[M@sTeR-MinD]

*#06# : Show IMEI
*#9999# : Show Software Version
*#0837# : Show Software Version (instructions)
*#0001# : Show Serial Parameters
*#9125# : Activates the smiley when charging.

*#9998*228# : Battery status (capacity, voltage, temperature)
*#9998*246# : Program status
*#9998*289# : Change Alarm Buzzer Frequency
*#9998*324# : Debug screens
*#9998*364# : Watch***
*#9998*377# : EEPROM Error Stack - Use side keys to select values. Cancel and ok.
*#9998*427# : Trace Watch***
*#9998*523# : Change LCD contrast - Only with version G60RL01W
*#9998*544# : Jig detect
*#9998*636# : Memory status
*#9998*746# : SIM File Size
*#9998*778# : SIM Service Table
*#9998*785# : RTK (Run Time Kernel) errors - if ok then phn is reset, info is put in memory error.
*#9998*786# : Run, Last UP, Last DOWN
*#9998*837# : Software Version
*#9998*842# : Test Vibrator - Flash the screenligth during 10 seconds and vibration activated.
*#9998*862# : Vocoder Reg - Normal, Earphone or carkit can be selected
*#9998*872# : Diag
*#9998*947# : Reset On Fatal Error
*#9998*999# : Last/Chk

*#9998*9266# : Yann debug screen (=Debug Screens?)
*#9998*9999# : Software version

If the up Codes doesn't work, you should change *#9998* to *#0. i.e. *#9998*523# change to *#0523#. An other thing that will help is to remove your SIM card. *0001*s*f*t# : Changes serial parameters (s=?, f=0,1, t=0,1) (incomplete)
*0002*?# : unknown
*0003*?# : unknown

SP-unlock SGH-600 (and also SGH-Sgh-600)
*2767*3855# : Full EEPROM Reset ( THIS CODE REMOVES SP-LOCK!! )
But also changes IMEI to 447967-89-400044-0. (Doing this is illegal)

*2767*2878# : Custom EEEPROM Reset
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