Cal. Public Utilities Code § 2889.3

(a) (1) Before a telephone corporation exits the business of providing interexchange services to all of its customers or to an entire class of its customers, the telephone corporation or any person, firm, or corporation representing the telephone corporation, shall provide those affected customers with a written notice at least 30 days prior to the proposed transfer of those customers to another telephone corporation. The notice shall include all of the following: (A) A straightforward description of the proposed transfer. (B) All applicable rates, terms, and conditions of the new service. (C) A statement of the customer’s right to transfer to another telephone corporation. (D) A toll-free customer service telephone number for the purpose of responding to customers’ questions. (2) Any transfer of customer services shall be effectuated without charge. (b) Subdivision (a) does not apply when the telephone corporation has entered into a written contract with the customer and when the change in telephone corporation results in no rate increase for the customer.