Samsung E720, E730, D500 Secret Codes

*#1111#
S/W Version

*#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)

#*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

#*5171#
L1P1

#*5172#
L1P2

#*5173#
L1P3

#*7326#
Accessory

#*7683#
Sleep variable

#*8465#
Time in L1

#*2252#
Current CAL

#*2836#
AVDDSS Management Activate/Deactivate

#*3877#
Dump of SPY trace

#*7728#
RSAV

#*2677#
Same as 4700

#*3797#
Blinks 3D030300 in RED

#*3728#
Time 2 Decod

#*3725#
B4 last off

#*7372#
Resetting the time to DPB variables

#*7732#
Packet flow context bit Activate/Deactivate

#*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)

#*8726#
Switches USBACM to Normal

#*8724#
Switches USBACM to Generator mode

#*8727#
Switches USBACM to Slink mode

#*8725#
Switches USBACM to Loop-back mode

#*3838#
Blinks 3D030300 in RED

#*2077#
GPRS Switch

#*22671#
AMR REC START

#*22672#
top AMR REC (File name: /a/multimedia/sounds/voice list/ENGMODE.amr)

#*22673#
Pause REC

#*22674#
Resume REC

#*22675#
AMR Playback

#*22676#
AMR Stop Play

#*22677#
Pause Play

#*22678#
Resume Play

#*77261#
PCM Rec Req

#*77262#
Stop PCM Rec

#*77263#
PCM Playback

#*77264# PCM Stop Play

#*2872# CNT

*#8999*283# ???

#*22679#
AMR Get Time

*#8999*364#
Watchdog ON/OFF

*2767*3855#
E2P Full Reset

*2767*2878#
E2P Custom Reset

*2767*927#
E2P Wap Reset

*2767*226372#
E2P Camera Reset

*2767*688#
Reset Mobile TV

#7263867#
RAM Dump (On or Off)

*#7465625#
Check the locks

*7465625*638*Code#
Enables Network lock

#7465625*638*Code#
Disables Network lock

*7465625*782*Code#
Enables Subset lock

#7465625*782*Code#
Disables Subset lock

*7465625*77*Code#
Enables SP lock

#7465625*77*Code#
Disables SP lock

*7465625*27*Code#
Enables CP lock

#7465625*27*Code#
Disables CP lock

*7465625*746*Code#
Enables SIM lock

#7465625*746*Code#
Disables SIM lock

*7465625*228#
Activa lock ON

#7465625*228#
Activa lock OFF

*7465625*28638#
Auto Network lock ON

#7465625*28638#
Auto Network lock OFF

*7465625*28782#
Auto subset lock ON

#7465625*28782#
Auto subset lock OFF

*7465625*2877#
Auto SP lock ON

#7465625*2877#
Auto SP lock OFF

*7465625*2827#
Auto CP lock ON

#7465625*2827#
Auto CP lock OFF

*7465625*28746#
Auto SIM lock ON

#7465625*28746#
Auto SIM lock OFF

#8999*228# or *#9998*228#
will show you how much charge the battery has in %. It even
gives the temperature.

source : samsung-secret-codes.blogspot.com