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.
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