Samsung secret Codes

The master reset code is:
  #*7728#
  It will not delete anything from your mobile phone, but set eveything to its default setting as it was on the time of purchase.

For Reset Java midlets or other media,
  *2767*JAVA# Java Reset and (Deletes all Java Midlets)
  *2767*MEDIA# Reset Media (Deletes All Sounds and Pics)
  *2767*WAP# Wap Reset
  *2767*CUST# Reset Custom EEPR0M
  *2767*FULL# Reset Full EEPR0M (Caution)  
To unlock your phone put a sim from another company

              Type *#9998*3323# it will reset your phone. Push exit and then push 7, it will reset again. Put your other sim in and it will say sim lock,type in 00000000 then it should be unlocked. Type in *0141# then the green call button and it's unlocked to all networks. This code may not work on the older phones and some of the newer phones. If it doesn't work you will have to reset your phone without a sim in it by typing *#2767*2878# or *#9998*3855# (not tested).

Other Samsung secret Codes :
 Software version: *#9999#
 IMEI number: *#06#
 Serial number: *#0001#
 Battery status- Memory capacity : *#9998*246#
 Debug screen: *#9998*324# - *#8999*324#
 LCD kontrast: *#9998*523#
 Vibration test: *#9998*842# - *#8999*842#
 Alarm beeper - Ringtone test : *#9998*289# - *#8999*289#
 Smiley: *#9125#
 Software version: *#0837#
 Display contrast: *#0523# - *#8999*523#
 Battery info: *#0228# or *#8999*228#
 Display storage capacity: *#8999*636#
 Display SIM card information: *#8999*778#
 Show date and alarm clock: *#8999*782#
 The display during warning: *#8999*786#
 Samsung hardware version: *#8999*837#
 Show network information: *#8999*638#
 Display received channel number and received intensity:   *#8999*9266#