JSON with WCF in .NET 4.0

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ASP.NET

i have a WCF application which is supposed to return JSON.
my service contract is like below

[ServiceContract(Name = "MobileTV", Namespace = "MobileTVWCF")]
    public interface IMobileTVService
    {
        [OperationContract]
        string GetData(int value);

        [OperationContract]
        [WebGet(UriTemplate = "GetDataUsingDataContract/{deviceID}", ResponseFormat = WebMessageFormat.Json)]
        Customer GetDataUsingDataContract(int deviceID);


    }
    [DataContract]
    public class Customer
    {

        [DataMember]
        public int CustomerID { get; set; }
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public bool IsActive { get; set; }
        [DataMember]
        public string MobileNo { get; set; }
        [DataMember]
        public bool IsAuthenticated { get; set; }


    }

and my service Implemetation is as bellow
[AspNetCompatibilityRequirements(
RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class MobileTVService : IMobileTVService
{
public string GetData(int value)
{
return string.Format("You entered: {0}", value);
}
public Customer GetDataUsingDataContract(int deviceID)
{
Customer cust = new Customer();
SqlParameter[] paramsToStore = new SqlParameter[1];
paramsToStore[0] = new SqlParameter("@deviceID", SqlDbType.Int);
paramsToStore[0].Value = deviceID;
SqlDataReader sqlDataReaderObj = SqlHelper.ExecuteReader(@"Data Source=192.168.205.71\Development;Initial Catalog=PCTV;User ID=sa;Password=s@123", CommandType.StoredProcedure, StoredProcedures.GetCustomerDetails, paramsToStore);
if (sqlDataReaderObj.HasRows)
{
var customSqlDatareder = new CustomSqlDataReader(sqlDataReaderObj);
while (customSqlDatareder.Read())
{
cust.CustomerID = Convert.ToInt32(customSqlDatareder.GetString("intCustomerId"));
cust.MobileNo = customSqlDatareder.GetString("vcMobileNumber");
cust.Name = customSqlDatareder.GetString("Name");
cust.IsActive = customSqlDatareder.GetBoolean("boolISActive");
}
}
else
{
cust = null;
}
return cust;
}
}
i have done some setting in web.config in <system.servicemodel>

<system.serviceModel>
  <!--<serviceHostingEnvironment aspNetCompatibilityEnabled="True"></serviceHostingEnvironment>-->
  <services>

    <service behaviorConfiguration="MobileTVWCFTest.Service1Behavior"
      name="MobileTVWCFTest.MobileTVService">
      <endpoint address="" binding="wsHttpBinding" contract="MobileTVWCFTest.IMobileTVService" behaviorConfiguration="MobileTVWCFTest.Service1EndBehavior">
        <identity>
          <dns value="localhost" />
        </identity>
      </endpoint>
      <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
    </service>
  </services>
  <behaviors>
    <serviceBehaviors>
      <behavior name="MobileTVWCFTest.Service1Behavior">
        <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
        <serviceMetadata httpGetEnabled="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>
    <endpointBehaviors>

      <behavior name="MobileTVWCFTest.Service1EndBehavior">
        <webHttp/>
      </behavior>
    </endpointBehaviors>
  </behaviors>
</system.serviceModel>

can any one tell me that where i m doing wrong coz when i am running my code it throwing exception
The endpoint at 'http://localhost:1515/MobileTVService.svc' does not have a Binding with the None MessageVersion. 'System.ServiceModel.Description.WebHttpBehavior' is only intended for use with WebHttpBinding or similar bindings