While it is already law, starting August 1, 2019, police may conduct a traffic stop for anyone using their cell phones while driving, if the phone is not in a hands-free mode.
This means you cannot text, call, search the internet, scroll through your contacts list, or make modifications to your GPS navigation, etc. while moving (this includes while idling at a stop light). While you can still use voice-to-text, be aware that, should you be stopped, there is no way for you to prove that you used your voice (and not your fingers) to send the text.
If you are caught, you will likely be charged with a petty misdemeanor and a $50 fine for the first offense. Subsequent violations carry a $275 fine.