KNOXVILLE, Tenn. (WVLT) - With a new area code coming to East Tennessee in September, 10-digit dialing will be required beginning next week.

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

To help facilitate the creation of “988”, area codes that use “988” as a local exchange, or the first three digits of a seven-digit phone number, will need to use 10-digit dialing." ...

Current telephone numbers, including area codes will not change On March 21, 2015, customers in the 740/220 area code will be required to dial 10 or 11 digit phone numbers for all local calls ...