Nokia secret code

On the main screen type in:
*#06# for checking the IMEI (International Mobile Equipment Identity).
*#7780# reset to factory settings.
*#67705646# This will clear the LCD display(operator logo).
*#0000# To view software version.
*#2820# Bluetooth device address.
*#746025625# Sim clock allowed status.
#pw+1234567890+1# Shows if sim have restrictions.
*#92702689# - takes you to a secret menu where you may find some

*#4720# - Half Rate Codec activation.
*#4720* - Half Rate Codec deactivation. The phone will automatically restart
If you forgot wallet code for Nokia S60 phone, use this code reset: *#7370925538#
*#7328748263373738# resets security code.

*#21# Allows you to check the number that "All Calls" are diverted to
*#2640# Displays security code in use.
*#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.