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

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