Hidden Secret Codes for Android

[Admin]

This information is intended for experienced users. It is not intended for basic users. Please do not try any of following methods if you are not familiar with Android OS.
*#*#4636#*#* This code can be used to get some interesting information about your phone and battery. It shows following 5 menus on screen:
-Phone information
-Battery information
-Battery history
-Usage statistics
-Wifi information

Menus might differ for different mobile phones, on others it might not even work at all.
*#*#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# Be careful with that 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:

-Update camera firmware in image (Don't try this option)
-Update camera firmware in SD card
-Get camera firmware version
-Get firmware update count

WARNING: Never use the first option otherwise your phone camera will stop working and you'll need to take your phone to service center to reinstall camera firmware.
*#*#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


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

[Admin]

*#06# IMEI number, some say that there are more than 15 characters (without the /** part), you are being listened to by some services.

[petrthomas]

Now these 15 characters for IMEI Number query isn't in active mode anymore.

[elyshh]

*#*#083#*#*
You can use this access google partner setup.