My friends and I have had spats about the legality of two road rules--first, is changing lanes in an intersection legal, and second; is talking on a cell phone while driving legal? The answer to both is YES.
It is perfectly legal to change lanes in the middle of an intersection. There is no rule that outlaws this, although you may be ticketed under the blanket offense called an "unsafe lane change." Whatever. I'm okay with that.
It is also perfectly legal to talk on your cell phone while driving...for now, anyway. California is joining New Jersey, New York, Connecticut, and the District of Columbia in banning motorists from talking on phones (unless they use a headset or speakerphone), although the law won't take effect until July 1, 2008, to educate the public. (I couldn't find confirmation for this date...if anyone knows, let me know.)