Below are the secret code for Nokia Phones:
When you are on the main screen type in:
*#0000# To view software version.
*#06# for checking the IMEI (International Mobile Equipment Identity).
*#67705646# This will clear the LCD display(operator logo).
*#746025625# Sim clock allowed status.
*#2820# Bluetooth device address.
*#7780# reset to factory settings.
#pw+1234567890+1# Shows if sim have restrictions.
*#92702689# - takes you to [...]