Error when calling wcf service in Xamarin Forms

I'm trying to call my wcf service connected to my local database from an Android Emulator API 25 Nougat using xamarin forms and I get this error. I'm new to this so probably I'm missing some configuration.

Unhandled Exception:

System.ServiceModel.EndpointNotFoundException: System error. occurred

Web.config

<?xml version="1.0"?>
<configuration>

  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.6.1" />
    <httpRuntime targetFramework="4.6.1"/>
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <protocolMapping>
        <add binding="basicHttpsBinding" scheme="https" />
    </protocolMapping>    
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
  <system.webServer>

    <security>
      <requestFiltering>
        <fileExtensions allowUnlisted="true">
          <remove fileExtension="." />
          <add fileExtension="." allowed="true" />
        </fileExtensions>
      </requestFiltering>
    </security>
    <modules runAllManagedModulesForAllRequests="true"/>
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
    <directoryBrowse enabled="true"/>



  </system.webServer>

</configuration>

Service1.svc

    using System;
    using System.Collections.Generic;
    using System.Data;
    using System.Data.SqlClient;
    using System.Linq;
    using System.Runtime.Serialization;
    using System.ServiceModel;
    using System.ServiceModel.Web;
    using System.Text;

    namespace MyWcfService
    {
        // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
        // NOTE: In order to launch WCF Test Client for testing this service, please select Service1.svc or Service1.svc.cs at the Solution Explorer and start debugging.
        public class Service1 : IService1
        {

            private string conStr = "Data Source=(LocalDb)\\LocalDBDemo; Initial Catalog=MyDatabase; Integrated Security=true";

            public List<UserName> GetUserNames()
            {
                List<UserName> userList = new List<UserName>();
                SqlConnection connection = new SqlConnection(this.conStr);
                connection.Open();
                SqlCommand cmd = new SqlCommand("SELECT Names FROM UserNames", connection);
                cmd.CommandType = CommandType.Text;
                SqlDataReader sdr = cmd.ExecuteReader();

                while (sdr.Read())
                {
                    UserName name = new UserName();
                    name.Name = sdr["Names"].ToString();
                    userList.Add(name);
                }
                return userList.ToList();
            }

        }
    }

Iservice1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace MyWcfService
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface IService1
    {

        [OperationContract]
        [WebGet(UriTemplate = "GetUserNames")]
        List<UserName> GetUserNames();

    }
    [DataContract]



        public class UserName
        {
            string name;

            [DataMember]
            public string Name
            {
            get { return name; }
            set { name = value; }
         }            

        }

}

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace XAmwithWcf
{
    public partial class MainPage : ContentPage
    {
        ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
        public MainPage()
        {
            InitializeComponent();

        }

        async void MyButton_Clicked(object sender, EventArgs e) {

            var result = await client.GetUserNamesAsync();
            MyEntry.Text = result.ToString();
           await  client.CloseAsync();

        }
    }
}