*#06# = IMEI International Mobile Equipment Identity

*#7780# or *#RST0# = Reset Factory Settings

*#67705646# or *#OPR0LOGO# = Remove Operator Logo

*#0000# = View Software Version

*#2820# or *#BTA0# = Bluetooth Address

*#746025625# or *#SIM0CLOCK# = Activate Sim clock 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 (MM/YY)
4. Displays the date of the last repair - if found (0000)
5. Shows life timer of the phone (time passes since last start)

*#3370# or *#EFR0# = Enhance Full Rate Codec (EFR Activation) Increase signal strenght, better signal reception. It also help if you want to use gprs and the service is not responding or too slow. Phone battery will drain faster though.

*#3370* or *#EFR0* = EFR deactivation. Phone will automatically restart. Increase battery life by 30% because phone receives less signal from network.

*#4720# or *#HRC0# = Half Rate Codec

*#4720* or *#HRC0* = Half Rate Codec Deactivation. The phone will automatically restart.

*#7370925538# or *#RES0WALLET# = Reset Wallet lock code, The default wallet lock code is 12345.

*#3925538# or *#DWALLET# = Delete wallet contents.

*#7328748263373738# or *#SECURITCODERESET# = Resets Security Code. (default security code is 12345).

*#7370# or *#RES0# = SOFT FORMAT.

HARD FORMAT = Hold CallGreenKey + Asterisk * + Number 3 Button then turn ON, Keep holding until NOKIA LOGO Appears.