What is the California hands-free cell phone law that driving instructors must teach students?

1. Cell phone use is permitted if the driver uses speaker mode while holding the phone
2. Drivers may only use a cell phone in a hands-free mode, and drivers under 18 may not use a phone at all, even hands-free
3. Cell phone use is prohibited only in school zones
4. Drivers may text at red lights as long as the vehicle is stopped