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Here are the lists of secret codes for Android. Some of them will wipe out your valuable data, so be careful. Also, the codes might not work on all Android devices. I’ve tested these codes on my Nexus One but some didn’t respond.

*#06#
Display IMEI

*#*#8351#*#*
Enable Voice Dialer Logging

*#*#8350#*#*
Disable Voice Dialer Logging

**05*<PUK Code>*<enter a new pin>*<confirm the new pin>#
PUK Unlock (from emergency dial screen). This will simultaneously unlock the phone and set up the PIN code.

*#*#4636#*#*
This code can be used to get some interesting information about your phone and battery. It shows following 4 menus on screen:

* Phone information
* Battery information
* Battery history
* Usage statistics

*#*#7780#*#*
This performs a factory data reset, and will remove the following :

* Google account settings stored in your phone
* System and application data and settings
* Downloaded applications

It will NOT remove:

* Current system software and bundled applications
* SD card files e.g. photos, music files, etc.

* Once you give this code, you get a prompt screen asking you to click on “Reset phone” button. So you get a chance to cancel your operation.

*2767*3855#
Don’t try this one unless you’re sure. This code is used for factory format, and will remove all files and settings including the internal memory storage. It will also reinstall the firmware.

* 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.

*#*#34971539#*#*
This code is used to get information about the 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.

*#*#7594#*#*
This code can be used to change the “End Call / Power” button action in your phone. By 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.

* You can change this action using this code. You can enable direct power off on this button so you don’t need to waste your time in selecting the option.

*#*#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#*#*
*#*#526#*#*
*#*#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

Source : askvg

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