An automatic number announcement circuit (ANAC) provides an automated announcement for determination of the telephone number of a line. In order to determine the phone number of a line a technician or anyone else picks up a phone set plugged into the line in question and calls the ANAC number. The call is answered by an automated system and the phone number from which the call originated is read back to the caller. Bell Canada's lines in Ontario and Quebec can be identified by dialing (area code)+958-2580. The (area code) is the area code of the caller. Lines can also be identified by calling 1-800-437-7950. For more ANAC numbers please consult our source on this Wikipedia page.