Local calls made in parts of East Tennessee's 423 area code, including Chattanooga, will need to be made dialing 10 digits soon because of a new area code: 729.

Starting in early August, people in the 423 area code region will need to dial the full 10 digits for local calls.

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10-digit dialing to be required for East Tennessee’s new area code beginning Tuesday After Aug. 5, calls only using seven digits won’t be completed and will be routed to an announcement.

All customers with the 423 area code should prepare for mandatory 10-digit dialing and the introduction of the new 729 area code.

Many east Tennesseans will soon have to adapt to dialing 10 digits for local calls, as the area gets a new area code.

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