Useful Nokia Mobile Secret Codes

Nokia 31xx
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Firmware version
*#0000# or *#3110#
IMEI Code
*# 06 #
Restores Factory Settings
*#7780#
Warranty Codes
*#92702689# (= *#war0anty#)

Just scroll down through the information. If entering the above code requires a
further warranty code try entering the following:

6232 (OK) : Month and year of manufacture
7332 (OK) : Last repair date
7832 (OK) : Purchase date (if previously set)
9268 (OK) : Serial number
37832 (OK) : Set purchase date (this can only be done once)
87267 (OK) : Confirm transfer

Nokia 5110
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IMEI Number *#06#
For checking the IMEI (International Mobile Equipment Identity).
———————————————————
Security Code 12345
Default security code is 12345. If you forgot your security code, there s so many program on the net which allowed you to know the security code likes Security ID Generator, Nokia IMEI Changer, etc.

update:
Security ID Generator (SID.EXE) and IMEI Generator (NOKIAIMEI.EXE) doesn t works with Nokia 5110
Resetting Security Code

If you accidentally lock the phone or forgot the security code, the best thing to do is check it with your local Nokia dealer. For advanced user, you can use WinTesla, PCLocals or LogoManager program to read the security code or resetting the code (You will need an FBUS/MBUS (or compatible) cable to do this.