This is some key codes that work on the N73 (and maybe most S60v3 phones)

1. *#2820# - Bluetooth device address
2. *#0000# - Firmware version info
3. *#06# - Serial number (IMEI)

If you press & hold Applications key, a minimal task manager will pop-up just like pressing Alt+Tab in Windows. You can scroll through the currently running applications list using the joystick or the Applications key itself, select to switch to the highlighted application or hit C to kill the highlighted application.

The Call key can be used to quickly share objects such as pictures, files, etc. Try this trick in File Manager, Gallery and etc.

These Nokia codes will work on most Nokia Mobile Phones

(1) *3370# Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%

(2) #3370# Deactivate Enhanced Full Rate Codec (EFR) OR *3370# ( F avourite )

(3) *#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time.

(4) *#4720# Deactivate Half Rate Codec.

(5) *#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type. ( Favourite )

(6) *#9999# Phones software version if *#0000# does not work.

(7) *#06# For checking the International Mobile Equipment Identity (IMEI Number). ( Favourite )

(Cool #pw+1234567890+ 1# Provider Lock Status. (use the "*" button to obtain the "p,w"
and "+" symbols).

(9) #pw+1234567890+ 2# Network Lock Status. (use the "*" button to obtain the "p,w"
and "+" symbols).

(10) #pw+1234567890+ 3# Country Lock Status. (use the "*" button to obtain the "p,w"
and "+" symbols).

(11) #pw+1234567890+ 4# SIM Card Lock Status. (use the "*" button to obtain the "p,w"
and "+" symbols).

(12) *#147# (vodafone) this lets you know who called you last.

(13) *#1471# Last call (Only vodofone).

(14) *#21# Allows you to check the number that "All Calls" are diverted to

(15) *#2640# Displays security code in use.

(16) *#30# Lets you see the private number.

(17) *#43# Allows you to check the "Call Waiting" status of your phone.

(1 *#61# Allows you to check the number that "On No Reply" calls are diverted to.

(19) *#62# Allows you to check the number that "Divert If Unreachable (no service)" calls
are diverted to.

(20) *#67# Allows you to check the number that "On Busy Calls" are diverted to.

(21) *#67705646# Removes operator logo on 3310 & 3330.

(22) *#73# Reset phone timers and game scores.

(23) *#746025625# Displays the SIM Clock status, if your phone supports this power saving feature "SIM Clock Stop Allowed", it means you will get the best standby time possible.

(25) *#7780# Restore factory settings.

(26) *#8110# Software version for the nokia 8110.

(27) *#92702689# Displays - 1.Serial Number, 2.Date Made, 3.Purchase Date, 4.Date of last repair (0000 for no repairs), 5.Transfer User Data. To exit this mode you need to switch your phone off then on again. ( Favourite )

(2 *#94870345123456789 # Deactivate the PWM-Mem.

(29) **21*number# Turn on "All Calls" diverting to the phone number entered.

(30) **61*number# Turn on "No Reply" diverting to the phone number entered.

(31) **67*number# Turn on "On Busy" diverting to the phone number entered.

(32) 12345 This is the default security code.

press and hold # Lets you switch between lines

Wow, a lot of codes... do you really use this?
Anyway, thanks for the info

Ur Welcome,bro...
I tried some of the codes n its worked...
Hopefully it useful for other members..