I do not take any responsibility of any damage to your Nokia cellphone as a result of applying any of these codes listed below. So please try these codes on your own risk.
Some of the given secret codes may not work on your cellphone depending on the Nokia cellphone model you are using.
Do not press "Call Button/Done" in order to execute the code. The code is automatically executed as you type in the whole code.
Nokia Secret Codes (Advanced) given below work on most Nokia Mobile Phones to Activate or Deactivate advanced hidden functions that are not accessible through the phone menu.
Codes List (5) for Symbian models:
On the main screen type in : (Make sure your mobile phone's keypad is not locked)
*efr0#
Enable EFR encoding (pre-2003 models).
#efr0#
Disable EFR encoding (pre-2003 models).
*hra0#
Enable HR encoding (pre-2003 models).
#hra0#
Disable HR encoding (pre-2003 models).
#pw+1234567890+n#
Display the SIM lock status: (pre-2003 models) where:
n = 1: provider lock
n = 2: network lock
n = 3: country lock
n = 4: SIM lock
n# n = 1..999: recall the number stored in the SIM location n (DCT3, DCT4, BB5 models)
Code List: 1 2 3 4 5