When a customer migrates from one local exchange company (LEC) to another, where applicable, the carriers involved must perform local number portability (LNP) in compliance with the Federal Communications Commission (FCC)-approved method and time frame for disconnecting that service following the scheduled port under Title 47, Chapter I, Part 52.26 of the Code of Federal Regulations. Part 52.26 adopts the North American Numbering Council (NANC) recommendations on local number portability administration, "Working Group Report" with certain qualifications and additions. The effective date for 47 C.F.R. §52.26 is stated in WAC 480-120-999.

When the underlying carrier is providing local exchange services for resale by a LEC and then facilitates migration of that service to another LEC or back to itself, the underlying carrier shall notify the old LEC when the customer's service has been transferred.

The requirements of this section do not apply if the customer submitted the cancellation order directly to the LEC providing existing service.