Give internet permission to Android app?

Question

Android

I'm making a client-server application that takes data from a WCF service. How do I allow a droid app on a real device to use the internet connection?
Option with indication in the manifest line

<uses-permission android:name="android.permission.INTERNET" />

for some reason it doesn't work.
By the way, the logic of the droid application is a button, when pressed, the WCF is accessed and the data should come. I also note that when you click on the button, the error "A system exception has occurred" falls out, but I still hope that this happens just because the droid application does not have access to the Internet.
On the emulator, the application works fine, but on a real device it does not want to.
What do you advise?

Answer 1

> The variant with indication of a line in the manifest for some reason does not work.
Show what permissions you allow access?
>A system exception has occurred"
Well, show the exception
> there is no Internet access for the droid application
Where does such confidence come from?