Smartphones have a good share of these as well, where they’re generally
known as secret codes. Most of the time, these numeric/symbolic
sequences allow you to access hidden menus, diagnostic tests, areas that
could change some of the most basic parameters of your device and
whatnot.
These secret codes, in fact, have not been exclusive to
smartphones, but have long been a part of the dumb-phones and then the
feature-phones before most major OEMs joined the smartphone bandwagon.
For those devices that run Android, certain codes are shared across the
board, and hence, can be used on a variety of devices.
How to Test Your Samsung Phone by Using Secret Code *#0*#
It is not difficult to check LCD (Display) of a cell phone or a tablet. LCDs being delicate tend to crack, leave blots or simply sop working. So if its is broken or cracked, you can see its broken manually.
Even if there is a blot on it, you can see it physically. But what if its looking good and still there is no graphics on the display? The problem may be either the LCD is faulty or there is some problem in the PCB. So how do we test it?
