samsung secret codes

*2767*3855#
factory format. It'll remove all files and settings including the internal memory storage. It'll also reinstall the phone firmware.
PS: Once you give this code, there is no way to cancel the operation unless you remove the battery from the phone. So think twice before giving this code.
*#197328640#
enter into Service mode. You can run various tests and change settings in the service mode.
*#0228#
This code can be used to get detailed information about phone battery.
*#7465625#
This code can be used to check the status of Sim Lock and Network Lock.
Codes to get Firmware version information:
*#4986*2650468# - SW Version, HW Version, MP, RF Cal Date, CSC Version, CSC Model Spec, FFS Version, RC2 Version
*#1234# - SW Version and CSC Version
*#1111# - FTA SW Version
*#2222# - FTA HW Version

Wi-Fi and Bluetooth Test Codes:
*#526# - Wi-Fi Manual MFG Test Mode
*#232337# - BT RF Test Mode
Codes to launch various Factory Tests:
*#0*# - LCD test
*#0673# OR *#0289# - Melody test
*#0842# - Vibration test
*#2663# OR *#2664# - TM Command