Some important things to note down :

Types of RESET a Mobile Phone :

 i>Hard reset       ii>Normal reset                                                                                                                                                                      
i>Hard reset: It resets the customization and settings and the internal memory.  
ii>Normal reset: It resets the customization and settings                   
Hard reset code for:
  i>Nokia:  *#7370#  
   ii>Samsung:  *2767*3855          


   Normal reset code for: 
 i>Nokia: *#7780#

File format supported by handsets:   

   1>Image:  .jpg, .bmp.   2>Song: .wav, .mp3, .mp4 etc..   3>Video:  .flv, 
Shortcut key to access internet: 1>Nokia: ‘0’, ‘i’,      2>Samsung: i, c       3>Sony eryction: (*) this sign.

Security code: 1) Nokia12345, 2) Samsung, Motorola, Sony eryction0000