Hidden and Secret codes for Android Phones

Every people has their own secret, so do every phone OS has their own secret. Here is the collection of Android secret codes that I have collected form several websites. It has already for Android OS v1.5 (Cupcake) on Samsung Galaxy I7500.
 
By using these codes, it can also show many useful information about the phone, I haven't tested on the newer version of Android, so do it on your own risk FYI These codes have been obtained by decoding various .apk files present in the phone firmware.

DISCLAIMER: This information is intended for experienced users. It is not intended for basic users, hackers, or mobile thieves. Please do not try any of these if you are not familiar with mobile phones. We'll not be responsible for the use or misuse of this information, including loss of data or hardware damage. So use it at your own risk.

*#06#

Display IMEI 

*#*#8351#*#*

Voice Dialer Logging Enabled  

*#*#8350#*#*

Voice Dialer Logging Disabled

*#*#4636#*#*

Phone Setting 

*#*#7262626#*#*

FieldTest 

**05***#

PUK Unlock (from emergency dial screen)  

*#*#4636#*#*

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

• Battery information
• phone information
• Battery history
• 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.

PS: 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#
 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.
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.

*#*#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.

*#*#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.
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#*#* 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

NOTE: All above codes have been checked on Google Android phone Samsung Galaxy I7500 only but they should also work in other Google Android phones.
For detailed information you can find it in here

Free Voice Call using Android phone

As you know android phone become more popular recent days, and more application has built in this platform, the challenge to be creative has raised. One of the creative application that you must use is Voice Call using Voip (voice over IP). It will reduce your calling cost.
Here some excample of voip software than you can use to get Free voice call on your android phone
1. Sipgate










 2. google voice

Android phones with Google Voice can make and receive calls on a cheaper rate, but you still need a voice plan to make these calls. Using Google Voice, Android and Sipgate, you can call around that limitation and free.

Using Google Voice, you can call any number for free, but you are can't receive calls directly to your Google Voice number on your Android phone without a voice plan from your provider. By using Sipgate you can receive a free call, but can not make phone calls without adding money to your account. The combination of these two services, you will be able to make calls using Google Voice automatically redial your Sipgate number connects you to your intended recipient site, and we will do this using WiFi, 3G data, or EDGE, which means you can make calls with free.