Many time we want to format our mobile phones due to virus or any other bug to reset our phone and remove the bug or virus. It is recommended to take backup of your data in phone memory and external memory before you format your phone as all the data will be erased and due to which you may lose some important files.
It is quite easy to format your Nokia Cell Phones, just a small procedure but yet you should be careful and sure about you want to reset all the functions and data of your cell phone.

 Note:
  • Make sure your battery is fully charged, if formatting is disrupted then your phone will be unusable
  • This procedures are applicable for Java and Symbian Nokia Phones
First Procedure:
  • Go to your home screen of your cell phone
  • Type *#7370# if this won't work type *#7780#
  • Enter the phone security code
  • Your cell phone will restart
Second Procedure:
  • Switch off your cell phone
  • Press *,3 and dial button (Green button) at once  for model like Nokia 5800 XpressMedia  you need to press camera, red and dial button
  • Switch on your cell phone
  • Your phone will be formatted while it starts
This procedure is helpful for formatting phones when your phone don't even starts.