User379860 postedFor android, you can use following code to ForceWifiOverCellular or ForceCellularOverWifi
```
using Android.Content;
using Android.Net;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SumOfEntrys.Droid
{
class ForceNetworkType
{
public static Context _context = Android.App.Application.Context;
/// <summary>
/// Forces the wifi over cellular
/// </summary>
public static void ForceWifiOverCellular()
{
ConnectivityManager connection_manager = (ConnectivityManager)_context.GetSystemService(Context.ConnectivityService);
NetworkRequest.Builder request = new NetworkRequest.Builder();
request.AddTransportType(TransportType.Wifi);
var callback = new ConnectivityManager.NetworkCallback();
connection_manager.RegisterNetworkCallback(request.Build(), new CustomNetworkAvailableCallBack());
}
/// <summary>
/// Forces the cellular over wifi.
/// </summary>
public static void ForceCellularOverWifi()
{
ConnectivityManager connection_manager = (ConnectivityManager)_context.GetSystemService(Context.ConnectivityService);
NetworkRequest.Builder request = new NetworkRequest.Builder();
request.AddTransportType(TransportType.Cellular);
connection_manager.RegisterNetworkCallback(request.Build(), new CustomNetworkAvailableCallBack());
}
}
/// <summary>
/// Custom network available call back.
/// </summary>
public class CustomNetworkAvailableCallBack : ConnectivityManager.NetworkCallback
{
public static Context _context = Android.App.Application.Context;
ConnectivityManager connection_manager = (ConnectivityManager)_context.GetSystemService(Context.ConnectivityService);
public override void OnAvailable(Network network)
{
//ConnectivityManager.SetProcessDefaultNetwork(network); //deprecated (but works even in Android P)
connection_manager.BindProcessToNetwork(network); //this works in Android P
}
}
}
```
For xamarin.form, you can create a dependence service to achieve it.
```
public interface IChangeNetworkSettings
{
void ForceWifiOverCellular();
void ForceCellularOverWifi();
}
```
In the android platform, you can achieve the interface.
```
[assembly: Dependency(typeof(ChangeNetworkSettingsService))]
namespace SumOfEntrys.Droid
{
public class ChangeNetworkSettingsService : IChangeNetworkSettings
{
public void ForceCellularOverWifi()
{
//throw new NotImplementedException();
ForceNetworkType.ForceCellularOverWifi();
}
public void ForceWifiOverCellular()
{
// throw new NotImplementedException();
ForceNetworkType.ForceWifiOverCellular();
}
}
}
```
But for iOS. it cannot be achieved, your app is sandboxed and can not access the Wifi manager's keychain, I cannot find a way to access it.
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