(1) A data retention implementation plan for a relevant service operated by a service provider:
(a) comes into force when a Communications Access Coordinator notifies the service provider of the approval of the plan; and
(b) ceases to be in force in relation to that service:
(i) if the service provider was operating the service at the commencement of this Part--at the end of the implementation phase for this Part; or
(ii) if the service provider was not operating the service at the commencement of this Part--at the end of the period of 18 months starting on the day the service provider started to operate the service after that commencement.
(2) The implementation phase for this Part is the period of 18 months starting on the commencement of this Part.