Distracted driving
Using cell phones when you should be focusing on the road is just wrong and unsafe. When you're having a conversation with someone, you're paying attentipon to what they say and not what the driver in the next lane is doing.
If the conversation is realy yhay important, pull over for two minutes and work it out. Don't endanger the lives of the rest of us on the road around you. Or of those crossing the street in front of you.