Here's a list of hidden codes that will do things on your Nokia mobile phone that you cannot access through the menus. I knew some of these already, but the extent of this list is massive. And remember, some changes might not be right for you, so be sure to keep this list bookmarked just in case you wish to change something back! Not all of the codes will work on all Nokia phones, but most of them are universal. Here goes:
*3370# Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my 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 #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)
12345 This is the default security code
*#21# Allows you to check the number that “All Calls” are diverted to
*#30# Lets you see the private number
*#43# Allows you to check the “Call Waiting” status of your 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
*#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)
*#67705646# 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
*#94870345123456789# Deactivate the PWM-Mem
press and hold # Lets you switch between lines
*#7760# Manufacturers 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
**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
Have fun playing about with these codes! Remember, if you get some horrible settings that you wish to revert, just type *#7780# in order to restore your phone to its factory settings.
