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

*#4720#
With this Nokia code you can deactivate the Half Rate Codec

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

*#9999#
Phones software version if *#0000# does not work

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

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

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

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

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

*#147#
This lets you know who called you last (Only vodofone)

*#1471#
Last call (Only vodofone)

*#21#
This phone code allows you to check the number that "All Calls" are diverted to

*#2640#
Displays phone security code in use

*#30#
Lets you see the private number

*#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

*#67705646#
Phone code that removes operator logo on 3310 & 3330

*#73#
Reset phone timers and game scores

*#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

*#7760#
Manufactures code

*#7780#
Restore factory settings

*#8110#
Software version for the nokia 8110

*#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

*#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


IMEI number: * # 0 6 #

Software version: * # 9 9 9 9 # or * # 0 8 3 7 #

Net Monitor: * # 0 3 2 4 #

Memory reset (removes SIMLOCK!!!): *2767*3855# (works only on older versions)

Memory reset CUSTOM: *2767*2878# (works only on older versions)

Change dispplay contrast: * # 0 5 2 3 #

Memory info: * # 0 3 7 7 # or * # 0 2 4 6 #

Battery status: * # 9 9 9 8 * 2 2 8 #

Change sound of alarm: *#9998*289#

Vibra test: *#9998*842#
*#0001# -> Show Serial Parameters

*2767*3855# -> Full EEPROM Reset ( THIS CODE REMOVES SP-LOCK!!!! but also
change IMEI to 447967-89-400044-0, you must use CHGIMEI to
restore it)
*2767*2878# -> Custom EEEPROM Reset

*#9998*228# -> Battery status (capacity, voltage, temperature)
*#9998*246# -> Program status
*#9998*289# -> Change Alarm Buzzer Frequency
*#9998*324# -> Debug screens
*#9998*364# -> Watchdog
*#9998*377# -> EEPROM Error Stack
*#9998*427# -> Trace Watchdog
*#9998*523# -> Change LCD contrast
*#9998*544# -> Jig detect
*#9998*636# -> Memory status
*#9998*746# -> SIM File Size
*#9998*778# -> SIM Service Table
*#9998*785# -> RTK (Run Time Kernel) errors
*#9998*786# -> Run, Last UP, Last DOWN
*#9998*837# -> Software Version
*#9998*842# -> Test Vibrator
*#9998*862# -> Vocoder Reg
*#9998*872# -> Diag
*#9998*947# -> Reset On Fatal Error
*#9998*999# -> Last/Chk

*#9998*9266# -> Yann debug screen (=Debug Screens?)
*#9998*9999# -> Software version

*0001*s*f*t# -> Changes serial parameters (s=?, f=0,1, t=0,1) (incomplete)
*0002*?# -> unknown
*0003*?# -> unknown

با تشکر