So, your driving along with others in the car, and your phone feature comes on. You really don't want others in on your phone call, nor is it any one's business who your phone call is from. So, you now have to do some quick canceling. Your owners manual will give you a couple of ways of dealing with this. One way is to cancel the call all together by hitting the cancel button on your steering wheel. (if so equipped) Just be mindfull of not taking your eyes off the road to find what feature you're looking for and what to press.