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Here I have Xiaomi Redmi Note 5A 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 your home screen. Let's open the phones application right here, this is the phone icon and let's input all
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secret code that you know. So let's start by using the Android testing menu
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So let's input star pound, star pound, 4636, hash, star, pound, star
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And as you can see this is the testing menu. Here you can choose some of the following options
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For example let's choose phone information when you can read all important statistics
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and information about your device. You can read the email number, signal strength, voice service, the data network type
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You can run a ping test or you can also choose more key in order to view SIM address book
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view fixed dialing numbers, view service dialing numbers, get PDPs or enable data connection
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Let's go back and choose battery info. Here you've got the statistics about your battery
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You can read such stuff as battery status, power plug, battery health or for example
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battery temperature. Let's go back, you may also choose user statistics and this is the list of all applications from
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your device and you can read the last time used and usage time
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Let's go back and choose the WiFi information. Here you can select the WiFi app when you can disable network, disconnect network, enable
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network, get configured networks or get connection info. You may also choose WiFi config when you can read the configured networks on your device
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Let's go back again, choose WiFi status and here you can read the statistics about your WiFi
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You can refresh them or run a ping test. Let's go back a couple of times in order to quit the Android testing menu and this time
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let me open the hardware test mode so the QC mode on the following phone
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Let's enter the following code, star pound, star pound, 64, 66, 3, pound star, pound star
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As you can see the QC mode pops up so here you can accomplish some hardware tests
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For example you can choose the software version. You can make sure that you have the right software and the right identifiers on your device
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Let me tap OK. Let's tap OK. Here you've got the SIM and SD card information if everything is alright
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Let's choose pass or error and other stuff. Let's go back a couple of times
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As you can see here you've got the test results. You can also test the colors, re-service, the GPS, Bluetooth, key, LED, front and back
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camera, call test, headset, radio and other stuff. You may also choose more key and for example choose the WiFi test tool
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Let's go back if you would like to quit the testing menu
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Of course all records will be cleared. Let's tap OK. This time let's open the calendar info so let's use star hash, star hash, 225 hash star
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hash star. And this is the calendar information so you can read some info about your calendar
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Let's go back. This time let's open the Google Play services mode so let's use star pound, star pound
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426, pound star, pound star. As you can see here you've got Google Play services
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Here you can choose ping, connect, disconnect or events. Let's go back and this time let me open the debug UI so let's use star pound, star pound
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759, pound star, pound star. As you can see debug UI just pops up
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Here you can change OEM mode. You can for example choose pings or select a few clients' IDs
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Let's go back and at the end let me show you how to check the email number by using the
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secret code. So let's use the following secret code. Star pound, 06 pound and as you can see the email number just pops up in front of you
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Let's tap OK to close this window. So you can close the phone's dialer
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Now the home screen pops up, you can use your device. Basically that's it
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