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Here I have Vivo V9 Pro 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 phone's dialer and let's enable the keypad here
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Let's use the first secret code so let me open the following testing menu
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Let's use here asterisk pound, asterisk pound, 4838 pound asterisk, pound asterisk
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As you can see Android testing menu just pops up, here you can open phone information and
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here you can read IE main number, you can run a ping test, you can read also signal
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strength, the current network data service and here you can also use more key to view
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contacts in the SIM, view fixed numbers or enable the data network connection
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Let's go back and here you can also use the user statistics, here you've got the list
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of all apps and you can use the last time used or usage time
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Let's go back, here you can also tap Wi-Fi information and here you can select Wi-Fi
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API, so here you can disable network, disconnect network, enable network or get connection info
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You can also open the Wi-Fi status and refresh or start or run a ping test or you can select
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Wi-Fi config to see configured networks of your device. Let's go back, let me quit this Android testing menu and it's time to open the second testing
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menu, so let's use asterisk pound, asterisk pound, 4636 pound asterisk, pound asterisk
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As you can see the following engineering test pops up, here you can open battery capacity
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test, so here you can check the battery info, battery temperature or other stuff, use back key
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Now let me open the next mode, let's enter the calendar info, so here you need to use
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the following code, asterisk pound, asterisk pound, 225 pound asterisk, pound asterisk
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As you can see the calendar info just pops up, let's go back. Now it's time to open the Google Play service, so let's use asterisk pound, asterisk pound
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426 pound asterisk, pound asterisk. As you can see Google Play service just pops up, so here you can use ping, connect, disconnect
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or events. Use back key by using the following key right here and now let me open the IMEI mode, so
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let's use asterisk pound, 06 pound and IMEI mode just pops up, tab OK
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Now let me use the advanced IMEI mode, let's use the asterisk pound, 09 pound and the following
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menu pops up, here you can use the barcodes and use other stuff
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