Approved on August 13, 2014 by the North Carolina Utilities Commission, the 743 area code will be introduced as the relief method for existing area code 336, covering a northern portion of North Carolina with cities such as Greensboro, Winston-Salem and smaller towns like Burlington, Mount Airy or Trinity. The newly approved NPA will overlay 336 (will serve the exact same area).
After a 6 month permissive dialing period, when local calls within area code 336 may be dialed using both 7 and 10 digits, 10 digit dialing becomes mandatory in April, 2016..
- October 24, 2015 – start of permissive 7/10 digit dialing period
- April 23, 2016 – end of permissive dialing period
- May 23, 2016 – area code 743 enters service
See official NANPA announcement and map of the new overlay area (PDF document).