*#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.
#pw+1234567890+1# Shows if sim have restrictions.
*#92702689# :Displays a secret menu to display Serial Number, display
the Month and Year of Manufacture, display (if there) the date where
the phone was purchased, display the date of the last repair - if found
(0000) and show life timer of phone
*#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#
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 for Nokia phones is 12345
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