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How to connect Android to WiFi and network in the same time

I need Android to connect to both WiFi and the 4G Network in the same time.
As known, the default setting makes Android disconnect from the network once it connects to WiFi,
therefore it can't connect to both simultaneously.

There is an app in the Google app store called Speedify which does this:

But I would prefer to do it myself if possible. I checked on the net and some suggest to edit the 'ConnectivityServices.java' file;
however, I couldn't find yet the solution that works for sure.

Some suggest some editings in the ConnectivityServices.java file, but I couldn't find yet the solution that works for sure.

I would appreciate any help on how to achieve this.
 
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