Cal. Ins. Code § 1610
Any of the acts described in Section 1611, when effected in this State, by mail or otherwise, by a foreign or alien insurer which is nonadmitted at the time of the solicitation, issuance or delivery by it of contracts of insurance to residents of, or to corporations authorized to do business in, this State, is equivalent to and shall constitute an appointment by such insurer of the commissioner and his successor or successors in office to be its true and lawful attorney, upon whom may be served all lawful process in any action, suit, or proceeding instituted by or on behalf of an insured or beneficiary arising out of any such contracts of insurance, and any such act shall be signification of its agreement that such service of process is of the same legal force and validity as personal service of process in this State upon such insurer.
Ca. Ins. Code § 1610