All competitive local exchange companies are subject to the requirements of this chapter regarding purchase of essential telecommunications services, section 49-21-01.4; access code number usage, section 49-21-01.5; call identification services, section 49-21-01.6; cross-subsidization, section 49-21-02.2; unauthorized telecommunications service, section 49-21-02.4; price schedules, sections 49-21-04 and 49-21-05; price complaints, section 49-21-06; discrimination, section 49-21-07; dialing parity, section 49-21-08.1; connections, sections 49-21-09 and 49-21-10; refunds, section 49-21-10.1; and quality of service, section 49-21-10.2.