Here is all of the info again Reddit
Ever want to use those special characters??? Well there are 255 of them and they are called alt codes. If you press alt and type the number here is what you will get "►" (this is 16). Probably will not use most of them, but have fun ☺☺☺... and by the way I have no idea what the red watermark is ~ hopefully nothing gross..
Did you know about this hidden menu on Samsung Galaxy smartphones?
Did you know about this hidden menu on Samsung Galaxy smartphones? You can use it to test different aspects of your phone like if you think your LCD/touchscreen is not working properly, LED indicator, vibration, cameras, etc. Samsung Galaxy galaxy s4 galaxy s6 galaxy s5