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Why is it necessary to dial the area code and the 7-digit telephone number (10 digits) for local calls with an overlay?

April 26, 2017area code Dial digits local necessary telephone

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Why is it necessary to dial the area code and the 7-digit telephone number (10 digits) for local calls with an overlay?

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This is also a FCC requirement. With an overlay, two area codes exist in the same geographic area. As a result, the area code is needed to properly route the calls to the correct destination. The 10-digit dialing requirement also avoids disadvantaging newer providers and promotes the goal of having a numbering system that is competitively neutral.