quote from somewhere:

"I was driving along the other day, when I saw a woman looking into the rear view mirror, trying to apply makeup ...startled me so badly I almost dropped my cell phone into my bowl of soup."

I had a woman using a phone 'almost' hit me awhile back as she veered into my lane as we were turning out of an access road, as she simply couldn't steer the curve with one hand.
Even if one NEVER talked while driving, the cell phone would so much handier than a few short years ago when we had to look for a pay phone and find some change! Pull OVER...even to answer! Phones have a 'missed call' feature....you can call back!