Contact the FCC's Consumer Center toll-free at 888-CALL-FCC (888-225-5322):
Certain rural wireline carriers may have waivers of the porting requirement from state commissions. Customers of these carriers therefore may be unable to port their number to a new carrier. If you are unable to port your number for that reason, you should contact your state commission for further information.
You might also reference "Rules and Regulations of the North Carolina Utilities Commission", chapter 17, "Provision of Local Exchange and Exchange Access Competition", Rule R17-5, number portability and number assignment:
Carl Drueckhammer