Here we provide some basic codes for samsung users which help you a lot.
- *#9998*4357# Help Menu
- *#9998*5282# Java menu (GRPS/CSD settings for JAVA server)
- *#9998*523# or *#9998*0523# or *#0523# Display Contrast
- *#8888# or *#9998*8888# Hardware Version
- *#9999# or *#9998*9999# check Software Version
- *#8888# or *#9998*8888# Hardware Version
- *#9998*782# show date and alarm clock
- *#8999*638# show network information
- *#32436837# Digital Audio Interference On
- *#9998*585# Non-Volatile Memory (NVM
- *#9998*778# or *#9998*0778# or *#0778# Sim Service table
- *#9998*5646# change operator logo at startup
- *#9998*76# production number
- *#9998*746# or *#9998*0746# or *#0746# Sim Information
- *#9998*288# or *#9998*0288# or *#0288# Battery & Field Infos
Enjoy & share your mind if you know more: 
