What is the right way to use a cellphone while driving?

• You can use the cellphone when the traffic is less
• You can use the cellphone whenever you like if you are a pro driver
• Pull over, when safe to do so, to the side of the road when using a cellphone
  Explanation:

  "Pull over, when safe to do, to the side of the road when using a cell phone, including a hands free phone"
• Cellphones are not allowed in the car