Safety Precautions
The use of cellular phones in an aircraft:
Turn your phone OFF before boarding any aircraft.
Use it on the ground only with crew permission.
Do not use the phone while you are in the air.To prevent possible interference with aircraft systems, Federal Aviation Administration (FAA) regulations require you to have permission from a crew member to use your phone while the plane is on the ground. To prevent interference with cellular systems, FCC regulations prohibit cellular phone use while the plane is in the air.
NEVER use your phone while driving, 
even if hands free operation is allowed. ALWAYS park your vehicle first.
Check the laws and regulations regarding cellular phone use in the areas where you drive. In some states and countries it is illegal to use mobile and radio telephones while driving.
Turn off the phone at a potentially explosive atmospheres such as below deck on boats, fuel or chemical transfer or storage facilities, and blasting areas. It is rare but the phone or its accessories could generate sparks, which in the
The power cord is damaged. 
The phone has been dropped or undergone a shock.Have an authorized service center repair the phone. NEVER try to repair the phone yourself.
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