*#1234# = Firmware Version.
*#2222# = H/W Version.
*#8999*8376263# = All Versions Together.
*#8999*8378# = Test Menu.
*#4777*8665# = GPSR Tool.
*#8999*523# = LCD Brightness.
*#8999*377# = Error Menu.
*#8999*327# = EEP Menu.
*#8999*667# = Debug Mode.
*#92782# = PhoneModel. (Wap)
#*5737425# = JAVA Mode.
*#2255# = Call List.
*#232337# = Bluetooth MAC Adress.
*#5282837# = Java Version.
#*4773# = Incremental Redundancy.
#*7752# = 8 PSK uplink capability bit.
#*7785# = Reset wakeup & RTK timer cariables/variables.
#*7200# = Tone Generator Mute.
#*3888# = BLUETOOTH Test mode.
#*7828# = Task screen.
#*#8377466# = S/W Version & H/W Version.
#*2562# = Restarts Phone.
#*2565# = No Blocking? General Defense.
#*3353# = General Defense, Code Erased.
#*3837# = Phone Hangs on White screen.
#*3849# = Restarts Phone.
#*3851# = Restarts Phone.
#*3876# = Restarts Phone.
#*7222# = Operation Typ: (Class C GSM)
#*7224# = !!! ERROR !!!
#*7252# = Operation Typ: (Class B GPRS)
#*7271# = CMD: (Not Available)
#*7274# = CMD: (Not Available)
#*7337# = Restarts Phone. (Resets Wap Settings)
#*2787# = CRTP ON/OFF.
#*2886# = AutoAnswer ON/OFF.
#*3737# = L1 AFC.
#*5133# = L1 HO Data.
#*7288# = GPRS Detached/Attached.
#*7287# = GPRS Attached.
#*7666# = White Screen.
#*7693# = Sleep Deactivate/Activate.
#*7284# = L1 HO Data.
#*2256# = Calibration info? (For CMD set DEBUGAUTONOMY in cihard.opt)
#*2286# = Databattery.
#*2527# = GPRS switching set to (Class 4, 8, 9, 10)
#*2679# = Copycat feature Activa/Deactivate.
#*3940# = External looptest 9600 bps.
#*4263# = Handsfree mode Activate/Deactivate.
#*4700# = Please use function 2637.
#*7352# = BVMC Reg value (LOW_SWTOFF, NOMINAL_SWTOFF)
#*2558# = Time ON.
#*3370# = Same as 4700.
#*3941# = External looptest 115200 bps
#*5176# = L1 Sleep.
#*7462# = SIM Phase.
#*7983# = Voltage/Freq.
#*7986# = Voltage.
#*8466# = Old Time.
#*2255# = Call Failed.
#*5187# = L1C2G trace Activate/Deactivate.
#*5376# = DELETE ALL SMS!!!!.
#*6837# = Official Software Version: (0003000016000702)
#*7524# = KCGPRS: (FF FF FF FF FF FF FF FF 07)
#*7562# = LOCI GPRS: (FF FF FF FF FF FF FF FF FF FF FF FE FF 01)
#*2337# = Permanent Registration Beep.
#*2474# = Charging Duration.
#*2834# = Audio Path. (Handsfree)
#*3270# = DCS Support Activate/Deactivate.
#*3282# = Data Activate/Deactivate.
#*3476# = EGSM Activate/Deactivate.
#*3676# = FORMAT FLASH VOLUME!!!
#*4760# = GSM Activate/Deactivate.
#*4864# = White Screen.
#*6833# = New uplink establishment Activate/Deactivate.
#*3273# = EGPRS multislot. (Class 4, 8, 9, 10)
#*7722# = RLC bitmap compression Activate/Deactivate.
#*2351# = Blinks 1347E201 in RED.
#*4472# = Hysteresis of serving cell: 3 dB
#*2775# = Switch to 2 inner speaker.
#*9270# = Force WBS.
#*7878# = FirstStartup. (0=NO, 1=YES)
#*3757# = DSL UART speed set to. (LOW, HIGH)
#*3838# = Blinks 3D030300 in RED.
#*7878# = FirstStartup. (0=NO, 1=YES)
#*3838# = Blinks 3D030300 in RED.
*2767*226372# = Camera Reset. (deletes photos)
#7263867# = RAM Dump. (On or Off)

samsung mobile code. – - – sound code.
Samsung phones.
Dial *#6984125*#
Test menu dial *#9072641*# (You need this one i think.)
Click 5 Audio – 2 AP volume config

Tune Headset volume:
*#9072641*# – 2 EAR config – 3 Ringtone volume – Stap 6 tune it to 10
Tune movie volume:
*#9072641*# – 3 SPK config – 3 Ringtone volume – Stap 6 tune it to 10

Note it works but don’t forget to type somewhere your old settings.

Credit:
Samfirmware and its team
Angelom and its creditors