How to send sms by ozeki sms gateway service

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C#

VB

i am using this code but is this i have to use a android app in mobile that is serive enable then it is create ip and user name and password then you have to install a desktop app in your computer and then use app code your own as i did in visual studio but problem is this that app not purchased then they use their by default sms some words like this is by send ozeki.com some this like this any one tell how and what is process they use and how can i make or guide any one what is way they ding all i understand all that a application in android device it is provided a link and same application company use that and send sms as i want exact

What I have tried:

Imports System
Imports System.IO
Imports System.Net
Imports System.Text
Imports System.Web

Public Class fMain

 Private Sub bSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bSend.Click
        Dim request As HttpWebRequest
        Dim response As HttpWebResponse = Nothing
        Dim url As String
        Dim username As String
        Dim password As String
        Dim host As String
        Dim originator As String

        Try

            host = "http://127.0.0.1:9501"
            originator = "06201234567"
            username = "admin"
            password = "abc123"

            url = host + "/api?action=sendmessage&" _
                     & "username=" & HttpUtility.UrlEncode(username) _
                     & "&password=" + HttpUtility.UrlEncode(password) _
                     & "&recipient=" + HttpUtility.UrlEncode(tbReceiver.Text) _
                     & "&messagetype=SMS:TEXT" _
                     & "&messagedata=" + HttpUtility.UrlEncode(tbMessage.Text) _
                     & "&originator=" + HttpUtility.UrlEncode(originator) _
                     & "&serviceprovider=GSMModem1" _
                     & "&responseformat=html"

            request = DirectCast(WebRequest.Create(url), HttpWebRequest)

            response = DirectCast(request.GetResponse(), HttpWebResponse)

            MessageBox.Show("Response: " & response.StatusDescription)

        Catch ex As Exception
        End Try
    End Sub
End Class