(1) Each operator service provider must post on or near each telephone instrument subscribed to its service, in plain view of consumers:

(a) the name, address, and toll-free telephone number of the operator service provider;

(b) a written disclosure that its rates are available upon request;

(c) dialing instructions detailing operator service provider dialing procedures as well as instructions for accessing the local exchange company operator; and

(d) emergency dialing information.