Android mobile secret code

*#*#4636#*#*

 This code can be used to get some interesting information about your phone and battery. It shows following 4 menus on screen

1.  Phone information
2.  Battery information
3.  Battery history
4.  Usage statistics

  *#*#7780#*#*

 This code can be used for a factory data reset. It'll remove following things:
Google account settings stored in your phone
System and application data and settings
Downloaded applications

It'll NOT remove:
Current system software and bundled applications
SD card files e.g. photos, music files, etc.

 *2767*3855#

 Think before you give this code. This code is used for factory format. It'll remove all files and settings including the internal memory storage. It'll also reinstall the phone firmware.

*#*#34971539#*#*

 This code is used to get information about phone camera. It shows following 4 menus

1.  Update camera firmware in image (Don't try this option)
2.  Update camera firmware in SD card
3.  Get camera firmware version
4.  Get firmware update count

 *#*#7594#*#*

 This one is my favorite one. This code can be used to change the "End Call / Power" button action in your phone. Be default, if you long press the button, it shows a screen asking you to select any option from Silent mode, Airplane mode and Power off.

 *#*#273283*255*663282*#*#*

 This code opens a File copy screen where you can backup your media files e.g. Images, Sound, Video and Voice memo.

 *#*#197328640#*#*

 This code can be used to enter into Service mode. You can run various tests and change settings in the service mode.

WLAN, GPS and Bluetooth Test Codes:

*#*#232339#*#* OR *#*#526#*#* OR *#*#528#*#* - WLAN test (Use "Menu" button to start various tests)

*#*#232338#*#* - Shows WiFi MAC address

*#*#1472365#*#* - GPS test

*#*#1575#*#* - Another GPS test

*#*#232331#*#* - Bluetooth test

*#*#232337#*# - Shows Bluetooth device address

*#*#8255#*#*

This code can be used to launch GTalk Service Monitor.

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

Codes to launch various Factory Tests:

*#*#0283#*#* - Packet Loopback

*#*#0*#*#* - LCD test

*#*#0673#*#* OR *#*#0289#*#* - 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