I will update this thread when I have more codes.
Remember there are no guarantees or warranties. If you don't know what you are doing - don't do it.

*#06# -> Displays imei
*#0000# -> shows software version
*#746025625# -> Shows if your phone supports sim clock stopping
*#92702689# -> Displays various info,repair date,purchase date etc
*3370# -> Activates enhanced full rate
#3370# -> Deactivates enhanced full rate
*4370# -> Activates enhanced half rate
#4370# -> Deactivates enhanced half rate
xx# -> Position in phone (where x is 1-9)
*#2820# -> Blue tooth information/address
*#7220# -> Enables gprs pccch
*#3925538# -> Deletes wallet (6310,6310i tested)
*#67705646# -> Clears operator logo on some versions of 3310 & 3330
*#pw+xxxxxxxxxx+x# -> Sim losk status (where x is the master unlock code
*#7370# Software reset (7650)

Ukim

› See More: Nokia Codes