You now have about three-weeks on O'ahu to free your hands up, or risk not talking or texting on the phone in the car while driving. The concept sounds reasonable- make our roads safer. Of course, reading and eating while driving, while stupid, is still perfectly permissible. Any hand-held device is banned while operating a moving vehicle, so be very clear on what this means.
It means you can't make a quick call or receive one while stuck in traffic or at a red light. It means you can make emergency calls- which means 911. It means you can use a walkie-talkie device, but you will have to prove that's what you were doing to the judge if ticketed. It means that if you are caught, you will be fined $67, with subsequent fines as high as $500. It means you will have to get a hands-free device, or figure out how to get from here to there without the use of your invaluable cell phone companion.