Android Secret Codes Know Your Android

Your Android smartphone has many interesting features that you may be unaware of.
Here are some codes that can help unveil the hidden features of your Android phone.(text in red are Code)

*#*#4636#*#*
This code brings you some interesting information about your phone and battery.

*#*#7780#*#*
This code makes a factory data reset. It resets the google account data in your phone and removes all the downloaded applications.

*2767*3855#
This code can be used for factory format . It removes all files and settings from the internal memory. It reinstalls the phone firmware.
Think twice before applying this code as there is no way to cancel it.

*#*#34971539#*#*
This code displays information about your phone camera.Do not select any option from the list as this can remove the camera firmware.

*#*#7594#*#*
This code can be used to configure the 'End Call/Power' button action. By default,long pressing the button shows a screen with options -Silent mode, Airplane mode and Power off.
You can configure direct 'power off' on this button.

*#*#273283*255*663282*#*#*
This code pops up a File copy screen where you can backup all your media files like Images,Sounds,Videos and Voice memo.

*#*#197328640#*#*
This code gives you access into the Service mode.

*#*#232338#*#*
Shows WiFi MAC address.

*#*#1472365#*#*
GPS test.

*#*#232331#*#*
Bluetooth test.

*#*#232337#*#
Shows Bluetooth device address.

*#*#8255#*#*
launches GTalk Service Monitor.

Various Factory Test codes: 

*#*#0283#*#*
Packet Loopback. 

*#*#0*#*#*
LCD test. 

*#*#0673#*#*
Melody test. 

*#*#0842#*#*
Vibration and BackLight test.

*#*#2664#*#*
Touch screen test. 

*#*#0588#*#*
Proximity sensor test. 

*#*#3264#*#*
RAM version.

All the codes are tested and found to be working.