Overlay
A relief method that adds a new area code to the same territory as an existing one instead of splitting it. Existing numbers keep their code; new numbers may get the new code. Overlays require ten-digit local dialing.
A relief method that adds a new area code to the same territory as an existing one instead of splitting it. Existing numbers keep their code; new numbers may get the new code. Overlays require ten-digit local dialing.