An example Java class file demonstrating how to create a mobile/cellular-only OkHttp based network.

MobileOnlyNetworkTest.java

public class MobileOnlyNetworkTest {
    private static final int TIMEOUT_SECONDS = 30;

    public Test(Context context) {
        Network network = getCellNetwork(context);
        if (network != null) {
            OkHttpClient client = getNetworkClient(network);
        }
    }
    
    private Network getCellNetwork(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        Network[] networks = cm.getAllNetworks();
        for (Network network: networks) {
            NetworkInfo ni = cm.getNetworkInfo(network);
            if (ConnectivityManager.TYPE_MOBILE == ni.getType()) {
                // Cell network!
                return network;
            }
        }

        return null;
    }

    private OkHttpClient getNetworkClient(Network bindNetwork) {
        OkHttpClient.Builder builder = new OkHttpClient.Builder()
                .connectTimeout(TIMEOUT_SECONDS, TimeUnit.SECONDS)
                .readTimeout(TIMEOUT_SECONDS, TimeUnit.SECONDS)
                .socketFactory(bindNetwork.getSocketFactory())
                .retryOnConnectionFailure(true)
                .followRedirects(true)
                .followSslRedirects(true);

        return builder.build();
    }

}