Samsung Android Phone Secret Code

source: http://www.tiboys.com/489/samsung-android-phone-secret-code/

With this secret code you can access hidden phone information.*#*#4636#*#* Phone Information
*2767*3855# Hard Reset*
*#*#7780#*#* Factory Reset**
*#*#7594#*#* Change End Call/Power Option
*#*#197328640#*#* Service Mode
*#*#273283*255*663282*#*#* File Copy Screen (Backup Media Files)
*#*#526#*#* WLAN Test
*#*#232338#*#* Shows WiFi MAC address
*#*#1472365#*#* GPS Test
*#*#1575#*#* Another GPS test
*#*#232331#*#* Bluetooth test
*#*#232337#*# Shows Bluetooth device address
*#*#8255#*#* GTalk Service Monitor

Codes to launch various Factory Tests:

*#*#0283#*#* Packet Loopback
*#*#0*#*#* LCD test
*#*#0673#*#* Melody test
*#*#0842#*#* Device test (Vibration test and BackLight test)
*#*#2663#*#* Touch screen version
*#*#2664#*#* Touch screen test
*#*#0588#*#* Proximity sensor test
*#*#3264#*#* RAM version

Codes to get Firmware version information:

*#*#4986*2650468#*#* PDA, Phone, H/W, RFCallDate
*#*#1234#*#* PDA and Phone
*#*#1111#*#* FTA SW Version
*#*#2222#*#* FTA HW Version
*#*#44336#*#* PDA, Phone, CSC, Build Time, Changelist number

Note :
* Hard Reset to remove all files and settings in internal memory, or equal to reformat the firmware
* Warning! when it is direct push hard reset, there is no cancel option
* Factory Reset just delete the account, system & application settings