*#06# -IMEI get the serial number & generate it here incase you forgot your security code: http://nfader.z-host.ru
*#7780# - restore factory settings
*#67705646# -clear LCD
*#0000# -view handset
*#2820# -bluetooth device address
*#746025625# -sim clock status
*#62209526# -display MAC address of the WLAN adapter (N80)
#pw+1234567890+1# -show sim restrictions
*#92702689# -secret menu
*#3370# -activate EFR(Enhance Fullrate Codec) this consumes 50% of battery & enhances phone signal..
*#3370* -deactivate EFR
*#4720# -activate halfrate EFR
*#4720* -deactivate halfrate EFR
*#7370925538# -reset wallet, default code is 12345 (s60)
*#3925538# -delete wallet contents
*#7328748263373738# -reset security code to default code 12345
*#7370# -format s60 only..
*3501# -refresh to recive messages
Unlock service provider: insert sim, turn phone on & press volume up(arrow key) for 3 seconds, should say pin code. Press 'C' (call) then '*' message should flash, press * again & 04*pin*pin*pin# for fun: change closed caller group ( SETTINGS>SECURITY SETTINGS>USER GROUPS ) to 00000 & your phone will sound the message tone, when you are near a radar speed trap, setting it to 500 will cause your phone to set off security alarms at shop exits, great for practical jokes.. Hehe..
-test it on your own risks.. This may vary on handsets & some codes may not work..
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