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Here I am in Xiaomi Mi A2 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 unlock the screen, let's open the fonts dialer and activate
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the keypad. So now we need to use the first secret code, so at the very beginning let me open the hardware
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test mode. We need to use this code, asterix pound, asterix pound, 64663, pound asterix, pound asterix
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As you can see the hardware test just pops up, so here you can for example choose the
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software version, you can perform the SIM test, as you can see this is the SIM test
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Here you've got the software version and here you can see the result of the test
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You can also test the LED, speaker, color, for example let me show you the color test
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All you need to do is click to start the test and you can check out all colors of your screen
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Let me tap error to quit this. You can also use the speaker test, receiver, the head test, bluetooth, camera and other
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stuff as well. You can also use more key in order to see wifi test tools
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Let's go back to quit the hardware test mode, tap ok to clear all records and now you can
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open the android test mode by using the following code, asterix pound, asterix pound, 4636
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pound asterix, pound asterix. As you can see the android testing menu just pops up, so here you can choose phone information
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and read the following device specification, you can check the current network, the email
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number, signal strength, voice service and other stuff. You can also here run ping test or use more key in order to select radio band, view sim
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address book, view fixed dialing numbers, view service dialing numbers or enable data connection
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Let's go back, you can also use user statistics, here you've got the list of all apps from
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your device and you can read the last time used or usage time
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Let's go back, you can choose here also wifi information, here you can tap wifi happy and
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you can disable network, disconnect network, enable network, get configured networks or
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get connection info right here. You can also choose the wifi configuration right here and read the wifi status, here
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you've got all statistics and you may also refresh stats or run ping test
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Let's go back, let me quit the android testing menu and now it's time to open the calendar info
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So, we need to use this code, asterix pound, asterix pound, 225 pound asterix, pound asterix
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As you can see the calendar info just pops up, so here you can read about your calendar
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statistics and your calendar information. You can also go back and here you can open google play services by using this code, asterix
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pound, asterix pound, 426 pound asterix, pound asterix
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As you can see google play services just pops up, so here you can enable the ping, connect
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disconnect events or status. Let's go back and at the end you can also check out the email information by using this
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code, asterix pound, 06 pound and the email info just pops up in front of you
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Let's tap ok to confirm this window and basically everything went well
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