Android Question Change DNS 3G Data ... configuring a temporary VPN


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I would like to know how to create a code for the phone to use a different DNS than the operator connection.

I found the app in playstore:

What it does is create a temporary VPN, and it uses a different DNS than that of the 4g telephone operator.

This solution has been of great help to me, since within my application today I have had clients that could not connect because an operator (orange) did not have the DNS correctly, and my clients could not connect to the server that uses my application.

I would like to add this functionality within the application, adding for example the google DNS in case of no connection to the server.
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