SACRAMENTO – Californians who want to talk on the phone while driving will have to invest in a hands-free headset or use speaker phones under a new law signed by Gov. Arnold Schwarzenegger this morning. The law, which will take effect in July 2008, prohibits motorists from holding a cell phone while driving. It establishes fines and requires motorists to use hands-free technology, such as Bluetooth or an earplug. The law is intended to cut down on traffic accidents. Hand-held cell phones contributed to six fatal accidents in the state last year, according to the California Highway Patrol. For Californians,...