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Here I have Xiaomi Redmi 4A and let me show you how to use secret codes on the following device
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So, first of all let me start by using a home screen. Let me open the phone's dialer, so let's tap the phone icon and let's activate the following keypad
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Afterwards, let's use some secret codes that works on this device. So let's start by entering the engineer mode, let's input star hash, star hash, 64663, hash
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star, hash star. As you can see engineering mode just pops up
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Here you can accomplish some automatic tests to test the hardware of your device or you
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can for example just choose a single item test. And here you can test only some of the following features, for example the receiver
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You have to choose success or failed. You can for example choose speaker and test your speakers
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Let me tap success. Let's tap back. You may also see the test report, this is the report of the platform tests
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Let's go back. Here you've got some version information of your device
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The email number, the build fingerprint, the software version and other stuff
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You may also choose device view, right here. And that's it. If you would like to quit this mode, let's use your back arrow
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And now let me show you how to open the settings of the Xiaomi
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Let's use star hash, star hash, 3, 6, 2, 4, 5, hash star, hash star
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As you can see settings just pops up. Here you can for example choose the battery saver, the send feedback and other stuff
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Let me go back. And now let me show you how to open the testing menu
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So let's use the following code, star hash, star hash, 4, 6, 3, 6, hash star, hash star
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As you can see testing menu just pops up. Here you can select the phone information, when you can read such things as email number
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current network, mobile phone, the cell information, the roaming status and other stuff
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You may also choose more key, in order to view SIM address book, view fixed dialing
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numbers, view service dialing numbers and other stuff. Let's go back a couple of times
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And from the following menu let me choose the battery info. Here you can choose and read the battery information, such as the power plug, battery level or battery
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scale and other stuff. Let me go back and choose usage statistics
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Here you've got list of all apps and you can read such things as last time use or usage time
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Let me go back by using a back arrow and this time let me open the Wi-Fi information
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Here you've got Wi-Fi API, when you can disable network, disconnect network, enable network
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get configured networks or get connection info. Let's go back this time and let's choose Wi-Fi config and if you have some configured networks
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here you have the full specification of them. Let me go back and this time let me show you how to open the Wi-Fi status
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And here you've got statistics about your Wi-Fi. You can refresh them or you can run a ping test
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Let's go back a couple of times and let me quit the testing menu. This time let me open the calendar information, so let's use star hash, star hash, 225 hash
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star, hash star. As you can see the calendar info just pops up
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You may read the contacts, holidays, important and other stuff. Let's go back and let me open Google Play service mode
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Let's use star hash, star hash, 426 hash star, hash star
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As you can see Google Play services just pops up. Here you can choose ping, connect, disconnect or events. Excellent
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Let's go back and this time let me open debug UI, so let's use star hash, star hash, 759
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hash star, hash star. And the debug UI just pops up. Here you can view client's IDs, choose pings or for example change the OEM mode
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Let me go back and at the end let me show you how to open the email mode, so let's use
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star hash, 06 hash and the email mode just pops up. In order to close this window simply tap OK. Excellent
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Everything went well. Now you can go back and start using your device
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