Android Secret Codes

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Every Mobile Operating System has some codes which the user can use simply by dialing codes. These codes are similar to USSD codes i.e when you enter they give immediate Response. 

Here's the list of codes for Android Mobiles (Some may or may not work.) :

Phone, Battery, Usage and Wi-Fi Information :
*#*#4636#*#*

Restore Factory Settings (Won't Ask for Confirmation. So use only if you need to Restore) :
*#*#7780#*#*

Format Phone (Use only if you need to Format) :
*2767*3855#

Launch service mode (You can run various tests and change the settings in the service mode):
*#*#197328640#*#*
 

Test WiFi :
*#*#232339#*#* or *#*#526#*#* or *#*#528#*#*

Display WiFi MAC address :
*#*#232338#*#*

GPS test :
*#*#1472365#*#*

Other GPS test :
*#*#1575#*#*
Bluetooth test :
*#*#232331#*#*

Display Bluetooth physic address :
*#*#232337#*#

Start Gtalk monitoring :
*#*#8255#*#*

PDA, Phone, H/W, RFCallDate :
*#*#4986*2650468#*#*

PDA and Phone :
*#*#1234#*#*

FTA Software version :
*#*#1111#*#*

FTA Hardware version :
*#*#2222#*#*

PDA, Phone, CSC :
*#*#44336#*#*
Packet Loopback :
*#*#0283#*#*

LCD test :
*#*#0*#*#*

Information About Camera Phone :

*#*#34971539#*#*

 
Melody test :
*#*#0673#*#* or *#*#0289#*#*

Change End Call/Power Button Behavior :

*#*#7594#*#*

RAM version :
*#*#3264#*#*

Device test such as vibration and lightness :
*#*#0842#*#*

Display touchscreen version :
*#*#2663#*#*

Touchscreen test :
*#*#2664#*#*

Distance sensor test :
*#*#0588#*#*

Display memory version :
*#*#3264#*#*