Android is one the most popular smartphone OS ever. Developers creates various kind of backdoor within the applications and operating systems. Through these backdoor any users who have sufficient knowledge can get into the system much deeper as compare to other users. As we all know Android is an open source operating system based on Linux Kernel and developed by Google. An Android operating system is most widely used in the world.
Android developers also creates many backdoor through which you can enter into the system and you can change settings. It is not meant to be used these backdoor for malicious intent because developers blocked some modes and these backdoor are the way or allow the users to enter into the system and let you become familiar to the system. In smartphone these backdoor are called "secret codes". These are the numeric/symbolic sequences which allow you to access system settings for several uses. So here we collect some Secret Hidden Codes for Android. May be some of them not work on specific device but you can try it if you can !

Note:- Some of these codes can reason for serious changes on your device assortment so please be advised run these codes on your own risk and don't play with them if you don't have sufficient knowledge about them.

Common Android Secret Codes

Codes	Functioning
##7780##	Factory restore setting Clear all application and data. Remove Google account setting. Remove System, application data and settings.
27673855#	Reinstall the phones firmware. Used for factory format. Remove all files and settings including the internal storage. Reinstall the firmware.
##197328640##	Enabling test mode for service activity. Used to enter into Service mode. You can run and change various tests and settings in the service mode.
##4636##	Phone basic information. Phone usage detail. Battery information.
##34971539##	Information about mobile camera. Get camera information. Note:- Please avoid update camera firmware option
##7594##	Changing the power button behavior. Enables the direct power off without asking for selecting any option (silent mode, Aeroplane and power off).
##273283255663282##*	Create backup to all your media files. Opens file copy screen where you can backup your media files like (images, videos and audios).
##8255##	For Google Talk service monitoring. Used to launch G Talk Service Monitor.
27674387264636*	Used to display product code.
*#0228#	Used to know Battery Status.
#12580369*	Software and Hardware Info.
*#32489#	Let you know Ciphering Info.
#2732832553282#	Data create menu.
#3282727336*#	Data usage status.
*#8736364#	OTA update menu.

WLAN, GPS and Bluetooth Test Android Secret Codes

Codes	Functioning
##526## ##528## ##232339##	WLAN Test.
##232338##	Displays/Shows WiFi MAC address.
##1472365##	For quick GPS test.
##1575##	Different type GPS test.
##232331##	Bluetooth test.
##232337#*#	Displays Bluetooth device address.

Firmware version information Android Secret codes

Codes	Functioning
##1111##	Let you know about FTA SW Version.
##2222##	FTA Hardware Version.
##49862650468##*	Firmware Info PDA, Phone, H/W, RFCallDate.
##1234##	PDA and Phone firmware info.
*#2263#	RF band selection
*#9090#	Diagnostic configuration.
*#7284#	USB 12C mode control.
*#872564#	USB logging control.
*#745#	RIL dump menu.
*#746#	Debug dump menu.
*#9900#	System dump mode.
##44336##	Shows Build time changelist number. PDA, Phone, CSC, Build Time, ChangeList number.
*#03#	NAND flash serial number.
*#3214789#	GCF mode status.

Factory Tests Android Secret Codes

Coding	Functioning
##0283##	Packet Loop-back test.
##0##*	LCD test.
##0673## ##0289##	Audio/Melody test.
##0842##	Vibration test and Back Light test Device test.
##2663##	Displays Touch screen version.
##2664##	Touch-Screen test.
##0588##	Proximity sensor test.
##3264##	RAM version.
*#0782#	Real time clock test.
*#0589#	Light sensor test.
*#7353#	Quick test menu.

PDA and Phone Android Secret Codes

Codes	Functioning
##7262626##	Field test.
*#06#	IMEI number.
##8351##	Enables voice dialing logging mode.
##8350##	Disables voice dialing logging mode.
05*#	Execute from Emergency dial screeen to unlock PUK code.
*#301279#	HSDPA HSUPA control menu.
*#7465625#	View phone lock status.

Other Android Secret Codes

Codes	Functioning
#0#	Galaxy S3 service menu.
##7764726	Motorola DROID hidden service menu. The default SPC password is six zeroes(000000).
1809#*990#	LG Optimus 2x hidden service menu. When prompted for a code enter six zeroes(000000).
3845#*920#	Lg Optimus 3D hidden service menu. When prompted for a code enter six zeroes(000000).

All the above given codes are tested and working fine but codes may not works single device. You can just try find which work or which not. Be alert while using them we are not responsible for any data loss or other problem. If you had any problem while trying must leave your comment.

Android Secret Codes For Smartphones: (Hidden Codes Chart)