The telecommunications industry also looks at dialing patterns to identify communities of interest. Exhaust - A point in time at which the quantity of telephone numbers within an existing area code equals zero. FCC - Federal Communications Commission. Geographic Split - The exhausting area code is split into two or more geographic areas, leaving the existing area code to serve one side of the geographic area and assigning new area codes to the remaining areas. Growth - Growth and demand for telephone numbers are not specifically tied to population.
Growth is measured in the demand for telephone numbers.
LNP - Local Number Portability. NANC - North American Numbering Council. NANP - North American Numbering Plan. PCS - Personal Communications Services.