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Here I have Samsung Galaxy Grand Prime and let me show you how to open testing menu on
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the following phone. So at the very beginning let's tap phones icon right here and let's use the secret code
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that allows you to open testing menu. So let's input the following code, star, hash, 7, 3, 5, 3, hash
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As you can see the testing menu just pops up in front of you. You can test some features from the following list, for example you can test the melody
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vibration, speaker, diming, camera, bluetooth and some other tests. Let me choose for example speaker
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You can test camera or light sensor. If you would like to go back let's use your back arrow and you can also open another testing menu
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Let's input the following code, star, hash, 0, star, hash and the testing menu just pops
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up in front of you. Here you can test some other things such as screen, you can test red, green light, blue
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You can also choose touch, sleep, sub key, front camera, back and some other tests
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Let's go back by using your back arrow and now you are in a normal mode
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