Nokia Secret Codes

To check the phones Software revision for Nokia Mobile.
              In the main screen type *#0000#
To enter in the secret menu in Nokia Phone             
              In the main screen type *#92702689#. The secret main screen will be displayed. In the secret main screen you find the following informations.             
  1. Displays Serial Number.
  2. Displays the Month and Year of Manufacture
  3. Displays (if there) the date where the phone was purchased (MMYY)
  4. Displays the date of the last repair - if found (0000)
  5. Shows life timer of phone (time passes since last start)
To restore Factory Settings for Nokia mobile
Press *#7780# for restore factory settings.     

Hiding your Mobile/ Cellphone Number
         Go to: Menu > Tools > Settings > Call > Send My Caller ID >'Yes', 'No' or 'Set By Network' to follow the default settings of your home network. It works only with very few network who provide you facility of “Private Number”
Speed Dialing From Simcard contact (not stored in mobile phonebook)
  Type number followed by # then call.
  Example:     1#      or      2#      or      21#