Nokia Mobiles Secret Codes

I found these code on the internet.
Warning: Make sure you know what you are doing before trying these code.
*#0000#
Displays firmware version and date, Phone Model and Operator Variant
*#06#
Displays International Mobile Equipment Identity (IMEI Number).
*#7780#
Soft Reset: Restore factory settings.
*#7370#
Deep Reset: Removes everything and puts the phone right back to factory settings.
*#73#
Reset phone timers and game scores.
*3370#
Activates Enhanced Full Rate Codec (EFR). Phone uses the best sound quality but talk time is reduced by approx. 5%
#3370#
Deactivate Enhanced Full Rate Codec (EFR).
*#4720#
Activate Half Rate Codec - Phone uses a lower quality sound but you should gain approx 30% more Talk Time.
*#4720#
Deactivate the Half Rate Codec.
*#7760#
Dispalys Manufactures code.
#pw+1234567890+1#
Provider Lock Status.
#pw+1234567890+2#
Network Lock Status.
#pw+1234567890+3#
Country Lock Status.
#pw+1234567890+4#
SIM Card Lock Status.
*#2640#
Displays phone security code in use.
*#30#Lets you see the private number(????).
*#746025625#
Displays the SIM clock status.
*#67705646#
Phone code that removes operator logo on 3310 & 3330.
*#43#
Allows you to check the "Call Waiting" status of your cell phone
*#61#
Allows you to check the number that "On No Reply" calls are diverted to.
*#62#
Allows you to check the number that "Divert If Unreachable (no service)" calls are diverted to.
*#67#
Allows you to check the number that "On Busy Calls" are diverted to.
*#92702689#
Takes you to a secret menu where you may find some of the following informations: Displays Serial Number, Date Made, Purchase Date, Date of last repair, Transfer User Data. To exit this mode switch your phone off then on again.
*#94870345123456789#
Deactivate the PWM-Mem.
**21*number#
Turn on "All Calls" diverting to the phone number entered.
**61*number#
Turn on "No Reply" diverting to the phone number entered .
**67*number#
Turn on "On Busy" diverting to the phone number entered .
*#2820#
Bluetooth device address.
*#62209526#
Display the MAC address of the WLAN adapter.
12345
This is the default security code.
*#7328748263373738#
Resets security code
NOTE: Some of these codes maybe not work.