I will ask you the same question I ask everyone else...why is it necessary to talk on, or do anything for that matter, with a cell phone while you're driving? Doing anything with a cell phone while you're driving is an unnecessary distraction. There is nothing going on in anyone's life that can't be dealt with on a phone either before a person leaves in a vehicle, or after they arrive at their destination. If something is so pressing that it can't wait until they arrive, they can pull over into a parking lot and do whatever...point is, it doesn't NEED to be done while driving...
what is a need for one person, may or may not be a need for another .... for me there is no need for loud music playing on a vehicle's radio, for me there is no need for transporting a pet that is all over the passenger compartment, for me there is no need for hauling so much stiff inside the vehicle that it blocks vision out the rear window .... in short, I determine what are necessary distractions for me .... others have the same right .... I also believe that I should take responsibility for managing those distractions .... if I look down to adjust something on the dash and cause an accident, that's my fault ... as to possible needs for use of a cellphone (some rather serious, others not so serious), scheduling business, responding to family emergencies, exercising freedom of speech, responding to business emergencies, helping keep someone awake, being told to pickup something on the way home so as to not require an additional trip, calling 911 to report a drunk driver/accident/whatever, etc .... bottom line as stated above, its one thing if using a cellphone for conversation was truly dangerous, truly presented a clear and present danger, directly contributed to a significant number of accidents .... its quite a different matter if some folks are trying to force a pet peeve on others