Vb.net SMS multiple recipcient

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VB

I already hunt google and any other forums but im still confused and cant find the right answer. Downloaded all possible files that might help but still no one works.

I know that this might be one of the MFAQ's but please do not refer me to any other else.

I am working with a text blast system. I was able to send a message to my phone number but the case now is different, I wanted to send a message to multiple contact numbers.

I have a hard understanding with the loop and I know or believe that this one require a loop process to complete.

Can anyone assist me this is the code for sending SMS.

Try
            With SerialPort1
                .Write("at" & vbCrLf)
                Threading.Thread.Sleep(1000)
                .Write("at+cmgf=1" & vbCrLf)
                Threading.Thread.Sleep(1000)
                .Write("at+cmgs=" & Chr(34) & txtNumber.Text & Chr(34) & vbCrLf & Chr(34))
                .Write(rtbMessage.Text & vbNewLine & vbNewLine & "Note: Please do not Reply." & Chr(26))
                Threading.Thread.Sleep(1000)
            End With

            MessageBox.Show("Message Sent!", "[ BMS - SMS Blast ] - Sending Complete", MessageBoxButtons.OK, MessageBoxIcon.Information)

        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try

What I have tried:

I have tried a lot specially some codes here but no one works.