An exiting CLEC must make transfer arrangements with the telephone numbering administrator at least 66 days prior to the migration (or by such earlier date as may be specified by the code administrator) for any NXX codes or thousand number blocks assigned to it. Applicant states that it does not have any NXX codes or thousand number blocks assigned to it that are used exclusively for serving its residential customers in AT&T California's service territory. All telephone numbers assigned to Applicant's affected residential customers come from AT&T California's numbering inventory and already belong to AT&T California. Thus, there is no need to transfer NXX codes.