 or 0. (1 was reserved for long distance calls and 0 was reserved for operator) Back then, every telephone started with a prefix. To make it easier to remember, that prefix was written as letters. read more