While it's unclear what that means, California's hands-free law, which went into effect last July, states that a driver can't make or receive calls while driving unless using a headset or other hands-free setup. A later law went into effect this January which banned texting and emailing while driving.
However, the fines for both of these are so low as to be ridiculous. Both laws require a $20 fine for the first infraction and $50 thereafter. Thus, it is easy to find cell phone miscreants if you look.
Listen to the video below, and you can hear the paparazzi shout "No more on the cell phone, Maria."