Cell phones take a driver's attention off the road and place the driver and other motorists at risk.
If you must make a call, it's wise to pull over. If you must have a phone in your car, select one that's easy to operate. The microphone of a hands-free system should be installed in the sun visor. But be careful not to look at the speaker when you talk. You should place the handset in a convenient, comfortable place that allows the driver to sit and drive normally.