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Here I have HTC Desire 825 and let me show you how to use secret codes on the following device
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So at first let's unlock the screen, let's open the phone's dialer and now you can use
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all secret codes on this device. So let's start by entering the HTC function test
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Let's use star hash, star hash, three four, two four, hash star, hash star
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As you can see the HTC function test just pops up. Here you can tap accept the following operation and now you can perform a couple of tests
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The audio test, bluetooth test, charger test, LED test, wifi test, blacklight, button, flashlight
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vibrator test and other stuff. You may also select all and perform all of these tests
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You can unselect this. You can choose more right here and choose for example the battery test, factory data
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reset, save mode and software version. You can go back and let's go back a couple of times to open the phone's dialer
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Now it's time to enter the testing menu so let's use star hash, star hash, four six
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three six, hash star, hash star. As you can see testing menu just pops up
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Here you can navigate by tapping appropriate options. Let's choose the phone information for example
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And here you can read such stuff as email number, phone number, current network
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You can run ping test, you may also turn off the radio, turn on SMS over IMS, you can choose
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more key and select radio band, view sim address book, view fixed dialing numbers, view service
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dialing numbers, get PDP list or enable data connection. Let's go back and let me use the back arrow a couple of times
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Let's use usage statistics right here, the second option from the following list
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And here you've got all applications from your device and you may read the last time
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used or usage time. Let's go back again and choose Wi-Fi information
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Here you can select Wi-Fi API. When you can disable network, disconnect network, enable network, get configured networks or
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get connection info. Let's go back again and choose the Wi-Fi config and if you have some configured networks here
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you should find the full specification about them. Let me go back and let's choose the Wi-Fi status
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Here you can refresh all statistics about your Wi-Fi. You can also run a ping test from the following page
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Let's go back a couple of times to close the testing menu and it's time to enter the
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calendar info. So let's use star hash, star hash, 225, hash star, hash star
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And in some cases the calendar info may pops up on your screen
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If not you can go next and open the Google Play services
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So let's use star hash, star hash, 426, hash star, hash star
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As you may see Google Play services menu just pops up. Here you can choose ping, connect, disconnect events and read all specification
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Let's go back and let's open the debug UI. 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 view client's IDs
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You can change OEM mode and do other stuff. Let's go back and at the end let me show you how to check the email number by using a secret code
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So let's just simply use star hash, 06, hash and the email number just pops up
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So that's it. Let's tap OK and let's go back and use your device
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