Credit: Samsung/Mashable Australia
Samsung Android Phone General Test Mode has a range of functions, including an IR remote for Samsung TVs, to test the IR LED. Other functions include indicator LED, screen colours (reveals stuck or dead pixels), & sensor test.
Can’t say how many Samsung phones this works with, but I have tested it with a few, including Ace, S3, Note 3 & 4. The number of buttons depends on the capabilities of the phone. Some tests, such as “S-pen Hovering” are applicable only to particular models.
To try it, start the phone app, call up the keypad & type:
*#0*#
No spaces — type just as you would for a phone number.
More about Samsung Android Phone General Test Mode:
http://mashable.com/2014/10/27/samsung-galaxy-hidden-menu/
More useful codes at:
http://forum.xda-developers.com/galaxy-s3/general/galaxy-s3-useful-codes-to-test-hardware-t1896748
This item indicates that the above works with all recent Android phones:
http://www.redmondpie.com/hidden-android-secret-codes-for-samsung-htc-motorola-sony-lg-and-other-devices/
Thanks to Bryan for this item. /58 key codes Samsung Galaxy S3 SGS3 Samsung Android phone key general test basic current state of phone’s LCD touch-based smartphone Google hidden menu access dialing specific string of characters troubleshoot hardware issues check your phone's functionality tool first spotted Android Central Samsung Galaxy owners menu host of service checks hidden menu open dial pad enter *#0*# no spaces like any phone number this screen pop up numerous buttons run tests vibration RGB colors touch-screen sensitivity speaker output color checks could be useful single out dead pixels menu functions technical ordinary user perform sensor checks accelerometer sensor ensures photos aligned correctly on your phone displayed upright off-axis slanted test phone displays picture sensor button hidden menu screen display raw data your phone's sensors image test function touch-screen tracker traces path your finger speaker test plays song loudly testing /
