The one in CA has teeth. CHP says they will start pulling people over at midnight tonight.
From the Everett Herald article:
Of the places with a statewide ban, only Washington state makes it a secondary offense, said Jonathan Adkins, a spokesman for the Governors Highway Safety Association, which represents highway safety offices nationwide.
In Washington, drivers face a $124 ticket for violating the ban. They can still use hands-free devices such as earpieces, wireless headsets and speakers. By comparison, California's fines are much lower at $20 for the first violation and $50 for subsequent violations. While adult drivers can talk on a hands-free device, drivers under 18 can't use a cell phone whether it's hand-held or hands-free.
There are no age restrictions in Washington.