(WCYB) — All local calls made in the 423 area code of Tennessee must be dialed using 10 digits beginning Tuesday. Calls using just 7 digits will not be completed, and will be routed to an announcement ...

Starting Oct. 7, all metro Detroit residents will be required to dial 10 digits to complete calls in preparation for the 679 overlay.

East Tennessee has another new area code, and it's going to add three more digits to many people's local calls. Starting Aug. 5, people in upper and lower East Tennessee in the 423 area code region ...

State officials announced the new area code in March, when they began a "permissive dialing period," in which 313 callers were urged to practice using 10-digit dialing for every call, though ...