The transition begins Saturday to dialing an area code to make local calls.
From Saturday through January, callers in the 270 area code region are allowed to make calls by dialing with or without the area code.
That transitional period is in place because of a change, beginning in February, that will require callers to use area codes, including local calls.
There are no additional fees for local calls.
To dial long distance, callers still will need to dial a 1 before the area code and phone number.