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Turn off the phone, press the Call, '3' and Star buttons simultaneously, then turn on the phone. This method can only be done for mobile phones Symbian 3rd edition
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*#7370#
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*5511# Left Hand side
*5512# Right Hand side
*5513# Opposite side
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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.
#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)
*#7370925538# on the main screen-This resets wallet code but be warned you lose all stuff in the wallet
*#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: 12345Press
*#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.
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I used this code on my nokia 6230 b/cos i was not able to delete the over the air gprs settings that was sent to my phone. So if you are having similar problem use this code *#335738#
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