When will I be required to dial a 10-digit number for local calls? The FCC adopted a new three-digit suicide prevention hotline number, 988. With the introduction of 988, the United States will require 10-digit dialing. This means that all local calls will require parties to dial 10-digits. Under that dialing approach, you will dial the (area code) – (prefix) – (last four digits). (Long distance calls will continue to require 1+ dialing.) Start practicing your 10-digit dialing and updating stored numbers in your devices today! 10-digit dialing will be required starting October 24, 2021. For more information, please visit the North American Numbering Plan Administrator (NANPA) website.