Nokia Mobile Secret Codes

As you know today most of the mobile phones are of Nokia.
So as a Nokia mobile user you must know some secret codes of Nokia phones.

Here are some of the Nokia Secret Codes that you should definitely know about.

*#06# - For checking the IMEI(International Mobile Equipment Identity) of your phone
*#0000# - Displays your software Version: 1st line - Software Version, 2nd line - Software Release Date, 3rd line - Compression Type
*#9999# - Phone Software Version (if *#0000# does not work)
*#7760 - Manufacturers Code
*#3283# - Date of Manufacturing
*#7780 - Restore Factory Settings
*#73# - Reset phone timers and game scores.
*#92702689# - SIM Lock Info
*3370# - Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talktime is reduced by approx. 5%
#3370# - Deactivate Enhanced Full Rate Codec (EFR)
*#4720# - Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time.
*#4720# - Deactivate Half Rate Codec.
*#2640# - Displays security code in use.
*#30# - Lets you see the private number.