How do I access to a Function in a WCF WebServices

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VB

.NET

WC

WCFServices

Hi.
I made a WCF Service..that return a XML.
Well, Right Now I need that my WCF Service, return a pure JSON Response I mean: without XML headers or Tags

this is my code in service.vb:

' NOTE: You can use the "Rename" command on the context menu to change the class name "Service" in code, svc and config file together.
Imports System.Collections.Generic
Imports System.Linq
Imports System.Runtime.Serialization
Imports System.ServiceModel
Imports System.Text
Imports System.Data.SqlClient
Imports System.Configuration
Imports System.Web.Script.Serialization
Imports System.ServiceModel.Activation
Imports System.ServiceModel.Web
Imports System.Web.Script.Services


<AspNetCompatibilityRequirements(RequirementsMode:=AspNetCompatibilityRequirementsMode.Allowed)> _
Public Class Service
    Implements IService


    <WebInvoke(Method:="POST", ResponseFormat:=WebMessageFormat.Json)> _
    Public Function GetPolicyNuic(ByVal Prefijo As String, ByVal Folio As String, ByVal numVehiculo As String, ByVal TipoPoliza As String) As String Implements IService.GetPolicyNuic
        Dim DatosPoliza As SqlDataReader = Nothing
        Dim oConn As New dBTools()
        Dim oPolizas As Poliza
        oPolizas = New Poliza(Prefijo, Folio, numVehiculo, TipoPoliza)
        Return (New JavaScriptSerializer().Serialize(oPolizas))
    End Function
End Class 

In the IService.svc I have:

<ServiceContract()> _
Public Interface IService

    <OperationContract()> _
    Function GetPolicyNuic(ByVal Prefijo As String, ByVal Folio As String, ByVal numVehiculo As String, ByVal TipoPoliza As String) As String


    ' TODO: Add your service operations here

End Interface

Can someone tell me how I can access to my Functions?

Http://www.mySite.com/wss/WCFService/service.svc/GetPolicyNuic?Prefijo=PBB&Folio=53355&numVehiculo=1&TipoPoliza=A

This is the correct way to access to my Functions??

Thanks Regards.