Cal. Pub. Util. Code § 2896.1
A provider of commercial mobile radio service, as defined in Section 216.8, shall provide access for end users of that service to the local emergency telephone systems described in the Warren-911-Emergency Assistance Act (Article 6 (commencing with Section 53100) of Chapter 1 of Part 1 of Division 2 of Title 5 of the Government Code). "911" shall be the primary access number for those emergency systems. A provider of commercial mobile radio service, in accordance with all applicable Federal Communication Commission orders, shall transmit all "911" calls from technologically compatible commercial mobile radio service communication devices without requiring user validation or any similar procedure. A provider of commercial mobile radio service may not charge any airtime, access, or similar usage charge for any "911" call placed from a commercial mobile radio service telecommunications device to a local emergency telephone system.
Ca. Pub. Util. Code § 2896.1