Cal. Pub. Util. Code § 7904

Every agent, operator, or employee of any telegraph or telephone office, who wilfully refuses or neglects to send any message received at such office for transmission, or wilfully postpones the transmission of the message out of its order, or wilfully refuses or neglects to deliver any message received by telegraph or telephone, is guilty of a misdemeanor. Nothing in this section shall be construed to require any message to be received, transmitted or delivered, unless the charges thereon have been paid or tendered, nor to require the sending, receiving, or delivery of any message counseling, aiding, abetting, or encouraging treason against the Government of the United States or of this State, or other resistance to the lawful authority, or any message calculated to further any fraudulent plan or purpose, or to instigate or encourage the perpetration of any unlawful act, or to facilitate the escape of any criminal or person accused of crime.