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*#*#4636#*#*
This code gives you some good basic information about your phone, such as battering information and usage statistics along with Phone and Wi-Fi information.
*#*#34971539#*#*
This code allows you to access information regarding the phone on your device, though keep in mind that this code is primarily used by technicians to work on both the camera firmware on the flashed OS, the SD card, and checking version dates and counts.
*#*#7594#*#*
If you'd like to customize your phone this will help you. This allows you to effect what the power button does when pressed. The default action is that a long press will bring up a menu to select a series of options. This code, when entered, will allow you to choose to have your phone directly power off on a long press of the power button itself.
*#*#273283*255*663282*#*#*
This allows a direct file copy of media on the phone, bringing you to a screen and menu that gives access to saved media files such as pictures and music so you can back them up without much issue. Deletion of media files from these menus, however, delete them from any backup they’re included in and make it so that it’s impossible to recover any media lost this way.
If you are having issues with your phone and wish to do some of the basic tests that technicians often run on devices to determine any direct problems, this list of codes will allow you to give your phone a good once over before you decide what your next step may be.
*#*#0*#*#* – This is simply a code used to test the capabilities of the LCD of your device.
*#*#0842#*#* – Considered a whole-device test, inputting this code will allow checking of your phone’s vibration and screen backlight.
*#*#2664#*#* – Use this code to look over your device’s touchscreen if there are issues with physical response to input.
*#*#0673#*#* – Used to test the sound capabilities of the audio chip, the melodic testing this code allows can help narrow down just about any software-based audio issues your device may be experiencing.
