On the main screen type
*#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.
*#62209526# - Display the MAC address of the WLAN
adapter. This is available only in the newer devices that
support WLAN
#pw+1234567890+1# Shows if sim have restrictions.
*#92702689# - takes you to a secret menu where you
may find some of the information below:
1. Displays Serial Number.
2. Displays the Month and Year of Manufacture
3. Displays (if there) the date where the phone was
purchased (MMYY)
4. Displays the date of the last repair - if found (0000)
5. Shows life timer of phone (time passes since last start)
*#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
Press *#3925538# to delete the contents and code of
wallet.
Unlock service provider: Insert sim, turn phone on and
press vol up(arrow keys) for 3 seconds, should say pin
code. Press C,then press * message should flash, press *
again and 04*pin*pin*pin#
*#7328748263373738# resets security code.
Default security code is 12345
Very Useful Secret Codes for the Nokia mobiles,I would suggest the Unlock code for Unlock the Nokia mobiles from the Network lock,I unlocked my Nokia N97 model mobile using the Unlock code in the site http://www.superunlockcodes.com/nokia-n97/rs12wp9/ at low cost,i unlocked the Nokia N97 from UNITED KINGDOM(UK) T-MOBILE Network....