Nokia mobile secret codes..

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)
95 Copyright ©2009 Leo Impact Security Services Pvt Ltd
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.