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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.
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