Samsung cell phone secret codes

Samsung cell phons have good appearances and good build quality, hence it’s very popular. Below are some secret codes for your Samsung cell phone.
IMEI code: *#06#
Help Menu: *#9998*4357#
Java menu (GRPS/CSD settings for JAVA server): *#9998*5282#
Monitor Mode: *#9999#0#
Software Version: *#9999# or *#9998*9999#
Hardware Version: *#8888# or *#9998*8888#
Sim Infos: *#9998*746# or *#9998*0746# or *#0746#
Display Contrast: *#9998*523# or *#9998*0523# or *#0523#
Vibration On (until you push OK): *#9998*842# or *#9998*0842# or *#0842#
Buzzer On (until you push OK): *#9998*289# or *#9998*0289# or *#0289#
Battery & Field Infos: *#9998*288# or *#9998*0288# or *#0288#
Error log: *#9998*377# or *#9998*0377#
Sim Service table: *#9998*778# or *#9998*0778# or *#0778#
Show date and alarm clock: *#9998*782#
Show network information: *#8999*638#
Change operator logo at startup: *#9998*5646#
Production number: *#9998*76#
View melody for alarm: *#9998*968#
Non-Volatile Memory (NVM): *#9998*585#
Digital Audio Interference Off: *#3243948#
Digital Audio Interference On: *#32436837#