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Here I have ZTE Axon 7 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 open the fonts dialer and let's start with the hardware
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test mode. So all you need to do is use this code Asterix 983 Asterix 0 pound
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As you can see the hardware test mode just pops up so here you can test all of the following features
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For example you can perform the battery test if everything is alright
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Let's tap pass. If something is wrong let's tap fail. So in my case let me just tap fail for this purpose
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Let's here also tap vibrator. You can also tap pass or fail
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You can also test other stuff such as the radio, key test, GPS, e-mail, sensor, camera
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NFC, hall test and other stuff as well. So that's it. This is the hardware test mode
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Really useful thing. Let's go back and now let's enter another secret code, another hidden mode
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Let's enter this code Asterix pound Asterix pound 4636 pound Asterix pound Asterix
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As you can see the testing menu just pops up. This is the Android testing menu so here you can choose phone information and you can read
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some stuff about your device, the current network, e-mail number, voice service
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You can also run here the ping test or you can use more key to select radio band, view
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sim 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 here choose user statistics and you can read the following information about
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your apps. Let's go back again. Here let's open the WiFi information
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You can choose the VLAN API to disable network, disconnect network, enable network, get configured
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networks or get connection info. Let's go back again. Here you can also choose the VLAN config to see configured networks of your device or
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you can choose here the status to read the statistics about your WiFi
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You can also refresh all stats or run a ping test. That's it
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Let's go back by using the back key to quit this Android testing menu and it's time to
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enter the calendar info. So let's use asterix pound, asterix pound, 225, pound asterix, pound asterix
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That's it. The calendar info just pops up so you can read here some information about your calendar
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Let's go back to quit this mode and now it's time to enter the Google Play services so
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let's use this code asterix pound, asterix pound, 426, pound asterix, pound asterix
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That's it. The Google Play services just pops up. Here you can read some information about your device
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You can switch from events to status as well. And to quit this mode let's use the back key
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And at the end let me show you how to easily get access to email information. All you need to do is use this code asterix pound, 06 pound and the email info just pops up
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You can also use the barcodes to these numbers. That's it. Tap OK and everything went well
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