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Here I have Xiaomi Mi 8 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 pressing the power key, let's unlock the screen
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Here you need to find and select the phone's dialer. So here we've got the phone's dialer
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Now let's use the first secret code, so let me open the test menu, that's it mode
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Let's use this code, asterix pound, asterix pound, 64, 66, 3 pound asterix, pound asterix
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That's it, that's it mode pops up, so here you can check the hardware version of your device
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You can for example see the version info, tap pass if everything is correct
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You can see the sim card test, keyboard test and other stuff
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Here you've got the results, you can for example test the display, so you can test
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all colors of the screen. Alright and you can also test the headset, wifi, bluetooth, the sensors, the camera
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GPS and other stuff. Let's go back to quit this mode. Let's tap ok to this information and now it's time to enter the android testing menu
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so let's use this code, asterix pound, asterix pound, 46, 36, pound asterix, pound asterix
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As you can see the testing menu pops up, here you can choose phone information, when you
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can read the email number, signal strength, voice service. You can also here run the ping test or choose more in order to view sim address, view fixed
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dialing numbers or for example enable data connection. Let's go back, here you can also use phone information from the second sim card or you
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can choose the battery info. So here you've got the information about your battery such as the battery status, battery
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health or even the battery temperature. Let's go back, you can also choose here wifi information, here you can select wifi api
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when you can disable network, disconnect network, enable network, get configured networks or
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get connection info. You can also choose here wifi config and here you can configure all networks from your device
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Use back key again and here you can also tap wifi status, so here you've got the statistics
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with your wifi, you can refresh them or run a ping test
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Use back key again, twice and let me quit this testing menu by using back key one more time
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Now it's time to enter the calendar info, so let's use asterix pound, asterix pound
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two two five, pound asterix, pound asterix. As you can see calendar info pops up, so here you can read a couple of information from
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your calendar. Let's go back by using the back key and it's time right now to enter and see the Google
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Play service mode, so let's use this code, asterix pound, asterix pound, four two six
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pound asterix, pound asterix. That's it, Google Play services pops up, so here you can read ping, connect, disconnect
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events or status. Use back key again and at the end let me show you how to check the email number by using
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the secret code, so let's use this code, asterix pound, zero six, pound and the email
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information pops up on the screen. Tap OK to close this window and now you can go back and start using your device in a normal way
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