Android Hidden Codes

Open the default android dialer app and enter the codes as shown in the table below:

Code Description
##4636## Display information about Phone, Battery and Usage statistics
##7780## Restting your phone to factory state-Only deletes application data and applications
27673855# It’s a complete wiping of your mobile also it reinstalls the phones firmware
##34971539## Shows completes information about the camera
##7594## Changing the power button behavior-Enables direct poweroff once the code enabled
##273283255663282##* For a quick backup to all your media files
##197328640## Enabling test mode for service activity
##232339## OR ##526## Wireless Lan Tests
##232338## Displays Wi-Fi Mac-address
##1472365## For a quick GPS test
##1575## A Different type GPS test
##0283## Packet Loopback test
##0##* LCD display test
##0673## OR ##0289## Audio test
##0842## Vibration and Backlight test
##2663## Displays touch-screen version
##2664## Touch-Screen test
##0588## Proximity sensor test
##3264## Ram version
##232331## Bluetooth test
##7262626## Field test
##232337## Displays bluetooth device address
##8255##* For Google Talk service monitoring
##49862650468##* PDA, Phone, Hardware, RF Call Date firmware info
##1234## PDA and Phone firmware info
##1111## FTA Software version
##2222## FTA Hardware version
##44336## Displays Build time and change list number
#06# Displsys IMEI number
##8351##* Enables voice dialing logging mode
##8350## Disables voice dialing logging mode
##778 (+call) Brings up Epst menu

Source : xdadevelopers.com