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Message: <blockquote data-quote="FCB" data-source="post: 15248648" data-attributes="member: 225151">How to access the internal function of Galaxy S4 for testing the various hardware parts of your phone if it is working properly or not with the help of this secret code you can test lcd, vibration, camera, sensor (accelerometer sensor, proximity sensor, magnetic sensor), touch screen, speaker, sub key, etc... if you have any hardware problem with your Galaxy S4 you can identify with this code if it is working or not to do this follow the steps below.First of all open your keypad Then dial the secret code *#0*#. Now you get a screen with title LCD TEST and below that you have lots of option to test various hardware parts of your phone such as speaker, sensor, lcd, etcTo go back use right physical button while testing the touch, TSP Hovering you have to touch and mark all the squares back button does not work Other use full secret codes for android phone tested on Galaxy S4* #1234# to check software version of phone.*#12580*369# to check software and hardware information.*#0228# Battery status (ADC, RSSI reading)*#0011# Service Menu</blockquote>

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