(1) Interexchange carriers may revise a price list by filing a proposed new price list with the commission which complies with the provisions of this subchapter, and mailing a copy to the commission's interexchange carrier mailing list at least seven (7) days prior to the proposed effective date of the new price list. The interexchange carrier must simultaneously file a certificate of service which affirms compliance with this rule.

(2) A proposed new price list becomes automatically effective for services rendered seven (7) days after filing and service is completed pursuant to subsection (1) ; no commission action or approval is necessary.

(3) If an interexchange carrier files a proposed new price list which designates an effective date more than seven (7) days after a filing made pursuant to subsection (1) , the new price list becomes automatically effective for services rendered after such designated date.