Web Service Error Inner Exception: {"The remote server returned an error: NotFound"}

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Hi,
I have used this site a lot and you guys have saved my job couple of times. Thanks a lot, for the start.
I am not sure if this section to post this question. Its my first post here.
I have a simple ASP.NET Web Service (C# VS 2008) that reads a table from MS SQL Server 2005 and returns a string contain the XML rep of that table (acquired using WriteXML). When I run this Web Service is displays the string successfully in Explorer. But I am trying to call it from a Windows Phone App using httpwebresponce it raise the exception {"The remote server returned an error: NotFound."}
It does nothing (not working) when I call it using WebClient. Here is what my call from WP7 looks like:

...

 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri("http://localhost:3808/GatherService.asmx/TestMTD"));

 request.BeginGetResponse(new AsyncCallback(ReadCallback), request);
            return XMLtxt;
 }

        private void ReadCallback(IAsyncResult asynchronousResult)
        {
            HttpWebRequest request =
           (HttpWebRequest)asynchronousResult.AsyncState;
            HttpWebResponse response =
           (HttpWebResponse)request.EndGetResponse(asynchronousResult);
            using (StreamReader streamReader1 =
           new StreamReader(response.GetResponseStream()))
            {
                string resultString = streamReader1.ReadToEnd();
                XMLtxt = HttpUtility.HtmlEncode(resultString);
            }
        }