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Type the folling codes in NOKIA main screen.
1) *#06# for checking the IMEI. (International Mobile
Equipment Identity).


 2) *#7780# reset to factory settings.
3) *#67705646# This will wash  the LCD display
(operator logo).
4) *#0000# To view software version.
5) *#2820# Bluetooth device address.
6) *#746025625# Sim clock allowed status.
7) *#62209526# - Display the MAC address of the
WLAN adapter.8)  #pw+1234567890+1# Shows if sim have restrictions.
9) *#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)
10) *#3370# - Enhanced Full Rate Codec (EFR)
activation. Increase signal strength, better signal
reception. It also help if u want to use GPRS.
11) *#3370* - (EFR) deactivation. Phone will
automatically restart. Increase battery life by 30%
because phone receives less signal from network.
12) *#4720# - Half Rate Codec activation.
13) *#4720* - Half Rate Codec deactivation.Then the phone will restart.
14) wallet code for Nokia S60 phone, use this code to reset: *#7370925538#.
15)*#3925538#  delete the contents and code of wallet.
16) *#7328748263373738# resets security code.