*#06# for checking the
IMEI (International Mobile
Equipment Identity).
*#7780# Resets factory settings (contents on phone memory will be lost)
*#92702689# Displays date of manufacture, date of purchase, date of repair, life timer of your phone, serial number, etc.
*#67705646# This will
clear the LCD display
(operator logo).
*#0000# To view
software version.
*#2820# Bluetooth
device address.
*#746025625# Sim clock
allowed status.
*#62209526# - Display
the MAC address of the
WLAN adapter. This is
available only in the
newer devices that
supports WLAN like N80
*#3370# - Enhanced Full
Rate Codec (EFR)
activation. Increase signal
strength, better signal
reception. It also help if u
want to use GPRS and the
service is not responding
or too slow. Phone
battery will drain faster
though.
*#3370* - (EFR)
deactivation. Phone will
automatically restart.
Increase battery life by
30% because phone
receives less signal from
network.
*#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#
Note, your data in the
wallet will be erased.
Phone will ask you the
lock code. Default lock
code is: 12345
*#732874826337378# Resets security code
Nokia 1600 & 2310 screen rotating tricks:
Dial
*#5511#
*#5512#
*#5513#
*#5514#