Telephone numbers have evolved over the years as the technology has become better and the number of phones have increased. The traditional American phone number includes a three-digit area code, then a three-digit exchange, followed by the four-digit line number. Exchanges began as the first two letters of a geographic location, such as 222 in Manhattan originally standing for AC2 – Academy 2. As more cellular phones and fax machines required new numbers, new area codes were created, each serving a new set of exchanges. Writer Bio
