When did phone numbers change to 7 digits?
multipleQAs
When did North American plan to change all phone numbers to 7 digits get accepted? When was the first new area code received by a locale, an indication of when North American phone numbers changed to 7 digits? When was the first customer call using the NANP made, an indication of when North American phone numbers changed to 7 digits?
October 1947
1947
November 10, 1951