Why does it work fine on an android emulator but not on a real phone?

Question

Android

In Visual Studio 2017 in C# I make an application with Socket.IO.Client and run it in the emulator (Android 6.0 and 8.0) - everything works like clockwork.
I archive and install on the phone (Android 6.0) - Socket.IO.Client does not work.
Could you help me, tell me why?
MainActivity.cs

using Android.App;
using Android.Widget;
using Android.OS;
using Android.Support.V7.App;
using SocketIO.Client;
using System.Threading;

namespace App6
{
    [Activity(Label = "Программулина", Theme = "@style/AppTheme", MainLauncher = true, Icon ="@mipmap/exit")]
    public class MainActivity : AppCompatActivity
    {
        private Socket socket;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.activity_main);

            TextView info = FindViewById<TextView>(Resource.Id.textView1);
            info.Text = "Проверочка";
            //ДО СЮДА ВЫПОЛНЯЕТСЯ

            socket = IO.Socket("http://192.168.0.100:3333");
            socket.Connect();

            socket.On(Socket.EventConnect, (data) => {
                Print("Коннект", info);
                socket.Emit("add user", "Xamarin Android");
            });

            socket.On("message",(data)=>
            {
                Print(data[0].ToString(), info);
            });
        }
        private void Print (string text, TextView info)
        {
            RunOnUiThread(() => { info.Text = text; });
        }
    }
}

THE PROBLEM IS SOLVED by adding the manifest:

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

And why does it not ask permission to use the network during installation? It says "No special permissions required"

Answer 1

Debugger / logs in the teeth and watch.
There are a lot of options - from the lack of IP to the lack of permissions to access the application in the network.

Answer 2

Launched in the debugger, the phone asked for permission to install the application, I allowed it. The application is up and running.
Then I don't understand why the same application archived in apk and installed through the explorer does not work?