NOKIA MOBILE *#06# Display IMEI number.
*#0000# Display firmware version.
*#7370# Restore the phone to factory default settings. ...
*#7780# Soft reformat the phone. ...
*#92702689# Shows the Life timer on my N73 and N95 8GB, whatever that means. ...
*#2820# Show Bluetooth MAC address.
Common Secret Codes for Android Phones##4636## - View phone information.
##7780## - Reset to factory settings.
*#21# - Displays IMEI number.
##7594## - Change Ringer mode.
##34971539## - Camera information.
##232331## - Wireless LAN tests.
##2663## - Touchscreen calibration.
##0283## - Packet loopback test.