Except as provided in subsection (c)(1) of this section and subject to subsection (c)(2) of this section, a public service company shall file with the Commission a tariff schedule of its rates and charges for its regulated services and for standard offer service as provided in § 7–505(b)(8) of this article. As ordered by the Commission, a public service company shall: plainly print the tariff schedule of its rates and charges for its regulated services; make available the tariff schedules for public inspection; and post the tariff schedules to make the tariff schedules readily accessible to and convenient for inspection by the public. A telephone company that is regulated using an alternative form of regulation under § 4–301 of this title for baskets of services is not required to file with the Commission a tariff schedule of its rates and charges for its regulated retail services that are included in Basket 4 “Discretionary Services” and Basket 5 “Competitive Services”. A telephone company that is not regulated using an alternative form of regulation under § 4–301 of this title for baskets of services is not required to file with the Commission a tariff schedule of its rates and charges for its regulated retail services that, as determined by the Commission, are similar to the services included in Basket 4 “Discretionary Services” and Basket 5 “Competitive Services”. Notwithstanding any other law, except as provided in paragraph (1) of this subsection, if the Commission finds after notice and hearing that it is in the public interest, the Commission may allow a telephone company that has 20,000 or fewer subscribers to provide a regulated service without requiring the telephone company to file a tariff schedule of its rates and charges for the regulated service. The Commission may issue orders or adopt regulations that the Commission determines necessary to regulate a service in which a telephone company is not required to file a tariff schedule of its rates and charges under this subsection.