What is Flight Mode or Airplane Mode in Mobile Phone || Top 4 Uses of Aeroplane Mode

What is Flight mode or Airplane mode?
Top 4 uses of flight mode.
Advantages of flight mode or airplane mode in our daily life.
Benefit of using Flight Mode in Mobile.
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Here is BBC News Link for reference
http://news.bbc.co.uk/2/hi/health/5106510.stm
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