NOKIA - secret codes

Though this has been part of forwards, providing here to help, when in need. :-)
*#06# - for checking the IMEI (International Mobile Equipment Identity).
*#0000# - To view software version.
*#92702689# - gives you the information below:
1. Displays Serial Number.
2. Displays the Month and Year of Manufacture
3. Displays the date where the phone was purchased
4. Displays the date of the last repair - if found
5. Shows life timer of phone (time passes since last start)
*#7780# - reset to factory settings.
*#67705646# - This will clear the LCD display(operator logo).
*#2820# - Bluetooth device address.
*#746025625# - Sim clock allowed status.
#pw+1234567890+1# - Provider Lock
#pw+1234567890+2# - Network Lock
#pw+1234567890+3# - Country Lock
#pw+1234567890+4# - SIM Lock
*#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.