Here is the List of Important Secret code for Android Users
1 ) code to know IMEI (International Mobile Equipment Identity) Number of your android phone
*#06#
2) code to know more about your camera in android phone
*#*#34971539#*#*
3) code to know WiFi MAC address
*#*#232338#*#*
4) To know about Your touch screen version
*#*#2663#*#*
5) Factory resetting code for android device
*#*#7780#*#*
6) code to know more About phone battery usage
*#*#4636#*#*
7) code to do audio test
*#*#0289#*#*
8) code to know about Android phone RAM version and all
*#*#3264#*#*
9) Code to disable voice dial mode in android device
*#*#8350#*#*
10) Code to enable voice dial mode in android device
*#*#8351#*#*
11) Code to backup of our all media files in android device.
*#*#273283*255*663282*#*#*
12) Code to know about software and hardware info.
*#12580*369#
13) Code to check battery status in android device
*#0228#
14)code to Android Phone Factory Format.
*2767*3855#