INFOTECHNO

*#06# IMEI code
*#9998*4357# Help Menu
*#9998*5282# Java menu (GRPS/CSD settings for JAVA server)
*#9999#0# Monitor    
Mode                                                                              
*#9999# or *#9998*9999# Software Version
*#8888# or *#9998*8888# Hardware Version
*#9998*746# or *#9998*0746# or *#0746# Sim Infos
*#9998*523# or *#9998*0523# or *#0523# Display Contrast
*#9998*842# or *#9998*0842# or *#0842# Vibration On
*#9998*289# or *#9998*0289# or *#0289# Buzzer On
*#9998*288# or *#9998*0288# or *#0288# Battery & Field Infos
*#9998*377# or *#9998*0377# Error log
*#9998*778# or *#9998*0778# or *#0778# Sim Service table
*#9998*782# show date and alarm clock
*#8999*638# show network information
*#9998*5646# change operator logo at startup
*#9998*76# production number
*#9998*968# view melody for alarm
*#9998*585# Non-Volatile Memory (NVM)
*#3243948# Digital Audio Interference Off
*#32436837# Digital Audio Interference On

Samsung T100 secret codes

*#06# IMEI code
*#9999# -> Show Software Version
*#0001# -> Show Serial Parameters
*2767*3855# -> Full EEPROM Reset ( THIS CODE REMOVES SP-LOCK!!!! but also change IMEI to 447967-89-400044-0, you must use CHGIMEI to restore it)
*2767*2878# -> Custom EEEPROM Reset
*#8999*228# -> Battery status (capacity, voltage, temperature)
*#8999*246# -> Program status
*#8999*289# -> Change Alarm Buzzer Frequency
*#8999*324# -> Debug screens

Infotechno

*#8999*364# -> Watchdog
*#8999*377# -> EEPROM Error Stack
*#8999*427# -> Trace Watchdog
*#8999*523# -> Change LCD contrast
*#8999*544# -> Jig detect
*#8999*636# -> Memory status
*#8999*746# -> SIM File Size
*#8999*778# -> SIM Service Table
*#8999*785# -> RTK (Run Time Kernel) errors
*#8999*786# -> Run, Last UP, Last DOWN
*#8999*837# -> Software Version
*#8999*842# -> Test Vibrator
*#8999*862# -> Vocoder Reg
*#8999*872# -> Diag
*#8999*947# -> Reset On Fatal Error
*#8999*999# -> Last/Chk
*#8999*9266# -> Yann debug screen (=Debug Screens?)
*#8999*9999# -> Software version

Samsung T200 codes

#9324# Netmon (press the hangup key to exit)
#9998*JAVA# Edit GPRS/ CSD settings (S100 Only)
*#9998*Help# Help screen/ List of codes
*#9998*LOGO# Change operator Logo
*#9998*RTC# RTC Display
*#9998*Bat# Battery Status
*#9998*Buz# Turns Buzzer ON
*#9998*Vib# Turns Vibrator ON
*#9998*LCD# LCD Contrast
*#9998*9999# Softwre Version
*#9998*8888# Hardware Version
*#9998*377# NVM Error Log (?????)
*#9998*NET# SIM Network ID

Infotechno

*#9998*778# SIM Serv. Table
*#9998*SIM# SIM Info
*#9998*PN# Production No.
*#9998*968# Reminder Tune
*#9998*NVM# Displays Non-Volitile Memory Status
*#9999*C# ???????????????????
*#06# Displays phones I**I No.
***/// ***/// NOTE /// *** RED COLOR , they appear serious !!! Use at own risk !!!
*#9998*2576# Forces SIM Error
*#9998*DEAD# Forces Phone Crash
*2767*MEDIA# Resets the medis on the phone (deletes all downloaded pics/tones)
*2767*FULL# Resets the EEPRON *DANGEROUS*
*2767*CUST# Resets the Custom EEPRON
*2767*JAVA# Resets JAV downloads (deletes all downloaded midlits)
*2767*STACKRESET# Resets Stack
*2767*225RESET# ????????????????? * Dangerous *
*2767*WAP# Resets WAP Setting & Deletes Favorites

For all Samsung mobiles ! some codes are not applicable for all samsung mobile

ENJOY..............................................