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Here we've got Samsung Galaxy J4 Plus and let me show you all the secret codes for the
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following device. So at first let's open the phone dialer and we will start with the first code, the shortest one
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Simply enter asterisk pound 06 pound. And as you can see, this code will provide you with both email numbers and also serial
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number for your Samsung Galaxy J4 Plus. Click on OK to go back and now let's go to the second code, very useful one
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It's asterisk pound 06 pound. And as you can see, now we are in test mode
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Here you can test various features for your device. So we can start with, for example, speaker
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As you can see, it's working correctly. Then the receiver. It's also correct
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Then you can pick vibration. As you can hear, as I can feel, it's also working
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And then let's check display, for example. Red. It's definitely red. Green
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Working properly as well. Blue. And that's working correctly. And obviously you can pick some other tests
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So if you have any issues with some other features, simply enter this code and then
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test it. So let me go back to another code. Obviously from the other and now entering code, which is asterisk pound
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Asterisk pound 1234 pound. And here you can check your device version
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So for example, serial number of your model and all the other important features
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So let me go back. Now we will open service mode by entering code, which is asterisk pound 0011 pound
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And as you can see here is service mode and you can check basic information about your device
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Let's go to another code, which will be advanced service mode and the code is asterisk pound
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2683662 and pound at the end
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And here you've got the advanced service mode. Obviously if we will have our SIM cards inserted, we will be able to see some more info
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But as you can see, you can obviously back this mode. You can check key input, select something, help, check help and also Wi-Fi
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So let me go back. Now we will open the battery info and the code for that one is asterisk pound 0228 pound
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And here you've got the battery status, so you can check the network, the current value
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voltage level, level block, current age and all the others. So let me go back
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And another useful code is asterisk pound 0808 pound. And here you've got the USB settings, so you can pick the one that you need and then use
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your device with USB cable inserted. Let me go back. And now this is the last code, which will provide us with firmware version of this device
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and the code is asterisk pound 2663 pound. And that's it. As you can see here, you can check your firmware version
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You can also refresh Wi-Fi version and obviously you can find here truly advanced and useful
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information about your device. So that's basically all. These are all the codes for your Samsung Galaxy J4+
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