The safest precaution that you can take regarding the use of cellular phones and driving is:

Use hands-free devices so you can keep both hands on the steering wheel.
Keep your phone within easy reach so you won't need to take your eyes off the road.
Review the number before answering a call.
All of the above.
Explanation

Using a cell phone while driving is a major source of distraction and increases the risk of a crash. In California, it is illegal to text while driving or use a phone in any way that takes your hands off the wheel. Adult drivers may only use a cell phone in hands-free mode, and only when necessary.
If you must use a phone, it should be mounted on the windshield, dashboard, or center console in a position that does not block your view of the road. To answer calls legally, use a single swipe or tap on the mounted phone without holding it.

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