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Here I've got Samsung Galaxy M21 and let me show you all the secret codes that you can
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use on this device. So at first you have to open your keypad and let's start with the shortest code which is
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asterisk pound 06 pound. And as you can see this one will provide you with both email numbers and also serial number
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assigned to your Samsung. So if you need to check the unique numbers just enter this code and then you will be
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provided with details. Afterwards just tap on OK and as you can see now you're back
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Now we will open the firmware version. To do it just enter asterisk pound 1234 and pound at the end
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And here you can check the firmware version, smoothly enter this code and here you've got
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module name and the details about the version. Enter code. It's actually the super useful one
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It is asterisk pound 0 asterisk pound. And here you can test your device
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Actually all the features starting with display, the receiver, speaker, sensor, vibration and
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so on. So let me show you how to perform such test. If you'd like to check for example display click on red and here you've got the color
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It is working properly. And green. Definitely fine as well. Blue. Also perfect
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Now receiver. As we all can hear it's working properly. Then you can also check the vibration
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You can hear, I can feel it is working more than fine
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And for example let me end with speaker test
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So this is it. It's working good. So now we can go back and end the test mode
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Another code that you can use in this phone, in this Samsung Galaxy M21 is the battery status
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So if you'd like to check the battery just enter asterisk pound 0 double to 8 pound
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And here you've got the battery status. So you can check the current value, voltage level, level block and so on
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So let me go back. And another code will allow you to change the USB settings
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To do it just enter asterisk pound 0808 and pound at the end
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And here you can change the USB settings just by marking the proper option
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So just pick the one that you'd like to apply and leave it this way
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And we have one more option, one more code which is asterisk pound 2663 pound
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And now you can check the advanced firmware version details and here you can also refresh
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the Wi-Fi if you want to. And actually this is it. So this is all
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These are all secret codes that you can use in your device, in your Samsung Galaxy M21
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I hope you enjoyed and use them as often as you need to. Thank you for watching. Please subscribe our channel and leave the thumbs up
