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Here I have Xiaomi Mi A1 and let me show you how to use secret codes on the following device
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So at the very beginning let's start by using a home screen. Find and select the phone's dialer by using this phone icon
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Let's activate the keypad and here you can use all secret codes that you know
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So let's start by using the hardware test. Let's use star hash, star hash, 64663, hash star, hash star
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As you can see hardware test just pops up. So here you can accomplish some test on your device
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For example you can check the version information, you can choose pass or fail
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You can also select and test the light sensor, proximity sensor. You can test the key light, the LCD black light, the receiver
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For example let me test the receiver. You can hear the male voice, the female voice
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Let's choose pass or fail. Let me go back. As you can see here I've got the results
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So you can also test the speaker
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And that's it. If you would like to go back and quit the hardware test let's use your back arrow
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And let me open the testing menu right now. So let's use star hash, star hash, 4636, hash star, hash star
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As you can see testing menu just pops up. Here you can navigate by tapping appropriate options
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So let's choose phone information at first. And you can read such things as email number, phone number, current network, signal strength
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voice service. You can also run a ping test. You may tap more key in order to select radio band, view sim address, book view, fix dialing
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numbers, view service dialing numbers and for example enable data connection. Let's go back
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You can also choose user statistics and here you've got statistics about your application
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You can read such things as last time use or usage time
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Let's go back and choose done information. Here you can use the WiFi app even you can disable network, disconnect network, enable
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network, get configure networks or get connection info. Let's go back and this time let's open the VLAN config
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If you have some configure networks here you should find the full specification about them
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Let's go back. Let's choose the VLAN status and here you can find the statistics about your WiFi
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You can refresh or start or run a ping test. Let's go back
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Let's quit the testing menu and this time let's open the calendar info
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So let's use star hash, star hash, 225, hash star, hash star and the calendar info just
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pops up so you can read here the holidays in Poland, the contacts and other stuff as well
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Let's go back and this time let's open the Google Play services mode
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So let's enter star hash, star hash, 426, hash star, hash star
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Google Play services just pops up. Here you can choose ping, connect, disconnect, events or status
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Let's use your back arrow and this time let's open the debug UI
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So let's use star hash, star hash, 759, hash star, hash star
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As you can see debug UI just pops up. Here you can read some important stuff
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For example the time of next alarm, the OEM mode, you can also change the OEM mode, you
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can view client's IDs and read other specifications. Let's go back. At the end let me show you how to check email number by using a secret code
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So let's use star hash, 06, hash and the email number just pops up
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Let's tap OK to close this. Let's go back and you can use your device right now
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