*#06# IMEI number 
*#1111# S/W version 
*#1234# Firmware version 
*#2222# H/W version 
*#232337# Bluetooth address 
*#7465625# Lock status 
*#92782# Wap name (changeable) (but keep a note of the original Wap name)
*#8999*8378# Test Menu 
*#4777*8665# GPSR,EDGE Menu (you can activate EGPRS) 
*#8999*377# Error Menu (error logs) 
*#8999*327# EEP Menu 
*#8999*667# Debug Menu 
*2767*3855# Reset memory ("SIMLOCK removing") 
*2767*2878# "Reset CUSTOM memory" 

*2767*688# = Unlocking Code
*#8999*8378# = All in one Code
*#4777*8665# = GPSR Tool
*#8999*523# = LCD Brightness
*#8999*3825523# = External Display
*#8999*377# = Errors

#*5737425# = JAVA Something{I choose 2 and it chrashed}]
*#2255# = Call List
#*7222# = Operation Typ (Class C GSM)
#*7224# = I Got !! ERROR !!
#*7252# = Oparation Typ (Class B GPRS)
#*7271# = Multi Slot (Class 1 GPRS)
#*7274# = Multi Slot (Class 4 GPRS)
#*7276# = Dunno

#*7337# = EEPROM Reset (Unlock and Resets Wap Settings)
#*2787# = CRTP ON/OFF
#*3737# = L1 Dbg data
#*5133# = L1 Dbg data
#*7288# = GPRS Attached
#*7287# = GPRS Detached
#*7666# = SrCell Data
#*7693# = Sleep Act/DeAct (Enable or Disable the Black screen after doing nothing for a while)
#*7284# = Class : B,C or GPRS
#*2256# = Calibration Info
#*2286# = Battery Data
#*2527# = GPRS Switching (set to: class 4, class 8, class 9 or class 10)
#*2679# = Copycat feature (Activate or Deactivate)
#*3940# = External loop test 9600 bps
#*4263# = Handsfree mode (Activate or Deactivate)
#*4700# = Half Rate (Activate or Deactivate)
#*7352# = BVMC Reg value
#*8462# = Sleeptime
#*2558# = Time ON
#*3370# = EFR (Activate or Deactivate)
#*3941# = External looptest 115200 bps
#*5176# = L1 Sleep
#*7462# = SIM phase
#*7983# = Voltage/Frequenci (Activate or Deactivate)
#*7986# = Voltage (Activate or Deactivate)
#*8466# = Old time
#*2255# = Call ???
#*5187# = L1C2G trace (Activate or Deactivate)
#*5376# = ??? White for 15 secs than restarts.
#*6837# = Official Software Version
#*7524# = KCGPRS
#*7562# = LOCI GPRS
#*7638# = RLC allways open ended TBF (Activate or Deactivate)
#*7632# = Sleep mode Debug
#*7673# = Sleep mode RESET
#*2337# = Permanent Registration Beep
#*2474# = ???
#*2834# = Audio Path
#*3270# = DCS support (Activate or Deactivate)
#*3282# = Data (Activate or Deactivate)
#*3476# = EGSM (Activate or Deactivate)
#*3676# = Flash volume formated
#*4760# = GSM (Activate or Deactivate)
#*4864# = Dunno doesn't work on newer versions
#*5171# = L1P1
#*5172# = L1P2
#*5173# = L1P3
#*7326# = Accessory (I got Vibrator)
#*7683# = Sleep variable (Cool
#*7762# = SMS Brearer CS (Activate or Deactivate)
#*8465# = Time in L1
#*9795# = wtls key
#*2252# = Current CAL
#*2836# = AVDDSS Management (Activate or Deactivate)
#*3877# = Dump of SPY trace
#*7728# = RSAV done# (Everything went to standart but nothing was deleted)
#*2677# = ARM State (None or Full Rate)

*#8999*636# = Have no clue what it is, i see 20 lines
*#9999# = Software version
*#8999*8376263# = HW ver, SW ver and Build Date
*#8888# = HW version
*#8377466# = Same HW/SW version thing

Most of them are tested, but not all. Use them for your own risk.