Some Useful Secret Codes For Android Devices 

*#06# - To display IMEI number.

*2767*3855# - To format your device (can be customized)

*#*#4636#*#* - This code will display your usage statistics and battery.

*#*#273282*255*663282*#*#* - This code helps you backup all media files in your mobile.

*#*#197328640#*#* - This code will send you to test mode, to test various functions of your mobile.

*#*#1111#*#* - This code will display FTA software version.

*#*#1234#*#* - This code will show PDA and firmware version.

*#*#0842#*#* - This code is used for backlight/vibration test.

*#*#2664#*#* - This code is used for testing the touchscreen.

*#*#34971539#*#* -  Will display detailed camera information.

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

*#07#-Mobile Radiation

*#0*#-Enter the service menu 

*#*#4636#*#*-Phone information, usage statistics and battery 

*#*#34971539#*#*-Detailed camera information 

*#*#273282*255*663282*#*#*-Immediate backup of all media files 

*#*#197328640#*#*-Enable test mode for service 

*#*#232339#*#*-Wireless LAN tests 

*#*#0842#*#*-Backlight/vibration test 

*#*#2664#*#*-Test the touch screen 

*#*#1111#*#*-FTA software version (1234 in the same code will give PDA and Firmware version) 

*#12580*369#-Software and hardware info 

*#9090#-Diagnostic configuration
 
*#872564#-USB logging control 

*#9900#-System dump mode 

*#301279#-HSDPA/HSUPA Control Menu

*#7465625#-View phone lock status 

*#*#7780#*#*-Reset the/data partition to factory state 

*2767*3855#-Format device to factory state (will delete everything on the phone) 

##7764726-Hidden service

*#*#4636#*#*-Phone information, usage statistics and battery 

*#*#34971539#*#*-Detailed camera information 

*#*#273282*255*663282*#*#*-Immediate backup of all media files 

*#*#197328640#*#*-Enable test mode for service 

*#*#0842#*#*-Backlight/vibration test 

*#*#2664#*#*-Test the touch screen 

*#*#1111#*#*-FTA software version (1234 in the same code will give PDA and Firmware version) 

*#12580*369#-Software and hardware info 

*#9090#-Diagnostic configuration 

*#872564#-USB logging control
 
*#9900#-System dump mode 
*#301279#-HSDPA/HSUPA Control Menu

*#7465625#-View phone lock status 

*#*#7780#*#*-Reset the/data partition to factory state 

*2767*3855#-Format device to factory state (will delete everything on the phone) 

##7764726-Hidden service menu for Motorola Droid

Thanks: forum DPCA