Press the ff keys on your nokia cellphones.
*06 - To get ur phone's IMEI.

*7780 - Reset to factory default setting.

*67705646 - To clear your Op logo.

*0000 - Software version.

*2820 - Your blutooth address.

*746025625 - Sim clock enable.

*92702689 - Secret menu.

pw+1234567890+1 - Show sim restriction.

*3370 - Enhanced signal 4 better GPRS connetion, though it wil drain your battery faster.

*3370* - Long drain battery but it wil affect your signal rate.

*4720 - Half rate codec.

For more codes and info just mail me...